�??xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/"><channel><title>&#20122;&#27954;&#20013;&#25991;&#26080;&#30721;&#109;&#118;&#44;&#20122;&#27954;&#22269;&#20135;&#31934;&#21697;&#33258;&#22312;&#22312;&#32447;&#35266;&#30475;&#44;&#20122;&#27954;&#22269;&#20135;&#25104;&#20154;&#25163;&#26426;&#22312;&#32447;&#35266;&#30475;</title><link>http://www.tkk7.com/fine/category/20605.html</link><description /><language>zh-cn</language><lastBuildDate>Wed, 20 Oct 2010 07:01:27 GMT</lastBuildDate><pubDate>Wed, 20 Oct 2010 07:01:27 GMT</pubDate><ttl>60</ttl><item><title>Understanding JTA</title><link>http://www.tkk7.com/fine/archive/2010/10/19/335625.html</link><dc:creator>Peter Pan</dc:creator><author>Peter Pan</author><pubDate>Tue, 19 Oct 2010 11:49:00 GMT</pubDate><guid>http://www.tkk7.com/fine/archive/2010/10/19/335625.html</guid><description><![CDATA[
http://archive.devx.com/java/free/articles/dd_jta/jta-2.asp
Understanding JTA—the Java Transaction API (cont.)

Distributed Transactions and the Transaction Manager
As we stated previously, a distributed transaction is a transaction that accesses and updates data on two or more networked resources. These resources could consist of several different RDBMSs housed on a single sever, for example, Oracle, SQL Server, and Sybase; or they could include several instances of a single type of database residing on a number of different servers. In any case, a distributed transaction involves coordination among the various resource managers. This coordination is the function of the transaction manager.
The transaction manager is responsible for making the final decision either to commit or rollback any distributed transaction. A commit decision should lead to a successful transaction; rollback leaves the data in the database unaltered. JTA specifies standard Java interfaces between the transaction manager and the other components in a distributed transaction: the application, the application server, and the resource managers. This relationship is illustrated in the following diagram:
 
The numbered boxes around the transaction manager correspond to the three interface portions of JTA:
1—UserTransaction—The javax.transaction.UserTransaction interface provides the application the ability to control transaction boundaries programmatically. The javax.transaction.UserTransaction method starts a global transaction and associates the transaction with the calling thread.
2—Transaction Manager—The javax.transaction.TransactionManager interface allows the application server to control transaction boundaries on behalf of the application being managed.
3—XAResource—The javax.transaction.xa.XAResource interface is a Java mapping of the industry standard XA interface based on the X/Open CAE Specification (Distributed Transaction Processing: The XA Specification).
Notice that a critical link is support of the XAResource interface by the JDBC driver. The JDBC driver must support both normal JDBC interactions, through the application and/or the application server, as well as the XAResource portion of JTA.
Developers of code at the application level should not be concerned about the details of distributed transaction management. This is the job of the distributed transaction infrastructure—the application server, the transaction manager, and the JDBC driver. The only caveat for application code is that is should not invoke a method that would affect the boundaries of a transaction while the connection is in the scope of a distributed transaction. Specifically, an application should not call the Connection methods commit, rollback, and setAutoCommit(true) because they would interfere with the infrastructure's management of the distributed transaction.
The Distributed Transaction Process
The transaction manager is the primary component of the distributed transaction infrastructure; however, the JDBC driver and application server components should have the following characteristics:
�?The driver should implement the JDBC 2.0 API, including the Optional Package interfaces XADataSource and XAConnection, and the JTA interface XAResource. 
�?The application server should provide a DataSource class that is implemented to interact with the distributed transaction infrastructure and a connection pooling module (for improved performance).
The first step of the distributed transaction process is for the application to send a request for the transaction to the transaction manager. Although the final commit/rollback decision treats the transaction as a single logical unit, there can be many transaction branches involved. A transaction branch is associated with a request to each resource manager involved in the distributed transaction. Requests to three different RDBMSs, therefore, require three transaction branches. Each transaction branch must be committed or rolled back by the local resource manager. The transaction manager controls the boundaries of the transaction and is responsible for the final decision as to whether or not the total transaction should commit or rollback. This decision is made in two phases, called the Two-Phase Commit Protocol.
In the first phase, the transaction manager polls all of the resource managers (RDBMSs) involved in the distributed transaction to see if each one is ready to commit. If a resource manager cannot commit, it responds negatively and rolls back its particular part of the transaction so that data is not altered.
In the second phase, the transaction manager determines if any of the resource managers have responded negatively, and, if so, rolls back the whole transaction. If there are no negative responses, the translation manager commits the whole transaction, and returns the results to the application.
Developers of transaction manager code must be conversant with all three interfaces of JTA: UserTransaction, TransactionManager, and XAResource, which are described in the Sun JTA specification. The JDBC API Tutorial and Reference, Second Edition is also a useful reference. JDBC driver developers need only be concerned with the XAResource interface. This interface is a Java mapping of the industry standard X/Open XA protocol that allows a resource manager to participate in a transaction. The component of the driver connected with the XAResource interface is responsible for "translating" between the transaction manager and the resource manager. The following section provides examples of XAResource calls.
The JDBC Driver and XAResource
To simplify the explanation of XAResource, these examples illustrate how an application would use JTA when there is no application server and transaction manager involved. Basically, the application in these examples is also acting as application server and transaction manager. Most enterprises use transaction managers and application servers because they manage distributed transactions much more efficiently than an application can. By following these examples, however, an application developer can test the robustness of JTA support in a JDBC driver. Some examples may not work for a particular database because of inherent problems associated with that database.
Before using JTA, you must first implement an Xid class for identifying transactions (this would normally be done by the transaction manager). The Xid contains three elements: formatID, gtrid (global transaction ID), and bqual (branch qualifier ID).
The formatID is usually zero, meaning that you are using the OSI CCR (Open Systems Interconnection Commitment, Concurrency, and Recovery standard) for naming. If you are using another format, the formatID should be greater than zero. A value of -1 means that the Xid is null.
The gtrid and bqual can each contain up to 64 bytes of binary code to identify the global transaction and the branch transaction, respectively. The only requirement is that the gtrid and bqual taken together must be globally unique. Again, this can be achieved by using the naming rules specified in the OSI CCR.
The following example illustrates implementation of an Xid:

import javax.transaction.xa.*;
public class MyXid implements Xid
{
    protected int formatId;
    protected byte gtrid[];
    protected byte bqual[];

    public MyXid()
    {
    }

    public MyXid(int formatId, byte gtrid[], byte bqual[])
    {
        this.formatId = formatId;
        this.gtrid = gtrid;
        this.bqual = bqual;
    }


    public int getFormatId()
    {
        return formatId;
    }

    public byte[] getBranchQualifier()
    {
        return bqual;
    }

    public byte[] getGlobalTransactionId()
    {
        return gtrid;
    }

}
Second, you need to create a datasource for the database that you are using:

public DataSource getDataSource()
    throws SQLException
{
    SQLServerDataSource xaDS = new
        com.merant.datadirect.jdbcx.sqlserver.SQLServerDataSource();
    xaDS.setDataSourceName("SQLServer");
    xaDS.setServerName("server");
    xaDS.setPortNumber(1433);
    xaDS.setSelectMethod("cursor");
    return xaDS;
}
Example 1—This example uses the two-phase commit protocol to commit one transaction branch:

XADataSource xaDS;
XAConnection xaCon;
XAResource   xaRes;
Xid          xid;
Connection   con;
Statement    stmt;
int          ret;

xaDS = getDataSource();
xaCon = xaDS.getXAConnection("jdbc_user", "jdbc_password");
xaRes = xaCon.getXAResource();

con = xaCon.getConnection();
stmt = con.createStatement();

xid = new MyXid(100, new byte[]{0x01}, new byte[]{0x02});

try {
    xaRes.start(xid, XAResource.TMNOFLAGS);
    stmt.executeUpdate("insert into test_table values (100)");
    xaRes.end(xid, XAResource.TMSUCCESS);

    ret = xaRes.prepare(xid);
    if (ret == XAResource.XA_OK) {
        xaRes.commit(xid, false);
    }
}
catch (XAException e) {
    e.printStackTrace();
}
finally {
    stmt.close();
    con.close();
    xaCon.close();
}
Because the initialization code is the same or very similar for all the examples, only significantly different code is represented from this point forward.
Example 2—This example, similar to Example 1, illustrates a rollback:

xaRes.start(xid, XAResource.TMNOFLAGS);
stmt.executeUpdate("insert into test_table values (100)");
xaRes.end(xid, XAResource.TMSUCCESS);

ret = xaRes.prepare(xid);
if (ret == XAResource.XA_OK) {
    xaRes.rollback(xid);
}
Example 3—This example shows how a distributed transaction branch suspends, lets the same connection do a local transaction, and them resumes the branch later. The two-phase commit actions of distributed transaction do not affect the local transaction.

xid = new MyXid(100, new byte[]{0x01}, new byte[]{0x02});

xaRes.start(xid, XAResource.TMNOFLAGS);
stmt.executeUpdate("insert into test_table values (100)");
xaRes.end(xid, XAResource.TMSUSPEND);

// This update is done outside of transaction scope, so it
// is not affected by the XA rollback.
stmt.executeUpdate("insert into test_table2 values (111)");

xaRes.start(xid, XAResource.TMRESUME);
stmt.executeUpdate("insert into test_table values (200)");
xaRes.end(xid, XAResource.TMSUCCESS);

ret = xaRes.prepare(xid);
if (ret == XAResource.XA_OK) {
    xaRes.rollback(xid);
}
Example 4—This example illustrates how one XA resource can be shared among different transactions. Two transaction branches are created, but they do not belong to the same distributed transaction. JTA allows the XA resource to do a two-phase commit on the first branch even though the resource is still associated with the second branch.

xid1 = new MyXid(100, new byte[]{0x01}, new byte[]{0x02});
xid2 = new MyXid(100, new byte[]{0x11}, new byte[]{0x22});

xaRes.start(xid1, XAResource.TMNOFLAGS);
stmt.executeUpdate("insert into test_table1 values (100)");
xaRes.end(xid1, XAResource.TMSUCCESS);

xaRes.start(xid2, XAResource.TMNOFLAGS);

// Should allow XA resource to do two-phase commit on
// transaction 1 while associated to transaction 2
ret = xaRes.prepare(xid1);
if (ret == XAResource.XA_OK) {
    xaRes.commit(xid2, false);
}

stmt.executeUpdate("insert into test_table2 values (200)");
xaRes.end(xid2, XAResource.TMSUCCESS);

ret = xaRes.prepare(xid2);
if (ret == XAResource.XA_OK) {
    xaRes.rollback(xid2);
}
Example 5—This example illustrates how transaction branches on different connections can be joined as a single branch if they are connected to the same resource manager. This feature improves distributed transaction efficiency because it reduces the number of two-phase commit processes. Two XA connections to the same database server are created. Each connection creates its own XA resource, regular JDBC connection, and statement. Before the second XA resource starts a transaction branch, it checks to see if it uses the same resource manager as the first XA resource uses. If this is case, as in this example, it joins the first branch created on the first XA connection instead of creating a new branch. Later, the transaction branch can be prepared and committed using either XA resource.

xaDS = getDataSource();

xaCon1 = xaDS.getXAConnection("jdbc_user", "jdbc_password");
xaRes1 = xaCon1.getXAResource();
con1 = xaCon1.getConnection();
stmt1 = con1.createStatement();

xid1 = new MyXid(100, new byte[]{0x01}, new byte[]{0x02});
xaRes1.start(xid1, XAResource.TMNOFLAGS);
stmt1.executeUpdate("insert into test_table1 values (100)");
xaRes1.end(xid, XAResource.TMSUCCESS);

xaCon2 = xaDS.getXAConnection("jdbc_user", "jdbc_password");
xaRes2 = xaCon1.getXAResource();
con2 = xaCon1.getConnection();
stmt2 = con1.createStatement();

if (xaRes2.isSameRM(xaRes1)) {
    xaRes2.start(xid1, XAResource.TMJOIN);
    stmt2.executeUpdate("insert into test_table2 values (100)");
    xaRes2.end(xid1, XAResource.TMSUCCESS);
}
else {
    xid2 = new MyXid(100, new byte[]{0x01}, new byte[]{0x03});
    xaRes2.start(xid2, XAResource.TMNOFLAGS);
    stmt2.executeUpdate("insert into test_table2 values (100)");
    xaRes2.end(xid2, XAResource.TMSUCCESS);
    ret = xaRes2.prepare(xid2);
    if (ret == XAResource.XA_OK) {
        xaRes2.commit(xid2, false);
    }
}

ret = xaRes1.prepare(xid1);
if (ret == XAResource.XA_OK) {
    xaRes1.commit(xid1, false);
}
Example 6—This example shows how to recover prepared or heuristically completed transaction branches during failure recovery. It first tries to rollback each branch; if it fails, it tries to tell resource manager to discard knowledge about the transaction.

MyXid[] xids;

xids = xaRes.recover(XAResource.TMSTARTRSCAN | XAResource.TMENDRSCAN);
for (int i=0; xids!=null && i<xids.length; i++) {
    try {
        xaRes.rollback(xids[i]);
    }
    catch (XAException ex) {
        try {
            xaRes.forget(xids[i]);
        }
        catch (XAException ex1) {
            System.out.println("rollback/forget failed: " + ex1.errorCode);
            }
     }
}

<img src ="http://www.tkk7.com/fine/aggbug/335625.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/fine/" target="_blank">Peter Pan</a> 2010-10-19 19:49 <a href="http://www.tkk7.com/fine/archive/2010/10/19/335625.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>SOCKET CLOSE_WAIT  搜集</title><link>http://www.tkk7.com/fine/archive/2008/07/26/217709.html</link><dc:creator>Peter Pan</dc:creator><author>Peter Pan</author><pubDate>Sat, 26 Jul 2008 12:31:00 GMT</pubDate><guid>http://www.tkk7.com/fine/archive/2008/07/26/217709.html</guid><wfw:comment>http://www.tkk7.com/fine/comments/217709.html</wfw:comment><comments>http://www.tkk7.com/fine/archive/2008/07/26/217709.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.tkk7.com/fine/comments/commentRss/217709.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/fine/services/trackbacks/217709.html</trackback:ping><description><![CDATA[
		<span id="jf9jbnn"    class="hilite3">CLOSE_WAIT</span>�Q�TCP的癌症，TCP的朋友�?br /><br /><span id="t79hdl7"    class="hilite3">CLOSE_WAIT</span>状态的生成原因<br />首先我们知道�Q�如果我们的服务器程序APACHE处于<span id="dtvj7bb"    class="hilite3">CLOSE_WAIT</span>状态的话，说明套接字是被动关闭的！<br /><br />因�ؓ如果是CLIENT端主动断掉当前连接的话，那么双方关闭�q�个TCP�q�接共需要四个packet�Q?br /><br />      Client ---&gt;  FIN  ---&gt;  Server <br /><br />      Client &lt;---  ACK  &lt;---  Server <br /><br /> �q�时候Client端处于FIN_WAIT_2状态；而Server �E�序处于<span id="jh97pp9"    class="hilite3">CLOSE_WAIT</span>状态�?br /><br />      Client &lt;---  FIN  &lt;---  Server <br /><br />�q�时Server 发送FIN�l�Client�Q�Server ���q��为LAST_ACK状态�?br /><br />       Client ---&gt;  ACK  ---&gt;  Server <br /><br />Client回应了ACK�Q�那么Server 的套接字才会真正�|��ؓCLOSED状态�?br /><br />Server �E�序处于<span id="xlbh9dv"    class="hilite3">CLOSE_WAIT</span>状态，而不是LAST_ACK状态，说明�q�没有发FIN�l�Client�Q�那么可能是在关闭连接之前还有许多数据要发送或者其他事要做�Q�导致没有发�q�个FIN packet�?br /><br />通常来说�Q�一�?span class="hilite3">CLOSE_WAIT</span>会维持至��?个小时的旉���。如果有个流氓特地写了个�E�序�Q�给你造成一堆的<span id="r9vdj7v"    class="hilite3">CLOSE_WAIT</span>�Q�消�?br /><br />你的资源�Q�那么通常是等不到释放那一刻，�pȝ�����已�l�解军_��溃了�?br /><br />只能通过修改一下TCP/IP的参敎ͼ�来羃短这个时��_��修改tcp_keepalive_*�p�d��参数有助于解册���个问题�?br /><br /> <br /><br />proc/sys/net/ipv4/下各��的意义<br /><br />/proc/sys/net/ipv4/icmp_timeexceed_rate<br />�q�个在traceroute时导致著名的“Solaris middle star”。这个文件控制发送ICMP Time Exceeded消息的比率�?br />/proc/sys/net/ipv4/igmp_max_memberships<br />��L��上最多有多少个igmp (多播)套接字进行监听�?br />/proc/sys/net/ipv4/inet_peer_gc_maxtime<br />求 助: Add a little explanation about the inet peer storage? Minimum interval between garbage collection passes. This interval is in effect under low (or absent) memory pressure on the pool. Measured in jiffies.<br />/proc/sys/net/ipv4/inet_peer_gc_mintime<br />每一遍碎片收集之间的最���时间间隔。当内存压力比较大的时候，调整�q�个间隔很有效。以jiffies计�?br />/proc/sys/net/ipv4/inet_peer_maxttl<br />entries的最大生存期。在pool没有内存压力的情况下(比如�Q�pool中entries的数量很���的时�?�Q�未使用的entries�l�过一�D�|��间就会过期。以jiffies计�?br />/proc/sys/net/ipv4/inet_peer_minttl<br />entries的最���生存期。应该不���于汇聚端分片的生存期。当pool的大���不大于inet_peer_threshold�Ӟ���q�个最���生存期必须予以保证。以jiffies计�?br />/proc/sys/net/ipv4/inet_peer_threshold<br />The approximate size of the INET peer storage. Starting from this threshold entries will be thrown aggressively. This threshold also determines entries' time-to-live and time intervals between garbage collection passes. More entries, less time-to-live, less GC interval.<br />/proc/sys/net/ipv4/ip_autoconfig<br />�q�个文�g里面写着一个数字，表示��L��是否通过RARP、BOOTP、DHCP或者其它机制取得其IP配置。否则就�?�?br />/proc/sys/net/ipv4/ip_default_ttl<br />数据包的生存期。设�|��ؓ64是安全的。如果你的网�l�规模巨大就提高�q�个倹{��不要因为好玩而这么做——那样会产生有害的�\��q��路。实际上�Q�在很多情况下你要考虑能否减小�q�个倹{�?br />/proc/sys/net/ipv4/ip_dynaddr/proc/sys/net/ipv4/icmp_destunreach_rate<br /><br />如果你有一个动态地址的自动拨��h��口，���得讄���它。当你的自动拨号接口�Ȁ�zȝ��时候，本地所有没有收到答复的TCP套接字会重新�l�定到正���的地址上。这可以解决引发拨号的套接字本��n无法工作�Q�重试一�ơ却可以的问题�?br />/proc/sys/net/ipv4/ip_forward<br />内核是否转发数据包。缺省禁止�?br />/proc/sys/net/ipv4/ip_local_port_range<br />用于向外�q�接的端口范围。缺省情况下其实很小�Q?024�?999�?br />/proc/sys/net/ipv4/ip_no_pmtu_disc<br />如果你想���止“沿途MTU发现”就讄���它。“沿途MTU发现”是一�U�技术，可以在传输�\径上������出最大可能的MTU倹{��参见Cookbook一章中关于“沿途MTU发现”的内容�?br />/proc/sys/net/ipv4/ipfrag_high_thresh<br />用 于
IP分片汇聚的最大内存用量。分配了�q�么多字节的内存后，一旦用���，分片处理�E�序��׃��丢弃分片�?
When ipfrag_high_thresh bytes of memory is allocated for this purpose, the fragment handler will toss packets until ipfrag_low_thresh is reached.<br />/proc/sys/net/ipv4/ip_nonlocal_bind<br />如果你希望你的应用程序能够绑定到不属于本地网卡的地址上时�Q�设�|�这个选项。如果你的机器没有专�U�连�?甚至是动态连�?旉���常有用，即��你的�q�接断开�Q�你的服务也可以启动�q�绑定在一个指定的地址上�?br />/proc/sys/net/ipv4/ipfrag_low_thresh<br />用于IP分片汇聚的最���内存用量�?br />/proc/sys/net/ipv4/ipfrag_time<br />IP分片在内存中的保留时�?�U�数)�?br />/proc/sys/net/ipv4/tcp_abort_on_overflow<br />一个布���类型的标志�Q�控制着当有很多的连接请求时内核的行为。启用的话，如果服务���蝲�Q�内核将��d��地发送RST包�?br />/proc/sys/net/ipv4/tcp_fin_timeout<br />如 果
套接字由本端要求关闭�Q�这个参数决定了它保持在FIN-WAIT-2状态的旉���。对端可以出错�ƈ永远不关闭连接，甚至意外当机。缺省值是60�U��?
2.2 内核的通常值是180�U�，你可以按�q�个讄����Q�但要记住的是，即��你的机器是一个轻载的WEB服务器，也有因�ؓ大量的死套接字而内存溢出的�?
险，FIN- WAIT-2的危险性比FIN-WAIT-1要小�Q�因为它最多只能吃�?.5K内存�Q�但是它们的生存期长些。参�?
tcp_max_orphans�?br /><br />/proc/sys/net/ipv4/tcp_keepalive_time<br />当keepalive��L��的时候，TCP发送keepalive消息的频度。缺省是2���时�?br />/proc/sys/net/ipv4/tcp_keepalive_intvl<br />当探���没有确认时�Q�重新发送探���的频度。缺省是75�U��?br />/proc/sys/net/ipv4/tcp_keepalive_probes<br />在认定连接失效之前，发送多���个TCP的keepalive探测包。缺省值是9。这个��g��以tcp_keepalive_intvl之后军_��了，一个连接发送了keepalive之后可以有多���时间没有回应�?br />/proc/sys/net/ipv4/tcp_max_orphans<br />�p� 统
中最多有多少个TCP套接字不被关联到��M��一个用��h��件句柄上。如果超�q�这个数字，孤儿�q�接���即刻被复位�q�打印出警告信息。这个限制仅仅是��Z��防止���单的
DoS��d���Q�你�l�对不能�q�分依靠它或者�h为地减小�q�个��|��更应该增加这个�?如果增加了内存之�?�?
This limit exists only to prevent simple DoS attacks, you _must_ not rely on this or lower the limit artificially, but rather increase it (probably, after increasing installed memory), if network conditions require more than default value, and tune network services to linger and kill such states more aggressively. �?
我再�ơ提醒你�Q�每个孤儿套接字最多能够吃掉你64K不可交换的内存�?br />/proc/sys/net/ipv4/tcp_orphan_retries<br />本端试图关闭TCP�q�接之前重试多少�ơ。缺省值是7�Q�相当于50�U�~16分钟(取决于RTO)。如果你的机器是一个重载的WEB服务器，你应该考虑减低�q�个��|��因�ؓ�q�样的套接字会消耗很多重要的资源。参见tcp_max_orphans�?br />/proc/sys/net/ipv4/tcp_max_syn_backlog<br />變W�录
的那些尚未收到客��L�����认信息的连接请求的最大倹{��对于有128M内存的系�l�而言�Q�缺省值是1024�Q�小内存的系�l�则�?28。如果服务器不堪重负�Q?
试 试提高�q�个倹{��注意！如果你设�|�这个值大�?024�Q�最好同时调整include/net/tcp.h中的TCP_SYNQ_HSIZE�Q�以�?
证 TCP_SYNQ_HSIZE*16 ≤tcp_max_syn_backlo�Q�然后重新编译内核�?br />/proc/sys/net/ipv4/tcp_max_tw_buckets<br />�p� 统
同时保持timewait套接字的最大数量。如果超�q�这个数字，time-wait套接字将立刻被清除�ƈ打印警告信息。这个限制仅仅是��Z��防止����?
的 DoS��d���Q�你�l�对不能�q�分依靠它或者�h为地减小�q�个��|��如果�|�络实际需要大于缺省��|��更应该增加这个�?如果增加了内存之�?�?br />/proc/sys/net/ipv4/tcp_retrans_collapse<br />为兼�Ҏ��些糟�p�的打印������|�的“将错就错”选项。再�ơ发送时�Q�把数据包增大一些，来避免某些TCP协议栈的BUG�?br /><br />/proc/sys/net/ipv4/tcp_retries1<br />在认定出错�ƈ向网�l�层提交错误报告之前�Q�重试多���次。缺省设�|��ؓRFC规定的最�����|��3�Q�相当于3�U�~8分钟�Q�取决于RIO�Q��?br />/proc/sys/net/ipv4/tcp_retries2<br />在杀��M��个活动的TCP�q�接之前重试多少�ơ。RFC 1122规定�q�个限制应该长于100�U�。这个值太���了。缺省值是15�Q�相当于13~30分钟�Q�取决于RIO�Q��?br />/proc/sys/net/ipv4/tcp_rfc1337<br />�q�个开兛_��以启动对于在RFC1337中描�q�的“tcp的time-wait暗杀危机”问题的修复。启用后�Q�内核将丢弃那些发往time-wait状态TCP套接字的RST包。却省�ؓ0�?br />/proc/sys/net/ipv4/tcp_sack<br />特别针对丢失的数据包使用选择性ACK�Q�这��h��助于快速恢复�?br />/proc/sys/net/ipv4/tcp_stdurg<br />使用TCP紧急指针的��L��需求解释。因为绝大多��C��机采用BSD解释�Q�所以如果你在Linux上打开它，可能会媄响它与其它机器的正常通讯。缺省是FALSE�?br />/proc/sys/net/ipv4/tcp_syn_retries<br />在内核放弃徏立连接之前发送SYN包的数量�?br />/proc/sys/net/ipv4/tcp_synack_retries<br />��Z��打开对端的连接，内核需要发送一个SYN�q����带一个回应前面一个SYN的ACK。也���是所谓三�ơ握手中的第二次握手。这个设�|�决定了内核攑ּ��q�接之前发送SYN+ACK包的数量�?br />/proc/sys/net/ipv4/tcp_timestamps<br />旉���戛_��以避免序列号的卷�l�。一�?Gbps的链路肯定会遇到以前用过的序列号。时间戳能够让内核接受这�U�“异常”的数据包�?br />/proc/sys/net/ipv4/tcp_tw_recycle<br />能够更快地回收TIME-WAIT套接字。缺省值是1。除非有技术专家的�����和要求，否则不应修改�?br />/proc/sys/net/ipv4/tcp_window_scaling<br />一般来说TCP/IP允许�H�口���寸辑ֈ�65535字节。对于速度���实很高的网�l�而言�q�个值可能还是太���。这个选项允许讄���上G字节的窗口大���，有利于在带宽*延迟很大的环境中使用�?br />一旦内核认为它无法发包�Q�就会丢弃这个包�Q��ƈ向发包的��L��发送ICMP通知�?br />/proc/sys/net/ipv4/icmp_echo_ignore_all<br />�Ҏ��不要响应echo包。请不要讄���为缺省，它可能在你正被利用成为DoS��d��的蟩板时可能有用�?br />/proc/sys/net/ipv4/icmp_echo_ignore_broadcasts [Useful]<br />如果你ping子网的子�|�地址�Q�所有的机器都应该予以回应。这可能成�ؓ非常好用的拒�l�服务攻��d��兗���设�|��ؓ1来忽略这些子�|�广播消息�?br />/proc/sys/net/ipv4/icmp_echoreply_rate<br />讄���了向��L����L��回应echo��h��的比率�?br />/proc/sys/net/ipv4/icmp_ignore_bogus_error_responses<br />讄���它之后，可以忽略��q���l�中的那些声�U�回应地址是广播地址的主机生成的ICMP错误�?br />/proc/sys/net/ipv4/icmp_paramprob_rate<br />一个相对不很明���的ICMP消息�Q�用来回应IP头或TCP头损坏的异常数据包。你可以通过�q�个文�g控制消息的发送比率�?br /><br />================================================================<br /><br /> <a  target="_blank">http://skylove.study-area.org/blog/2006/07/linuxip_29.html</a><br /><br />tcp_syn_retries �Q�INTEGER<br />默认值是5<br />�?
于一个新�����接，内核要发送多���个 SYN �q�接��h��才决定放弃。不应该大于255�Q�默认值是5�Q�对应于180�U�左��x��间�?对于大负载而物理通信良好�?
�|�络而言,�q�个值偏�?可修改�ؓ2.�q�个��g��仅是针对对外的连�?对进来的�q�接,是由tcp_retries1 军_���?<br /><br />tcp_synack_retries �Q�INTEGER<br />默认值是5<br />�?
于远端的�q�接��h��SYN�Q�内�怼�发送SYN �Q� ACK数据报，以确认收��C��一个 SYN�q�接��h��包。这是所谓的三次握手
( threeway handshake)机制的第二个步骤。这里决定内核在攑ּ��q�接之前所送出的 SYN+ACK 数目。不应该大于255�Q�默认值是
5�Q�对应于180�U�左��x��间�?可以�Ҏ��上面的 tcp_syn_retries 来决定这个�?<br /><br />tcp_keepalive_time �Q�INTEGER<br />默认值是7200(2���时)<br />�?
keepalive打开的情况下�Q�TCP发送keepalive消息的频率�?�׃��目前�|�络��d���{�因�?造成了利用这个进行的��d��很频�J?曄���也有cu�?
朋友提到�q?说如�?边徏立了�q�接,然后不发送�Q何数据或者rst/fin消息,那么持箋的时间是不是���是2���时,�I����接攻
�? tcp_keepalive_time���是预防此情形的.我个人在做nat服务的时候的修改��gؓ1800�U?<br /><br />tcp_keepalive_probes�Q�INTEGER<br />默认值是9<br />TCP发送keepalive探测以确定该�q�接已经断开的次数�?注意:保持�q�接仅在SO_KEEPALIVE套接字选项被打开是才发�?�ơ数默认不需要修�?当然�Ҏ��情�Ş也可以适当地羃短此�?讄����?比较合�?<br /><br />tcp_keepalive_intvl�Q�INTEGER<br />默认��gؓ75<br />�?
���消息发送的频率�Q�乘以tcp_keepalive_probes���得到对于从开始探���以来没有响应的�q�接杀除的旉���。默认��gؓ75�U�，也就是没有活动的
�q�接���在大约11分钟以后���被丢弃�?对于普通应用来�?�q�个值有一些偏�?可以�Ҏ��需要改��?特别是web�c�L��务器需要改���该�?15是个比较合适的
�?<br /><br />tcp_retries1 �Q�INTEGER<br />默认值是3<br />攑ּ�回应一个TCP�q�接��h��前﹐需要进行多���次重试。RFC 规定最低的数值是3�H�这也是默认��|���Ҏ��RTO的值大�U�在3�U��? 8分钟之间�?注意:�q�个值同时还军_���q�入的syn�q�接)<br /><br />tcp_retries2 �Q�INTEGER<br />默认��gؓ15<br />在丢弃激�z?已徏立通讯状况)的TCP�q�接之前�H�需要进行多���次重试。默认��gؓ15�Q�根据RTO的值来军_���Q�相当于13-30分钟(RFC1122规定�Q�必���d���?00�U?.(�q�个值根据目前的�|�络讄���,可以适当地改��?我的�|�络内修改�ؓ�?)<br /><br />tcp_orphan_retries �Q�INTEGER<br />默认值是7<br />在近端丢弃TCP�q�接之前�H�要�q�行多少�ơ重试。默认值是7个﹐相当于�?0�U��? 16分钟�H�视 RTO 而定。如果您的系�l�是负蝲很大的web服务器﹐那么也许需要降低该��|���q�类 <span id="tplf7t9"    class="hilite1">socket</span>s 可能会耗费大量的资源。另外参的考 tcp_max_orphans �?事实上做NAT的时�?降低该��g��是好处显著的,我本人的�|�络环境中降低该��gؓ3)<br /><br />tcp_fin_timeout �Q�INTEGER<br />默认值是 60<br />对于本端断开�?span class="hilite1">socket</span>�q?
接，TCP保持在FIN-WAIT-2状态的旉���。对方可能会断开�q�接或一直不�l�束�q�接或不可预料的�q�程��M��。默认��gؓ 60 �U�。过��d��2.2版本的内
�怸�是�?80 �U�。您可以讄���该��|��但需要注意﹐如果您的机器�����载很重的web服务器﹐您可能要冒内存被大量无效数据报填满的风险�H�FIN-
WAIT-2 <span id="9dh7d99"    class="hilite1">socket</span>s 的危险性低于 FIN-WAIT-1 �H�因为它们最多只吃�?.5K 的内存﹐但是它们存在旉���更长。另外参考 tcp_max_orphans�?事实上做NAT的时�?降低该��g��是好处显著的,我本人的�|�络环境中降低该��gؓ30)<br /><br />tcp_max_tw_buckets �Q�INTEGER<br />默认值是180000<br />�p� 统在同时所处理的最大 timewait <span id="1bd99p1"    class="hilite1">socket</span>s 数目。如果超�q�此数的话﹐time-wait <span id="b99nz9d"    class="hilite1">socket</span> 会被立即砍除�q�且昄���警告信息。之所以要讑֮��q�个限制�H�纯�_��ؓ了抵御那些简单的 DoS ��d���H�千万不要�h为的降低�q�个限制�H�不�q�﹐如果�|�络条�g需要比默认值更多﹐则可以提高它(或许�q�要增加内存)�?事实上做NAT的时候最好可以适当地增加该�?<br /><br />tcp_tw_recycle �Q�BOOLEAN<br />默认值是0<br />打开快速 TIME-WAIT <span id="7rnbx7r"    class="hilite1">socket</span>s 回收。除非得到技术专家的�����或要求﹐请不要随意修改这个倹{�?做NAT的时候，�����打开�?<br /><br /> <br /><br />tcp_tw_reuse�Q�BOOLEAN<br />默认值是0<br />该文件表�C�是否允讔R��新应用处于TIME-WAIT状态的<span id="jdhx77j"    class="hilite1">socket</span>用于新的TCP�q�接(�q�个对快速重启动某些服务,而启动后提示端口已经被��用的情�Ş非常有帮�?<br /><br />tcp_max_orphans �Q�INTEGER<br />�~�省值是8192<br />�pȝ��所能处理不属于��M���q�程的TCP <span id="bpjjpb7"    class="hilite1">socket</span>s
最大数量。假如超�q�这个数量﹐那么不属于�Q何进�E�的�q�接会被立即reset�Q��ƈ同时昄���警告信息。之所以要讑֮��q�个限制�H�纯�_��ؓ了抵御那些简�?
的 DoS ��d���H�千万不要依赖这个或是�h为的降低�q�个限制(�q�个值Redhat AS版本中设�|��ؓ32768,但是很多防火墙修改的时�?�����该��g���?
�?000)<br /><br />tcp_abort_on_overflow �Q�BOOLEAN<br />�~�省值是0<br />当守护进�E�太忙而不能接受新的连
接，���p���Ҏ��发送reset消息�Q�默认值是false。这意味着当溢出的原因是因��Z��个偶然的猝发�Q�那么连接将恢复状态。只有在你确信守护进�E�真的不能完
成连接请求时才打开该选项�Q�该选项会媄响客��L��使用�?对待已经满蝲的sendmail,apache�q�类服务的时�?�q�个可以很快让客��L���l�止�q�接,�?
以给予服务程序处理已有连接的�~�冲��Z��,所以很多防火墙上推荐打开�?<br /><br />tcp_syncookies �Q�BOOLEAN<br />默认值是0<br />只有在内核编译时选择了CONFIG_SYNCOOKIES时才会发生作用。当出现syn�{�候队列出现溢出时象对方发送syncookies。目的是��Z��防止syn flood��d���?br />注意�Q�该选项千万不能用于那些没有收到��d��的高负蝲服务器，如果在日志中出现synflood消息�Q�但是调查发现没有收到synflood��d���Q�而是合法用户的连接负载过高的原因�Q�你应该调整其它参数来提高服务器性能。参�?<br />tcp_max_syn_backlog<br />tcp_synack_retries<br />tcp_abort_on_overflow<br />syncookie
严重的违背TCP协议�Q�不允许使用TCP扩展�Q�可能对某些服务��D��严重的性能影响(如SMTP转发)�?注意,该实��C��BSD上面使用�?
tcp proxy一�?是违反了RFC中关于tcp�q�接的三�ơ握手实现的,但是对于防�Msyn-flood的确很有�?)<br /><br />tcp_stdurg �Q�BOOLEAN<br />默认��gؓ0<br />使用 TCP urg pointer 字段中的��L����h��解释功能。大部䆾的主机都使用老旧的 BSD解释�Q�因此如果您在 Linux 打开它﹐或会��D��不能和它们正���沟通�?br /><br /> <br /><br />tcp_max_syn_backlog �Q�INTEGER<br />�?
于那些依然还未获得客��L�����认的连接请求﹐需要保存在队列中最大数目。对于超�q��?28Mb 内存的系�l�﹐默认值是 1024 �H�低于�?28Mb 的则
为�?28。如果服务器�l�常出现�q�蝲�H�可以尝试增加这个数字。警告﹗假如您将此��D��为大于�?024�H�最好修改 include/net/tcp.h �?
面的 TCP_SYNQ_HSIZE �H�以保持 TCP_SYNQ_HSIZE*16&lt;=tcp_max_syn_backlog �H��ƈ且编�q�核�?
之内�?SYN Flood��d��利用TCP协议散布握手的缺��P��伪造虚假源IP地址发送大量TCP-SYN半打开�q�接到目标系�l�，最�l�导致目标系�l?span class="hilite1">Socket</span>�?
列资源耗 尽而无法接受新的连接。�ؓ了应付这�U�攻击，��C��Unix�pȝ��中普遍采用多�q�接队列处理的方式来�~�冲(而不是解�?�q�种��d���Q�是用一个基本队列处
理正常的完 全�q�接应用(Connect()和Accept() )�Q�是用另一个队列单独存攑֍�打开�q�接。这�U�双队列处理方式和其他一些系�l�内核措�?�?
如Syn-Cookies/Caches)联合应用�Ӟ��能够比较有效的缓解小规模的SYN Flood��d��(事实证明&lt;1000p/s)加大SYN
队列长度可以容纳更多�{�待�q�接的网�l�连接数�Q�所以对Server来说可以考虑增大该�?)<br /><br />tcp_window_scaling �Q�INTEGER<br />�~�省��gؓ1<br />该 文
件表�C�����|�tcp/ip会话的滑动窗口大���是否可变。参数��gؓ布尔��|���?时表�C�可变，�?时表�C�Z��可变。tcp/ip通常使用的窗口最大可�?
刊W?5535 字节�Q�对于高速网�l�，该值可能太���，�q�时候如果启用了该功能，可以使tcp/ip滑动�H�口大小增大��C��数量�U�，从而提高数据传输的能力
(RFC 1323)。（�Ҏ��通地百M�|�络而言�Q�关闭会降低开销�Q�所以如果不是高速网�l�，可以考虑讄����?�Q?br /><br />tcp_timestamps �Q�BOOLEAN<br />�~�省��gؓ1<br />Timestamps �?
在其它一些东西中�H�可以防范那些伪造的 sequence ��L��。一�?G的宽带线路或�怼�重遇到带 out-of-line数值的�?
sequence ��L��(假如它是�׃��上次产生�?。Timestamp 会让它知道这是个 '旧封�?�?该文件表�C�是否启用以一�U�比���时重发更精���的
�Ҏ���Q�RFC 1323�Q�来启用对 RTT 的计���；��Z��实现更好的性能应该启用�q�个选项�?<br /><br />tcp_sack �Q�BOOLEAN<br />�~�省��gؓ1<br />使 用 Selective ACK�H?
它可以用来查扄���定的遗失的数据报--- 因此有助于快速恢复状态。该文�g表示是否启用有选择的应�{?
�Q�Selective Acknowledgment�Q�，�q�可以通过有选择地应�{��ؕ序接收到的报文来提高性能�Q�这样可以让发送者只发送丢��q��报文
�D�）�?对于�q�域�|�通信来说�q�个选项应该启用�Q�但是这会增加对 CPU 的占用�?<br /><br />tcp_fack �Q�BOOLEAN<br />�~�省��gؓ1<br />打开FACK拥塞避免和快速重传功能�?注意�Q�当tcp_sack讄����?的时候，�q�个值即使设�|��ؓ1也无�?<br /><br />tcp_dsack �Q�BOOLEAN<br />�~�省��gؓ1<br />允许TCP发�?两个完全相同"的SACK�?br /><br />tcp_ecn �Q�BOOLEAN<br />�~�省��gؓ0<br />打开TCP的直接拥塞通告功能�?br /><br />tcp_reordering �Q�INTEGER<br />默认值是3<br />TCP���中重排序的数据报最大数量 。�?一般有看到推荐把这个数值略微调整大一�?比如5)<br /><br />tcp_retrans_collapse �Q�BOOLEAN<br />�~�省��gؓ1<br />对于某些有bug的打印机提供针对其bug的兼�Ҏ���?一般不需要这个支�?可以关闭�?<br /><br />tcp_wmem(3个INTEGER变量)�Q� min, default, max<br />min�Q��ؓTCP <span id="b979p1f"    class="hilite1">socket</span>预留用于发送缓冲的内存最���倹{��每个tcp <span id="7j9rt99"    class="hilite1">socket</span>都可以在�����以后都可以��用它。默认��gؓ4096(4K)�?br /><br />default�Q��ؓTCP <span id="ht7fhrb"    class="hilite1">socket</span>预留用于发送缓冲的内存数量�Q�默认情况下该��g��影响其它协议使用的net.core.wmem_default ��|��一般要低于net.core.wmem_default的倹{��默认��gؓ16384(16K)�?br /><br />max: 用于TCP <span id="9flvrrz"    class="hilite1">socket</span>�?
送缓冲的内存最大倹{��该��g��会媄响net.core.wmem_max�Q?静�?选择参数SO_SNDBUF则不受该值媄响。默认��gؓ
131072(128K)。（对于服务器而言�Q�增加这个参数的值对于发送数据很有帮�?在我的网�l�环境中,修改��Z��
51200 131072 204800�Q?br /><br />tcp_rmem (3个INTEGER变量)�Q� min, default, max<br />min�Q��ؓTCP <span id="7jv797d"    class="hilite1">socket</span>预留用于接收�~�冲的内存数量，即��在内存出现紧张情况下tcp <span id="lh7v999"    class="hilite1">socket</span>都至���会有这么多数量的内存用于接收缓�Ԍ��默认��gؓ8K�?br /><br />default�Q��ؓTCP <span id="7hj979l"    class="hilite1">socket</span>�?
留用于接收缓冲的内存数量�Q�默认情况下该值媄响其它协议��用的 net.core.wmem_default 倹{��该值决定了�?
tcp_adv_win_scale、tcp_app_win和tcp_app_win=0默认值情况下�Q�TCP�H�口大小�?5535。默认��gؓ
87380<br /><br />max�Q�用于TCP <span id="vz9thz9"    class="hilite1">socket</span>接收�~�冲的内存最大倹{��该��g��
会媄响 net.core.wmem_max�Q?静�?选择参数 SO_SNDBUF则不受该值媄响。默认��gؓ 128K。默认��gؓ
87380*2 bytes。（可以看出�Q?max的设�|�最好是default的两�?对于NAT来说主要该增加它,我的�|�络�?
为�?1200 131072 204800�Q?br /><br />tcp_mem(3个INTEGER变量)�Q�low, pressure, high<br />low�Q�当TCP使用了低于该值的内存��面数时�Q�TCP不会考虑释放内存�?理想情况下，�q�个值应与指定给 tcp_wmem 的第 2 个值相匚w�� - �q�第 2 个��D��明，最大页面大���乘以最大�ƈ发请求数除以��大����?131072 * 300 / 4096)。�?<br /><br />pressure�Q?
当TCP使用了超�q�该值的内存��面数量�Ӟ��TCP试图�E�_��其内存��用，�q�入pressure模式�Q�当内存消耗低于low值时则退出pressure�?
态�?理想情况下这个值应该是 TCP 可以使用的�ȝ��冲区大小的最大值�?204800 * 300 / 4096)。�?<br /><br />high�Q�允许所有tcp <span id="jvh9b77"    class="hilite1">socket</span>s
用于排队�~�冲数据报的��面量�?如果���过�q�个��|��TCP �q�接���被拒绝�Q�这���是��Z��么不要��o其过于保守�?512000 * 300 / 4096) �?
原因了。 在�q�种情况下，提供的�h值很大，它能处理很多�q�接�Q�是所预期的�?.5 倍；或者��现有�q�接能够传输 2.5 倍的数据。 我的网�l�里�?
192000 300000 732000)<br /><br />一般情况下�q�些值是在系�l�启动时�Ҏ���pȝ��内存数量计算得到的�?br /><br />tcp_app_win : INTEGER<br />默认值是31<br />保留max(window/2^tcp_app_win, mss)数量的窗口由于应用缓册Ӏ�当�?时表�C�Z��需要缓册Ӏ?br /><br />tcp_adv_win_scale : INTEGER<br />默认��gؓ2<br />计算�~�冲开销bytes/2^tcp_adv_win_scale(如果tcp_adv_win_scale &gt; 0)或者bytes-bytes/2^(-tcp_adv_win_scale)(如果tcp_adv_win_scale &lt;= 0�Q��?br /><br /> <br /><br />tcp_rfc1337 :BOOLEAN<br />�~�省��gؓ0<br />�q�个开兛_��以启动对于在RFC1337中描�q�的"tcp 的time-wait暗杀危机"问题的修复。启用后�Q�内核将丢弃那些发往time-wait状态TCP套接字的RST �?<br /><br /> <br /><br />tcp_low_latency : BOOLEAN<br />�~�省��gؓ0<br />允许 TCP/IP 栈适应在高吞吐量情况下低�g时的情况�Q�这个选项一般情形是的禁用�?但在构徏Beowulf 集群的时�?打开它很有帮�?<br /><br /> <br /><br />tcp_westwood :BOOLEAN<br />�~�省��gؓ0<br />启用发送者端的拥塞控制算法，它可以维护对吞吐量的评估�Q��ƈ试图对带宽的整体利用情况�q�行优化�Q�对于 WAN 通信来说应该启用�q�个选项�?br /><br /> <br /><br />tcp_bic :BOOLEAN<br />�~�省��gؓ0<br />为快速长距离�|�络启用 Binary Increase Congestion�Q�这样可以更好地利用以 GB 速度�q�行操作的链接；对于 WAN 通信应该启用�q�个选项�?br /><br /> <br /><br /> <br /><br /> <br /><br /># 以下一�D��ؓ抉|��syn flood��d���Q���^时徏议关�?br /><br />sysctl -w net.ipv4.tcp_syncookies=1              # tcp syncookie�Q�默认关�?br /><br />sysctl -w net.ipv4.tcp_max_syn_backlog=1280   # syn队列�Q�默�?024�Q?gt; 1280可能工作不稳定，需要修改内核源码参�?br /><br />sysctl -w net.ipv4.tcp_synack_retries=2             # syn-ack握手状态重试次敎ͼ�默认5�Q�遭受syn-flood��d��时改�?�?<br /><br />sysctl -w net.ipv4.tcp_syn_retries=2                  # 外向syn握手重试�ơ数�Q�默�?<br /><br /> <br /><br /> <br /><br /># 以下一�D��ؓ应对tcp connect�q�接耗尽��d���Q�如果开启iptables connlimit模块可禁�?br /><br /># 有严重连接性能影响和不�E�_��因素�Q�慎�?br /><br />sysctl -w tcp_tw_recycle=1                           # 默认0�Q�tw快速回�?br /><br />sysctl -w tcp_tw_reuse=1                             # 默认0�Q�tw重用<br /><br />sysctl -w tcp_keepalive_intvl=60                    # 默认75�Q�tcp keeplive探测轮询旉���<br /><br />sysctl -w tcp_keepalive_probes=3                  # 默认9�Q�tcp keeplive探测轮询�ơ数<br /><br />sysctl -w tcp_keepalive_time=1800                # 默认7200�Q�tcp keeplive旉���<br /><br />sysctl -w tcp_fin_timeout=30                        # 默认60�Q�tcp fin状态超时时�?br /><br />#sysctl -w net.ipv4.tcp_retries1=2                     # tcp�q�接重传参数�Q�慎�?br /><br />#sysctl -w net.ipv4.tcp_retries2=8<br /><br /> <br /><br />sysctl -w net.ipv4.ip_conntrack_max=65535          # 增大iptables状态跟�t�表 <br /><br /><br />待验证：<br /> 1.�Q�客��L��问题�Q?  <br />         包阻塞的情况多发生于�~�冲区域充满了数据，客户端不再进行读取操作时�?  <br />         �q�种情况下，可能是由于客��L��的处理节奏慢于接受包的速度�Q�可以考虑   <br />         ���包处理�q�程攑օ��U�程处理�Q�而对包的接受采用��d��的方式�?  <br />   2.�Q�服务器端问题）   <br />         �׃��数据包头中部分变量的�c�d��定义不合理而引起包的流水号���界或溢出，   <br />         都可能导致服务器端出现core文�g或异常停止。徏议如果有在包头中定义   <br />         ���水��L���Q�用long型变量�?  <br />   3.�Q�协议包问题�Q?  <br />         在大数据量传输中�Q�尽量减���网�l�资源的重复使用�ơ数�Q�所以在�|�络状况   <br />         佳的情况下，��������原有的包体长度适当的扩大。如2k扩大�?0k左右�Q?  <br />         同时可以减少客户端的处理�ơ数�?br /><br /><br /><img src ="http://www.tkk7.com/fine/aggbug/217709.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/fine/" target="_blank">Peter Pan</a> 2008-07-26 20:31 <a href="http://www.tkk7.com/fine/archive/2008/07/26/217709.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>Oracle的Blob字段</title><link>http://www.tkk7.com/fine/archive/2008/05/31/204925.html</link><dc:creator>Peter Pan</dc:creator><author>Peter Pan</author><pubDate>Sat, 31 May 2008 11:53:00 GMT</pubDate><guid>http://www.tkk7.com/fine/archive/2008/05/31/204925.html</guid><wfw:comment>http://www.tkk7.com/fine/comments/204925.html</wfw:comment><comments>http://www.tkk7.com/fine/archive/2008/05/31/204925.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.tkk7.com/fine/comments/commentRss/204925.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/fine/services/trackbacks/204925.html</trackback:ping><description><![CDATA[Oracle的Blob字段比较�Ҏ���Q�他比long字段的性能要好很多�Q�可以用来保存例如图片之�cȝ��二进制数据�?
<br /><br />写入Blob字段和写入其它类型字�D늚�方式非常不同�Q�因为Blob自��n有一个cursor�Q�你必须使用cursor对blob�q�行操作�Q�因而你在写入Blob之前�Q�必��获得cursor才能�q�行写入�Q�那么如何获得Blob的cursor呢？
<br /><br />�q�需要你先插入一个empty的blob�Q�这���创��Z��个blob的cursor�Q�然后你再把�q�个empty的blob的cursor用select查询出来�Q�这样通过两步操作�Q�你���p��得了blob的cursor�Q�可以真正的写入blob数据了�?
<br /><br />看下面的JDBC的demo�Q�把oraclejdbc.jar�q�个二进制文件写入数据库表javatest的content字段(�q�是一个blob型字�D?
<br /><br />[code:1]import java.sql.*;
<br />import java.io.*;
<br />import oracle.sql.*;
<br />public class WriteBlob {
<br /><br />  public static void main(String[] args) {
<br /><br />    try {
<br />      DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
<br />      Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:orcl","fankai","fankai");
<br />      conn.setAutoCommit(false);
<br /><br />      BLOB blob = null;
<br /><br />      PreparedStatement pstmt = conn.prepareStatement("insert into javatest(name,content) values(?,empty_blob())");
<br />      pstmt.setString(1,"fankai");
<br />      pstmt.executeUpdate();
<br />      pstmt.close();
<br /><br />      pstmt = conn.prepareStatement("select content from javatest where name= ? for update");
<br />      pstmt.setString(1,"fankai");
<br />      ResultSet rset = pstmt.executeQuery();
<br />      if (rset.next()) blob = (BLOB) rset.getBlob(1);
<br /><br />      String fileName = "oraclejdbc.jar";
<br />      File f = new File(fileName);
<br />      FileInputStream fin = new FileInputStream(f);
<br />      System.out.println("file size = " + fin.available());
<br /><br />      pstmt = conn.prepareStatement("update javatest set content=? where name=?");
<br /><br />      OutputStream out = blob.getBinaryOutputStream();
<br /><br />      int count = -1, total = 0;
<br />      byte[] data = new byte[(int)fin.available()];
<br />      fin.read(data);
<br />      out.write(data);
<br />      /*
<br />      byte[] data = new byte[blob.getBufferSize()];  另一�U�实现方�?节省内存
<br />      while ((count = fin.read(data)) != -1) {
<br />        total += count;
<br />        out.write(data, 0, count);
<br />      }
<br />      */
<br /><br />      fin.close();
<br />      out.close();
<br /><br />      pstmt.setBlob(1,blob);
<br />      pstmt.setString(2,"fankai");
<br /><br />      pstmt.executeUpdate();
<br />      pstmt.close();
<br /><br />      conn.commit();
<br />      conn.close();
<br />    } catch (SQLException e) {
<br />      System.err.println(e.getMessage());
<br />      e.printStackTrace();
<br />    } catch (IOException e) {
<br />      System.err.println(e.getMessage());
<br />    }
<br />  }
<br /><br />}[/code:1]
<br /><br /><br /><br />仔细看上例，分三步：
<br /><br />1、插入空blob
<br />into javatest(name,content) values(?,empty_blob());
<br /><br />2、获得blob的cursor
<br />select content from javatest where name= ? for update;
<br /><br />注意�Q�！�Q�必���d��for update�Q�这���锁定该行，直至该行被修改完毕，保证不��生�ƈ发冲�H��?
<br /><br />3、update javatest set content=? where name=
<br /><br />用cursor往数据库写数据
<br /><br />�q�里面还有一点要提醒大家�Q?
<br /><br />JDK1.3带的JDBC2.0规范是不完善的，只有读Blob的接口，而没有写Blob的接口，JDK1.4带的JDBC3.0加入了写
Blob的接口。你可以使用JDBC3.0的接口，也可以直接��用Oracle的JDBC的API�Q�我在上例中使用了Oracle的JDBC的API�?
<br /><br />另外要注意的是：
<br /><br />java.sql.Blob
<br />oracle.sql.BLOB
<br /><br />注意看blob的大���写�Q�是不一��L��。写�E�序的时候不要搞混了�?
<br /><br />下面看看用Hibernate怎么写，原理是一��L���Q�也要分三步�Q�但是代码简单很�?
<br /><br />�q�是Cat对象定义
<br />[code:1]package com.fankai;
<br /><br />import java.sql.Blob;
<br /><br />public class Cat {
<br />  private String id;
<br />  private String name;
<br />  private char sex;
<br />  private float weight;
<br />  private Blob image;
<br />  public Cat() { }
<br /><br />  public String getId() { return id; }
<br />  public void setId(String id) { this.id = id; }
<br /><br />  public String getName() { return name; }
<br />  public void setName(String name) { this.name = name; }
<br /><br />  public char getSex() { return sex; }
<br />  public void setSex(char sex) { this.sex = sex; }
<br /><br />  public float getWeight() { return weight; }
<br />  public void setWeight(float weight) { this.weight = weight; }
<br /><br />  public Blob getImage() { return image; }
<br />  public void setImage(Blob image) { this.image = image;}
<br />}[/code:1]
<br /><br />�q�是Cat.hbm.xml
<br /><br />[code:1]&lt;?xml version="1.0"?&gt;
<br />&lt;!DOCTYPE hibernate-mapping SYSTEM "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd"&gt;
<br /><br />&lt;hibernate-mapping&gt;
<br />    &lt;class name="com.fankai.Cat" table="cat"&gt;
<br />        &lt;!--jcs-cache usage="read-only"/--&gt;
<br />        &lt;id name="id" unsaved-value="null"&gt;
<br />            &lt;generator class="uuid.hex"/&gt;
<br />        &lt;/id&gt;
<br />        &lt;property name="name" length="16" not-null="true"/&gt;
<br />        &lt;property name="sex" length="1" not-null="true"/&gt;
<br />        &lt;property name="weight" /&gt;
<br />        &lt;property name="image" /&gt;
<br />    &lt;/class&gt;
<br />&lt;/hibernate-mapping&gt;[/code:1]
<br /><br /><br />下面是完整的用Hibernate写入Blob的例子，相比JDBC�Q�已�l�简单轻村֤�了，也不用写那些Oracle�Ҏ��的sql了：
<br /><br />[code:1]package com.fankai;
<br /><br />import java.sql.Blob;
<br />import net.sf.hibernate.*;
<br />import oracle.sql.*;
<br />import java.io.*;
<br /><br />public class TestCatHibernate {  
<br />  public static void testBlob() {
<br />    Session s = null;    
<br />    byte[] buffer = new byte[1];
<br />    buffer[0] = 1;
<br />    try {
<br />      SessionFactory sf = HibernateSessionFactory.getSessionFactory();
<br />      s = sf.openSession();  
<br />      Transaction tx = s.beginTransaction();
<br />      Cat c = new Cat();
<br />      c.setName("Robbin");
<br />      c.setImage(Hibernate.createBlob(buffer));
<br />      s.save(c);
<br />      s.flush();
<br />      s.refresh(c, LockMode.UPGRADE);    
<br />      BLOB blob = (BLOB) c.getImage();      
<br />      OutputStream out = blob.getBinaryOutputStream();   
<br />      String fileName = "oraclejdbc.jar";
<br />      File f = new File(fileName);
<br />      FileInputStream fin = new FileInputStream(f);   
<br />      int count = -1, total = 0;
<br />      byte[] data = new byte[(int)fin.available()];
<br />      fin.read(data);
<br />      out.write(data);      
<br />      fin.close();
<br />      out.close();
<br />      s.flush();
<br />      tx.commit();
<br /><br />    } catch (Exception e) {
<br />      System.out.println(e.getMessage());
<br />    } finally {
<br />      if (s != null)
<br />        try {
<br />          s.close();
<br />        } catch (Exception e) {}
<br />    }    
<br /><br />  }
<br />}[/code:1]
    <img src ="http://www.tkk7.com/fine/aggbug/204925.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/fine/" target="_blank">Peter Pan</a> 2008-05-31 19:53 <a href="http://www.tkk7.com/fine/archive/2008/05/31/204925.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>trs常见问题</title><link>http://www.tkk7.com/fine/archive/2008/05/30/204179.html</link><dc:creator>Peter Pan</dc:creator><author>Peter Pan</author><pubDate>Fri, 30 May 2008 12:27:00 GMT</pubDate><guid>http://www.tkk7.com/fine/archive/2008/05/30/204179.html</guid><wfw:comment>http://www.tkk7.com/fine/comments/204179.html</wfw:comment><comments>http://www.tkk7.com/fine/archive/2008/05/30/204179.html#Feedback</comments><slash:comments>2</slash:comments><wfw:commentRss>http://www.tkk7.com/fine/comments/commentRss/204179.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/fine/services/trackbacks/204179.html</trackback:ping><description><![CDATA[
		<p>问题1: <br />        配置Javabeans�Ӟ��出现错误信息"没有扑ֈ�本地�Ҏ���?java.lang.UnsatisfiedLinkError"�?<br />错误原因: <br />trsbean.jar对应的本地方法库trsbean.dll或libtrsbean.so配置不正����?<br />解决�Ҏ���Q?<br />        1.���认安装介质在传输过�E�中没有损坏�Q�如ftp传输需要��用二�q�制模式�?<br />        2.���认操作�pȝ��的版本和JDK的位数�?<br />           JavaBeans的位数必���d��JDK的位��C��持一��_���?2位JDK必须使用32位JavaBeans�?<br />           JavaBeans的��^台必���d��JDK的��^��C��持一致。如AIX5.1�q�_��的JavaBeans只支持AIX5.1/5.2/5.3�Q�不支持AIX4.3或其它厂商的Unix�?<br />        3.注意libtrsbean.so的文件属性�?<br />           如HP�q�_���Q�必��设�|�libtrsbean.sl的可执行权限�?<br />        4.注意trsbean.dll/libtrsbean.so的存放�\径，应该包含在JAVA本地�Ҏ��库的搜烦路径�?<br />           Windows�q�_���Q?<br />               JAVA本地�Ҏ��库的搜烦路径包含环境变量PATH�?JAVA_HOME%/jre/bin�Q?<br />           Linux/Solaris�q�_���Q?<br />               JAVA本地�Ҏ��库的搜烦路径包含环境变量LD_LIBRARY_PATH�Q?<br />           AIX�q�_��: <br />               JAVA本地�Ҏ��库的搜烦路径包含环境变量LIBPATH�Q?<br />           HPUX�q�_��: <br />               JAVA本地�Ҏ��库的搜烦路径包含环境变量SHLIB_PATH�Q?<br />      <br />           JDK1.4以上版本�Q�也可以在java启动参数中设�|�系�l�属性java.library.path, 指向libtrsbean.so所在的目录�Q�如java -Djava.library.path="/home/trs/trsbean" <br /><br />           通常情况下，在应用服务器的启动脚本中指定本地�Ҏ��库的搜烦路径。          �?<br /><br />问题2: <br />       多套应用同时使用javabean�Q�出现错误信�?java.lang.UnsatisfiedLinkError: Native Library trsbean.dll already loaded in another classloader"�?<br />错误原因�Q?<br />       一个JAVA�q�程�Q�JAVA本地�Ҏ��库只能被加蝲一�ơ，如果被多�ơ加载就会出现该错误�?<br />解决�Ҏ���Q?<br />        保证在一个JAVA虚拟��Z���Q�TRS Javabeans的本地方法库只被加蝲一�ơ�?<br />如果应用服务器上的多个应用��用TRS JavaBeans�Q�不能将trsbean.jar部��v到每个应用下�?<br />        �����只保留一套TRS JavaBeans�Q�在应用服务器中配置全局的trsbean.jar�?<br />以Tomcat4.1.36, Windows�pȝ����Z���Q?<br />            ���trsbean.jar攑֜�%TOMCAT_HOME%/common/lib�Q�或修改启动脚本中的CLASSPATH变量�?<br />            ���trsbean.dll攑֜��pȝ��动态库的搜索�\径�?<br /><br />问题3: <br />      ��Z��么TRSConnection和TRSResultSet需要close? 能否���TRS对象攑֜�WEB应用的Session�? <br />�{�案3: <br />      TRSConnection对应TRS�q�接, TRSResultSet对应TRS�l�果集，占用���量的Native内存�?<br />      如果�E�序不调用close�Ҏ��关闭�Q�会造成Native内存泄露�Q�严重时��D��java�q�程出现OutOfMemory错误�?<br />      如果���TRS对象攑֜�Session中，WEB客户端快速翻��|��会导致记录内容的不一致�?</p>
<img src ="http://www.tkk7.com/fine/aggbug/204179.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/fine/" target="_blank">Peter Pan</a> 2008-05-30 20:27 <a href="http://www.tkk7.com/fine/archive/2008/05/30/204179.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>内存泄漏的检��?/title><link>http://www.tkk7.com/fine/archive/2008/05/21/201830.html</link><dc:creator>Peter Pan</dc:creator><author>Peter Pan</author><pubDate>Wed, 21 May 2008 01:44:00 GMT</pubDate><guid>http://www.tkk7.com/fine/archive/2008/05/21/201830.html</guid><wfw:comment>http://www.tkk7.com/fine/comments/201830.html</wfw:comment><comments>http://www.tkk7.com/fine/archive/2008/05/21/201830.html#Feedback</comments><slash:comments>1</slash:comments><wfw:commentRss>http://www.tkk7.com/fine/comments/commentRss/201830.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/fine/services/trackbacks/201830.html</trackback:ping><description><![CDATA[内存泄漏的检��?

有不���工兯���助做�q�个事情的，如果手上一个工具也没有�Q�可以用JDK自带的小工具�Q?

看看谁占满了Heap�Q?
用JDK6的jmap可以昄����q�行�E�序中对象的�c�d���Q�个��C��所占的大小
先用jps 扑ֈ��q�程��P��然后jmap -histo pid 昄����?jmap -dump:file=heap_file_name pid 导出heap文�g
��Z��么这些对象仍然可以到达？
用jhat(Java Heap Analysis Tool) 分析刚才导出的heap文�g�?
先jhat heap_file_name�Q�然后打开���览器http://localhost:7000/ ���览�?
<img src ="http://www.tkk7.com/fine/aggbug/201830.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/fine/" target="_blank">Peter Pan</a> 2008-05-21 09:44 <a href="http://www.tkk7.com/fine/archive/2008/05/21/201830.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>tomcat 使用jconsole </title><link>http://www.tkk7.com/fine/archive/2008/03/14/186203.html</link><dc:creator>Peter Pan</dc:creator><author>Peter Pan</author><pubDate>Fri, 14 Mar 2008 02:23:00 GMT</pubDate><guid>http://www.tkk7.com/fine/archive/2008/03/14/186203.html</guid><wfw:comment>http://www.tkk7.com/fine/comments/186203.html</wfw:comment><comments>http://www.tkk7.com/fine/archive/2008/03/14/186203.html#Feedback</comments><slash:comments>2</slash:comments><wfw:commentRss>http://www.tkk7.com/fine/comments/commentRss/186203.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/fine/services/trackbacks/186203.html</trackback:ping><description><![CDATA[
		<strong>关键�?/strong>: <span id="77fzb9l"    class="hilite2">jconsole</span><div   id="9t9vpzp"   class="blog_content"><ul><li>catalina.bat:</li></ul><p>set JAVA_OPTS=%JAVA_OPTS% -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port="9004" -Dcom.sun.management.jmxremote.authenticate="false" -Dcom.sun.management.jmxremote.ssl="false"<br /> </p><ul><li><div>catalina.sh:</div></li></ul><p>JAVA_OPTS="$JAVA_OPTS -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=9004 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false"<br /><br /><br /><br /><br />linux下要讄���<br />export  LANG=C     <br />C--对英�?ASCII 环境(不知道还有没有别的含义了)<br /></p></div><img src ="http://www.tkk7.com/fine/aggbug/186203.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/fine/" target="_blank">Peter Pan</a> 2008-03-14 10:23 <a href="http://www.tkk7.com/fine/archive/2008/03/14/186203.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>log4j 配置详细</title><link>http://www.tkk7.com/fine/archive/2008/01/28/178127.html</link><dc:creator>Peter Pan</dc:creator><author>Peter Pan</author><pubDate>Mon, 28 Jan 2008 02:04:00 GMT</pubDate><guid>http://www.tkk7.com/fine/archive/2008/01/28/178127.html</guid><wfw:comment>http://www.tkk7.com/fine/comments/178127.html</wfw:comment><comments>http://www.tkk7.com/fine/archive/2008/01/28/178127.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.tkk7.com/fine/comments/commentRss/178127.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/fine/services/trackbacks/178127.html</trackback:ping><description><![CDATA[
		<div style="border: 1px solid rgb(204, 204, 204); padding: 4px 5px 4px 4px; font-size: 13px; width: 98%; background-color: rgb(238, 238, 238);">
				<img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />
				<span style="color: rgb(0, 0, 0);">Log 日志�?br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.consoleAppender</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">org.apache.log4j.ConsoleAppender<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.logfile</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">org.apache.log4j.DailyRollingFileAppender<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />ConsoleAppender�Q�控制台输出<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />FileAppender�Q�文件日志输�?br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />SMTPAppender�Q�发邮�g输出日志<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />SocketAppender�Q�Socket日志<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />NTEventLogAppender�Q�Window NT日志<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />SyslogAppender�Q?br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />JMSAppender�Q?br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />AsyncAppender�Q?br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />NullAppender<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" /><br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />文�g输出�Q�RollingFileAppender<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.rootLogger</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">INFO,logfile<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.logfile</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">org.apache.log4j.RollingFileAppender<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.logfile.Threshold</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">INFO  </span>
				<span style="color: rgb(0, 128, 0);">//</span>
				<span style="color: rgb(0, 128, 0);">输出以上的INFO信息</span>
				<span style="color: rgb(0, 128, 0);">
						<br />
						<img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />
				</span>
				<span style="color: rgb(0, 0, 0);">log4j.appender.logfile.File</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">..</span>
				<span style="color: rgb(0, 0, 0);">/</span>
				<span style="color: rgb(0, 0, 0);">logs</span>
				<span style="color: rgb(0, 0, 0);">/</span>
				<span style="color: rgb(0, 0, 0);">INFO_log    </span>
				<span style="color: rgb(0, 128, 0);">//</span>
				<span style="color: rgb(0, 128, 0);">保存log文�g路径</span>
				<span style="color: rgb(0, 128, 0);">
						<br />
						<img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />
				</span>
				<span style="color: rgb(0, 0, 0);">log4j.appender.logfile.Append</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 255);">true</span>
				<span style="color: rgb(0, 0, 0);">  </span>
				<span style="color: rgb(0, 128, 0);">//</span>
				<span style="color: rgb(0, 128, 0);">默认为true�Q�添加到末尾�Q�false在每�ơ启动时�q�行覆盖</span>
				<span style="color: rgb(0, 128, 0);">
						<br />
						<img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />
				</span>
				<span style="color: rgb(0, 0, 0);">log4j.appender.logfile.MaxFileSize</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">10KB </span>
				<span style="color: rgb(0, 128, 0);">//</span>
				<span style="color: rgb(0, 128, 0);">一个log文�g的大���，���过�q�个大小���又会生�?个日志�?/span>
				<span style="color: rgb(0, 128, 0);">//</span>
				<span style="color: rgb(0, 128, 0);">KB �Q�MB�Q�GB</span>
				<span style="color: rgb(0, 128, 0);">
						<br />
						<img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />
				</span>
				<span style="color: rgb(0, 0, 0);">log4j.appender.logfile.MaxBackupIndex</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">3</span>
				<span style="color: rgb(0, 0, 0);"> </span>
				<span style="color: rgb(0, 128, 0);">//</span>
				<span style="color: rgb(0, 128, 0);">最多保�?个文件备�?/span>
				<span style="color: rgb(0, 128, 0);">
						<br />
						<img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />
				</span>
				<span style="color: rgb(0, 0, 0);">log4j.appender.logfile.layout</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">org.apache.log4j.HTMLLayout </span>
				<span style="color: rgb(0, 128, 0);">//</span>
				<span style="color: rgb(0, 128, 0);">输出文�g的格�?/span>
				<span style="color: rgb(0, 128, 0);">
						<br />
						<img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />
				</span>
				<span style="color: rgb(0, 0, 0);">log4j.appender.logfile.layout.LocationInfo</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 255);">true</span>
				<span style="color: rgb(0, 0, 0);"> #是否昄����c�d��和行�?br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.logfile.layout.Title</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">��面title  #html��面�?/span>
				<span style="color: rgb(0, 0, 0);">&lt;</span>
				<span style="color: rgb(0, 0, 0);">title</span>
				<span style="color: rgb(0, 0, 0);">&gt;</span>
				<span style="color: rgb(0, 0, 0);">
						<br />
						<img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />############################## SampleLayout ####################################<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" /># log4j.appender.logfile.layout</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">org.apache.log4j.SampleLayout<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />############################## PatternLayout ###################################<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" /># log4j.appender.logfile.layout</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">org.apache.log4j.PatternLayout<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" /># log4j.appender.logfile.layout.ConversionPattern</span>
				<span style="color: rgb(0, 0, 0);">=%</span>
				<span style="color: rgb(0, 0, 0);">d </span>
				<span style="color: rgb(0, 0, 0);">%</span>
				<span style="color: rgb(0, 0, 0);">p [</span>
				<span style="color: rgb(0, 0, 0);">%</span>
				<span style="color: rgb(0, 0, 0);">c] </span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);"> </span>
				<span style="color: rgb(0, 0, 0);">%</span>
				<span style="color: rgb(0, 0, 0);">m</span>
				<span style="color: rgb(0, 0, 0);">%</span>
				<span style="color: rgb(0, 0, 0);">n </span>
				<span style="color: rgb(0, 0, 0);">%</span>
				<span style="color: rgb(0, 0, 0);">d<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />############################## XMLLayout #######################################<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" /># log4j.appender.logfile.layout</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">org.apache.log4j.XMLLayout<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" /># log4j.appender.logfile.layout.LocationInfo</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 255);">true</span>
				<span style="color: rgb(0, 0, 0);"> #是否昄����c�d��和行�?br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />############################## TTCCLayout ######################################<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" /># log4j.appender.logfile.layout</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">org.apache.log4j.TTCCLayout<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" /># log4j.appender.logfile.layout.DateFormat</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">ISO8601<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />#NULL, RELATIVE, ABSOLUTE, DATE or ISO8601.<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" /># log4j.appender.logfile.layout.TimeZoneID</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">GMT</span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);">8</span>
				<span style="color: rgb(0, 0, 0);">:</span>
				<span style="color: rgb(0, 0, 0);">00</span>
				<span style="color: rgb(0, 0, 0);">
						<br />
						<img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" /># log4j.appender.logfile.layout.CategoryPrefixing</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 255);">false</span>
				<span style="color: rgb(0, 0, 0);"> ##默认为true 打印�c�d���?br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" /># log4j.appender.logfile.layout.ContextPrinting</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 255);">false</span>
				<span style="color: rgb(0, 0, 0);"> ##默认为true 打印上下文信�?br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" /># log4j.appender.logfile.layout.ThreadPrinting</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 255);">false</span>
				<span style="color: rgb(0, 0, 0);"> ##默认为true 打印�U�程�?br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" /># 打印信息如下�Q?br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" /></span>
				<span style="color: rgb(0, 0, 0);">2007</span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);">09</span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);">13</span>
				<span style="color: rgb(0, 0, 0);"> </span>
				<span style="color: rgb(0, 0, 0);">14</span>
				<span style="color: rgb(0, 0, 0);">:</span>
				<span style="color: rgb(0, 0, 0);">45</span>
				<span style="color: rgb(0, 0, 0);">:</span>
				<span style="color: rgb(0, 0, 0);">39</span>
				<span style="color: rgb(0, 0, 0);">,</span>
				<span style="color: rgb(0, 0, 0);">765</span>
				<span style="color: rgb(0, 0, 0);"> [http</span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);">8080</span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);">1</span>
				<span style="color: rgb(0, 0, 0);">] ERROR com.poxool.test.test </span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);"> error成功关闭链接<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />###############################################################################<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />每天文�g的输出：DailyRollingFileAppender<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.rootLogger</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">INFO,errorlogfile<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.errorlogfile</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">org.apache.log4j.DailyRollingFileAppender<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.errorlogfile.Threshold</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">ERROR<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.errorlogfile.File</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">..</span>
				<span style="color: rgb(0, 0, 0);">/</span>
				<span style="color: rgb(0, 0, 0);">logs</span>
				<span style="color: rgb(0, 0, 0);">/</span>
				<span style="color: rgb(0, 0, 0);">ERROR_log<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.errorlogfile.Append</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 255);">true</span>
				<span style="color: rgb(0, 0, 0);"> #默认为true�Q�添加到末尾�Q�false在每�ơ启动时�q�行覆盖<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.errorlogfile.ImmediateFlush</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 255);">true</span>
				<span style="color: rgb(0, 0, 0);">  #直接输出�Q�不�q�行�~�存<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />#</span>
				<span style="color: rgb(0, 0, 0);">'</span>
				<span style="color: rgb(0, 0, 0);">.</span>
				<span style="color: rgb(0, 0, 0);">'</span>
				<span style="color: rgb(0, 0, 0);">yyyy</span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);">MM: 每个月更��C��个log日志<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />#</span>
				<span style="color: rgb(0, 0, 0);">'</span>
				<span style="color: rgb(0, 0, 0);">.</span>
				<span style="color: rgb(0, 0, 0);">'</span>
				<span style="color: rgb(0, 0, 0);">yyyy</span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);">ww: 每个星期更新一个log日志<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />#</span>
				<span style="color: rgb(0, 0, 0);">'</span>
				<span style="color: rgb(0, 0, 0);">.</span>
				<span style="color: rgb(0, 0, 0);">'</span>
				<span style="color: rgb(0, 0, 0);">yyyy</span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);">MM</span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);">dd: 每天更新一个log日志<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />#</span>
				<span style="color: rgb(0, 0, 0);">'</span>
				<span style="color: rgb(0, 0, 0);">.</span>
				<span style="color: rgb(0, 0, 0);">'</span>
				<span style="color: rgb(0, 0, 0);">yyyy</span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);">MM</span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);">dd</span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);">a: 每天的午夜和正午更新一个log日志<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />#</span>
				<span style="color: rgb(0, 0, 0);">'</span>
				<span style="color: rgb(0, 0, 0);">.</span>
				<span style="color: rgb(0, 0, 0);">'</span>
				<span style="color: rgb(0, 0, 0);">yyyy</span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);">MM</span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);">dd</span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);">HH: 每小时更��C��个log日志<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />#</span>
				<span style="color: rgb(0, 0, 0);">'</span>
				<span style="color: rgb(0, 0, 0);">.</span>
				<span style="color: rgb(0, 0, 0);">'</span>
				<span style="color: rgb(0, 0, 0);">yyyy</span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);">MM</span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);">dd</span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);">HH</span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);">mm: 每分钟更��C��个log日志<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.errorlogfile.DatePattern</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">'</span>
				<span style="color: rgb(0, 0, 0);">.</span>
				<span style="color: rgb(0, 0, 0);">'</span>
				<span style="color: rgb(0, 0, 0);">yyyy</span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);">MM</span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);">dd</span>
				<span style="color: rgb(0, 0, 0);">'</span>
				<span style="color: rgb(0, 0, 0);">.log</span>
				<span style="color: rgb(0, 0, 0);">'</span>
				<span style="color: rgb(0, 0, 0);"> #文�g名称的格�?br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.errorlogfile.layout</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">org.apache.log4j.PatternLayout<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.errorlogfile.layout.ConversionPattern</span>
				<span style="color: rgb(0, 0, 0);">=%</span>
				<span style="color: rgb(0, 0, 0);">d </span>
				<span style="color: rgb(0, 0, 0);">%</span>
				<span style="color: rgb(0, 0, 0);">p [</span>
				<span style="color: rgb(0, 0, 0);">%</span>
				<span style="color: rgb(0, 0, 0);">c] </span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);"> </span>
				<span style="color: rgb(0, 0, 0);">%</span>
				<span style="color: rgb(0, 0, 0);">m</span>
				<span style="color: rgb(0, 0, 0);">%</span>
				<span style="color: rgb(0, 0, 0);">n </span>
				<span style="color: rgb(0, 0, 0);">%</span>
				<span style="color: rgb(0, 0, 0);">d<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" /><br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />控制台输出：<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.rootLogger</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">INFO,consoleAppender<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.consoleAppender</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">org.apache.log4j.ConsoleAppender<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.consoleAppender.Threshold</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">ERROR<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.consoleAppender.layout</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">org.apache.log4j.PatternLayout<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.consoleAppender.layout.ConversionPattern</span>
				<span style="color: rgb(0, 0, 0);">=%</span>
				<span style="color: rgb(0, 0, 0);">d </span>
				<span style="color: rgb(0, 0, 0);">%-</span>
				<span style="color: rgb(0, 0, 0);">5p </span>
				<span style="color: rgb(0, 0, 0);">%</span>
				<span style="color: rgb(0, 0, 0);">m</span>
				<span style="color: rgb(0, 0, 0);">%</span>
				<span style="color: rgb(0, 0, 0);">n<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.consoleAppender.ImmediateFlush</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 255);">true</span>
				<span style="color: rgb(0, 0, 0);">  </span>
				<span style="color: rgb(0, 128, 0);">//</span>
				<span style="color: rgb(0, 128, 0);">直接输出�Q�不�q�行�~�存</span>
				<span style="color: rgb(0, 128, 0);">
						<br />
						<img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />
				</span>
				<span style="color: rgb(0, 0, 0);">log4j.appender.consoleAppender.Target</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">System.err </span>
				<span style="color: rgb(0, 128, 0);">//</span>
				<span style="color: rgb(0, 128, 0);">默认是System.out方式输出</span>
				<span style="color: rgb(0, 128, 0);">
						<br />
						<img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />
				</span>
				<span style="color: rgb(0, 0, 0);">
						<br />
						<img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />发送邮�Ӟ��SMTPAppender<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.rootLogger</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">INFO,MAIL<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.MAIL</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">org.apache.log4j.net.SMTPAppender<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.MAIL.Threshold</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">DEBUG<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.MAIL.BufferSize</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">10KB<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.MAIL.From</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">yu77585211111@</span>
				<span style="color: rgb(0, 0, 0);">163</span>
				<span style="color: rgb(0, 0, 0);">.com<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.MAIL.SMTPHost</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">mail.myce.net.cn<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.MAIL.Subject</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">Log4J Message<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.MAIL.To</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">yuyongpeng@myce.net.cn<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.MAIL.layout</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">org.apache.log4j.PatternLayout<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.MAIL.layout.ConversionPattern</span>
				<span style="color: rgb(0, 0, 0);">=%</span>
				<span style="color: rgb(0, 0, 0);">d </span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);"> </span>
				<span style="color: rgb(0, 0, 0);">%</span>
				<span style="color: rgb(0, 0, 0);">c </span>
				<span style="color: rgb(0, 0, 0);">-%-</span>
				<span style="color: rgb(0, 0, 0);">4r [</span>
				<span style="color: rgb(0, 0, 0);">%</span>
				<span style="color: rgb(0, 0, 0);">t] </span>
				<span style="color: rgb(0, 0, 0);">%-</span>
				<span style="color: rgb(0, 0, 0);">5p </span>
				<span style="color: rgb(0, 0, 0);">%</span>
				<span style="color: rgb(0, 0, 0);">c </span>
				<span style="color: rgb(0, 0, 0);">%</span>
				<span style="color: rgb(0, 0, 0);">x </span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);"> </span>
				<span style="color: rgb(0, 0, 0);">%</span>
				<span style="color: rgb(0, 0, 0);">m</span>
				<span style="color: rgb(0, 0, 0);">%</span>
				<span style="color: rgb(0, 0, 0);">n<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" /><br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />数据库：JDBCAppender<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.DATABASE</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">org.apache.log4j.jdbc.JDBCAppender<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.DATABASE.URL</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">jdbc:oracle:thin:@</span>
				<span style="color: rgb(0, 0, 0);">210.51</span>
				<span style="color: rgb(0, 0, 0);">.</span>
				<span style="color: rgb(0, 0, 0);">173.94</span>
				<span style="color: rgb(0, 0, 0);">:</span>
				<span style="color: rgb(0, 0, 0);">1521</span>
				<span style="color: rgb(0, 0, 0);">:YDB<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.DATABASE.driver</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">oracle.jdbc.driver.OracleDriver<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.DATABASE.user</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">ydbuser<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.DATABASE.password</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">ydbuser<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.DATABASE.sql</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">INSERT INTO A1 (TITLE3) VALUES (</span>
				<span style="color: rgb(0, 0, 0);">'</span>
				<span style="color: rgb(0, 0, 0);"> %d - %c %-5p %c %x - %m%n</span>
				<span style="color: rgb(0, 0, 0);">'</span>
				<span style="color: rgb(0, 0, 0);">)<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.DATABASE.layout</span>
				<span style="color: rgb(0, 0, 0);">=</span>
				<span style="color: rgb(0, 0, 0);">org.apache.log4j.PatternLayout<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" />log4j.appender.DATABASE.layout.ConversionPattern</span>
				<span style="color: rgb(0, 0, 0);">=%</span>
				<span style="color: rgb(0, 0, 0);">d </span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);"> </span>
				<span style="color: rgb(0, 0, 0);">%</span>
				<span style="color: rgb(0, 0, 0);">c </span>
				<span style="color: rgb(0, 0, 0);">-%-</span>
				<span style="color: rgb(0, 0, 0);">4r [</span>
				<span style="color: rgb(0, 0, 0);">%</span>
				<span style="color: rgb(0, 0, 0);">t] </span>
				<span style="color: rgb(0, 0, 0);">%-</span>
				<span style="color: rgb(0, 0, 0);">5p </span>
				<span style="color: rgb(0, 0, 0);">%</span>
				<span style="color: rgb(0, 0, 0);">c </span>
				<span style="color: rgb(0, 0, 0);">%</span>
				<span style="color: rgb(0, 0, 0);">x </span>
				<span style="color: rgb(0, 0, 0);">-</span>
				<span style="color: rgb(0, 0, 0);"> </span>
				<span style="color: rgb(0, 0, 0);">%</span>
				<span style="color: rgb(0, 0, 0);">m</span>
				<span style="color: rgb(0, 0, 0);">%</span>
				<span style="color: rgb(0, 0, 0);">n<br /><img src="http://www.tkk7.com/images/OutliningIndicators/None.gif" align="top" /></span> <span style="color: rgb(0, 128, 0);"> </span><span style="color: rgb(0, 128, 0);"></span></div>
<img src ="http://www.tkk7.com/fine/aggbug/178127.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/fine/" target="_blank">Peter Pan</a> 2008-01-28 10:04 <a href="http://www.tkk7.com/fine/archive/2008/01/28/178127.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>JVM内存参数调优(看到的比较好的文章，���Z��攉���一�?</title><link>http://www.tkk7.com/fine/archive/2008/01/14/175190.html</link><dc:creator>Peter Pan</dc:creator><author>Peter Pan</author><pubDate>Mon, 14 Jan 2008 05:55:00 GMT</pubDate><guid>http://www.tkk7.com/fine/archive/2008/01/14/175190.html</guid><wfw:comment>http://www.tkk7.com/fine/comments/175190.html</wfw:comment><comments>http://www.tkk7.com/fine/archive/2008/01/14/175190.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.tkk7.com/fine/comments/commentRss/175190.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/fine/services/trackbacks/175190.html</trackback:ping><description><![CDATA[&nbsp;&nbsp;&nbsp;&nbsp; 摘要: JVM
				
				
						内存参数调优
				
		
		
				我们前面所提到的堆内存�Q�heap�Q�是由Java虚拟机控制管理的�Q�因此，�q�些参数对JVM而言都有一个默认��|��但在某些情况下这些参数的默认值�ƈ不是最优的�Q�这���需要我们通过调整�q�些参数的值来提高JVM的性能�Q�最�l�提高应用的性能指标�?		
		
				在实际的应用开发中�Q�如果应用所使用的系�l�内存较�?..&nbsp;&nbsp;<a href='http://www.tkk7.com/fine/archive/2008/01/14/175190.html'>阅读全文</a><img src ="http://www.tkk7.com/fine/aggbug/175190.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/fine/" target="_blank">Peter Pan</a> 2008-01-14 13:55 <a href="http://www.tkk7.com/fine/archive/2008/01/14/175190.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>apache+tomcat集群实践</title><link>http://www.tkk7.com/fine/archive/2007/12/18/168554.html</link><dc:creator>Peter Pan</dc:creator><author>Peter Pan</author><pubDate>Tue, 18 Dec 2007 10:09:00 GMT</pubDate><guid>http://www.tkk7.com/fine/archive/2007/12/18/168554.html</guid><wfw:comment>http://www.tkk7.com/fine/comments/168554.html</wfw:comment><comments>http://www.tkk7.com/fine/archive/2007/12/18/168554.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.tkk7.com/fine/comments/commentRss/168554.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/fine/services/trackbacks/168554.html</trackback:ping><description><![CDATA[
		<p>
				<span id="zoom">
				</span>
		</p>
		<div>
				<p>(一)环境说明<br />(1)服务器有4収ͼ�一台安装apache,三台安装tomcat<br />(2)apache2.0.55、tomcat5.5.15、jk2.0.4、jdk1.5.6或jdk1.4.2<br />(3)ip配置,一台安装apache的ip�?92.168.0.88,三台安装tomcat的服务器ip分别�?92.168.0.1/2/4<br />(�?安装�q�程<br />(1)在三台要安装tomcat的服务器上先安装jdk<br />(2)配置jdk的安装�\�?在环境变量path中加入jdk的bin路径,新徏环境变量JAVA_HOME指向jdk的安装�\�?br />(3)在三台要安装tomcat的服务器上分别安装tomcat,调试三个tomcat到能够正常启�?br />(4)tomcat的默认WEB服务端口�?080,默认的模式是单独服务,我的三个tomcat的WEB服务端口修改�?080/8888/9999<br />修改位置为tomcat的安装目录下的conf/server.xml<br />修改前的配置�?br />    &lt;Connector port="8080" maxHttpHeaderSize="8192"<br />               maxThreads="150" minSpareThreads="25" maxSpareThreads="75"<br />               enableLookups="false" redirectPort="8443" acceptCount="100"<br />               connectionTimeout="20000" disableUploadTimeout="true" /&gt;<br />修改后的配置�?br />    &lt;Connector port="7080" maxHttpHeaderSize="8192"<br />               maxThreads="150" minSpareThreads="25" maxSpareThreads="75"<br />               enableLookups="false" redirectPort="8443" acceptCount="100"<br />               connectionTimeout="20000" disableUploadTimeout="true" /&gt;<br />依次修改每个tomcat的监听端�?7080/8888/9999)<br /><br />(5)分别���试每个tomcat的启动是否正�?br />http://192.168.0.1:7080<br />http://192.168.0.2:8888<br />http://192.168.0.4:9999<br />(�?负蝲均衡配置�q�程<br />(1)在那台要安装apache的服务器上安装apache2.0.55,我的安装路径为默认C:\Program Files\Apache Group\Apache2<br />(2)安装后测试apache能否正常启动�Q�调试到能够正常启动http://192.168.0.88<br />(3)下蝲jk2.0.4后解压羃文�g<br />(4)���解压羃后的目录中的modules目录中的mod_jk2.so文�g复制到apache的安装目录下的modules目录�?我的为C:\Program Files\Apache Group\Apache2\modules<br />(5)修改apache的安装目录中的conf目录的配�|�文件httpd.conf�Q�在文�g中加LoadModule模块配置信息的最后加上一句LoadModule jk2_module modules/mod_jk2.so<br />(6)分别修改三个tomcat的配�|�文件conf/server.xml�Q�修改内容如�?br />修改�?br />    &lt;!-- An Engine represents the entry point (within Catalina) that processes<br />         every request.  The Engine implementation for Tomcat stand alone<br />         analyzes the HTTP headers included with the request, and passes them<br />         on to the appropriate Host (virtual host). --&gt;<br /><br />    &lt;!-- You should set jvmRoute to support load-balancing via AJP ie :<br />    &lt;Engine name="Standalone" defaultHost="localhost" jvmRoute="jvm1"&gt;         <br />    --&gt; <br />         <br />    &lt;!-- Define the top level container in our container hierarchy --&gt;<br />    &lt;Engine name="Catalina" defaultHost="localhost"&gt;<br />修改�?br />    &lt;!-- An Engine represents the entry point (within Catalina) that processes<br />         every request.  The Engine implementation for Tomcat stand alone<br />         analyzes the HTTP headers included with the request, and passes them<br />         on to the appropriate Host (virtual host). --&gt;<br /><br />    &lt;!-- You should set jvmRoute to support load-balancing via AJP ie :--&gt;<br />    &lt;Engine name="Standalone" defaultHost="localhost" jvmRoute="tomcat1"&gt;         <br />     <br />         <br />    &lt;!-- Define the top level container in our container hierarchy <br />    &lt;Engine name="Catalina" defaultHost="localhost"&gt;<br />    --&gt;<br />���其中的jvmRoute="jvm1"分别修改为jvmRoute="tomcat1"和jvmRoute="tomcat2"和jvmRoute="tomcat3"<br /><br />(7)然后重启三个tomcat�Q�调试能够正常启动�?br />(8)在apache的安装目录中的conf目录下创建文件workers2.propertie�Q�写入文件内容如�?br /><br /># fine the communication channel <br />[channel.socket:192.168.0.1:8009] <br />info=Ajp13 forwarding over socket<br />#配置�W�一个服务器 <br />tomcatId=tomcat1 #要和tomcat的配�|�文件server.xml中的jvmRoute="tomcat1"名称一�?br />debug=0 <br />lb_factor=1 #负蝲�q����因子�Q�数字越大请求被分配的几率越�?br /><br /># Define the communication channel <br />[channel.socket:192.168.0.2:8009] <br />info=Ajp13 forwarding over socket<br />tomcatId=tomcat2 <br />debug=0 <br />lb_factor=1 <br /><br /># Define the communication channel <br />[channel.socket:192.168.0.4:8009] <br />info=Ajp13 forwarding over socket<br />tomcatId=tomcat3 <br />debug=0 <br />lb_factor=1 <br /><br />[status:] <br />info=Status worker, displays runtime information.  <br /><br />[uri:/jkstatus.jsp] <br />info=Display status information and checks the config file for changes. <br />group=status: <br /><br />[uri:/*] <br />info=Map the whole webapp <br />debug=0<br />(9)在三个tomcat的安装目录中的webapps建立相同的应�?我和应用目录名�ؓTomcatDemo,在三个应用目录中建立相同 WEB-INF目录和页面index.jsp,index.jsp的页面内容如�?br />&lt;%@ page contentType="text/html; charset=GBK" %&gt;<br />&lt;%@ page import="java.util.*" %&gt;<br />&lt;html&gt;&lt;head&gt;&lt;title&gt;Cluster App Test&lt;/title&gt;&lt;/head&gt;<br />&lt;body&gt;<br />Server Info:<br />&lt;%<br />out.println(request.getLocalAddr() + " : " + request.getLocalPort()+"&lt;br&gt;");%&gt;<br />&lt;%<br />  out.println("&lt;br&gt; ID " + session.getId()+"&lt;br&gt;");<br /><br />  // 如果有新�?Session 属性设�|?br />  String dataName = request.getParameter("dataName");<br />  if (dataName != null &amp;&amp; dataName.length() &gt; 0) {<br />     String dataValue = request.getParameter("dataValue");<br />     session.setAttribute(dataName, dataValue);<br />  }<br /><br />  out.print("&lt;b&gt;Session 列表&lt;/b&gt;");<br /><br />  Enumeration e = session.getAttributeNames();<br />  while (e.hasMoreElements()) {<br />     String name = (String)e.nextElement();<br />     String value = session.getAttribute(name).toString();<br />     out.println( name + " = " + value+"&lt;br&gt;");<br />         System.out.println( name + " = " + value);<br />   }<br />%&gt;<br />  &lt;form action="index.jsp" method="POST"&gt;<br />    名称:&lt;input type=text size=20 name="dataName"&gt;<br />     &lt;br&gt;<br />    �?&lt;input type=text size=20 name="dataValue"&gt;<br />     &lt;br&gt;<br />    &lt;input type=submit&gt;<br />   &lt;/form&gt;<br />&lt;/body&gt;<br />&lt;/html&gt;<br />(10)重启apache服务器和三个tomcat服务�?到此负蝲 均衡已配�|�完成。测试负载均衡先���试apache,讉K��http://192.168.0.88/jkstatus.jsp<br />能否正常讉K���Q��ƈ查询其中的内容，有三个tomcat的相关配�|�信息和负蝲说明,讉K��http://192.168.0.88/TomcatDemo/index.jsp看能够运�?<br />能运行，则已建立负蝲均衡�?br />(�?tomcat集群配置<br />(1)负蝲均衡配置的条件下配置tomcat集群<br />(2)分别修改三个tomcat的配�|�文件conf/server.xml,修改内容如下<br />修改�?br />        &lt;!-- <br />        &lt;Cluster className="org.apache.catalina.cluster.tcp.SimpleTcpCluster"<br />                 managerClassName="org.apache.catalina.cluster.session.DeltaManager"<br />                 expireSessionsOnShutdown="false"<br />                 useDirtyFlag="true"<br />                 notifyListenersOnReplication="true"&gt;<br /><br />            &lt;Membership <br />                className="org.apache.catalina.cluster.mcast.McastService"<br />                mcastAddr="228.0.0.4"<br />                mcastPort="45564"<br />                mcastFrequency="500"<br />                mcastDropTime="3000"/&gt;<br /><br />            &lt;Receiver <br />                className="org.apache.catalina.cluster.tcp.ReplicationListener"<br />                tcpListenAddress="auto"<br />                tcpListenPort="4001"<br />                tcpSelectorTimeout="100"<br />                tcpThreadCount="6"/&gt;<br /><br />            &lt;Sender<br />                className="org.apache.catalina.cluster.tcp.ReplicationTransmitter"<br />                replicationMode="pooled"<br />                ackTimeout="5000"/&gt;<br /><br />            &lt;Valve className="org.apache.catalina.cluster.tcp.ReplicationValve"<br />                   filter=".*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.htm;.*\.html;.*\.css;.*\.txt;"/&gt;<br />                   <br />            &lt;Deployer className="org.apache.catalina.cluster.deploy.FarmWarDeployer"<br />                      tempDir="/tmp/war-temp/"<br />                      deployDir="/tmp/war-deploy/"<br />                      watchDir="/tmp/war-listen/"<br />                      watchEnabled="false"/&gt;<br />                      <br />            &lt;ClusterListener className="org.apache.catalina.cluster.session.ClusterSessionListener"/&gt;<br />        &lt;/Cluster&gt;<br />        --&gt;   <br />修改�?br />        &lt;!-- modify by whh --&gt;<br />        &lt;Cluster className="org.apache.catalina.cluster.tcp.SimpleTcpCluster"<br />                 managerClassName="org.apache.catalina.cluster.session.DeltaManager"<br />                 expireSessionsOnShutdown="false"<br />                 useDirtyFlag="true"<br />                 notifyListenersOnReplication="true"&gt;<br /><br />            &lt;Membership <br />                className="org.apache.catalina.cluster.mcast.McastService"<br />                mcastAddr="228.0.0.4"<br />                mcastPort="45564"<br />                mcastFrequency="500"<br />                mcastDropTime="3000"/&gt;<br /><br />            &lt;Receiver <br />                className="org.apache.catalina.cluster.tcp.ReplicationListener"<br />                tcpListenAddress="auto"<br />                tcpListenPort="4001"<br />                tcpSelectorTimeout="100"<br />                tcpThreadCount="6"/&gt;<br /><br />            &lt;Sender<br />                className="org.apache.catalina.cluster.tcp.ReplicationTransmitter"<br />                replicationMode="pooled"<br />                ackTimeout="5000"/&gt;<br /><br />            &lt;Valve className="org.apache.catalina.cluster.tcp.ReplicationValve"<br />                   filter=".*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.htm;.*\.html;.*\.css;.*\.txt;"/&gt;<br />                   <br />            &lt;Deployer className="org.apache.catalina.cluster.deploy.FarmWarDeployer"<br />                      tempDir="/tmp/war-temp/"<br />                      deployDir="/tmp/war-deploy/"<br />                      watchDir="/tmp/war-listen/"<br />                      watchEnabled="false"/&gt;<br />                      <br />            &lt;ClusterListener className="org.apache.catalina.cluster.session.ClusterSessionListener"/&gt;<br />        &lt;/Cluster&gt;<br />       &lt;!-- modify by whh --&gt;       <br />���集���配�|�选项的注释放开卛_���Q�如上�?br />(3)重启三个tomcat。到此tomcat的集���已配置完成�?/p>
				<p> </p>
				<p>(�?应用配置<br />对于要进行负载和集群的的tomcat目录下的webapps中的应用中的WEB-INF中的web.xml文�g要添加如下一句配�|?br />&lt;distributable/&gt;<br />配置�?br />&lt;?xml version="1.0" encoding="UTF-8"?&gt;<br />&lt;web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" version="2.4"&gt;<br />  &lt;display-name&gt;TomcatDemo&lt;/display-name&gt;<br />&lt;/web-app&gt;<br />配置�?br />&lt;?xml version="1.0" encoding="UTF-8"?&gt;<br />&lt;web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" version="2.4"&gt;<br />  &lt;display-name&gt;TomcatDemo&lt;/display-name&gt;<br />   &lt;distributable/&gt;<br />&lt;/web-app&gt;<br /><!-- the post be hidden --></p>
				<p>�?tomcat集群是怎么处理session的阿</p>
				<p>�{?在tomcat做集���之后，每个tomcat之间自动�Ҏ��tomcat的配�|�文件中的参数进行session复制,<br />对于一个客��L��对说�Q�只要是同一个IP�Q�那它每�ơ上传的sessionID���是一��L���?<!-- the post be hidden --></p>
		</div>
		<script type="text/javascript">
				<!--
google_ad_client = "pub-4719823006842312";
//728x15, 创徏�?07-11-14
google_ad_slot = "7316259153";
google_ad_width = 650;
google_ad_height = 15;
//-->
		</script>
		<script src="http://pagead2.googlesyndication.com/pagead/show_ads.js" type="text/javascript">
		</script>
<img src ="http://www.tkk7.com/fine/aggbug/168554.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/fine/" target="_blank">Peter Pan</a> 2007-12-18 18:09 <a href="http://www.tkk7.com/fine/archive/2007/12/18/168554.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>Apache-Weblogic bridge安装与配�|?/title><link>http://www.tkk7.com/fine/archive/2007/12/18/168454.html</link><dc:creator>Peter Pan</dc:creator><author>Peter Pan</author><pubDate>Tue, 18 Dec 2007 05:14:00 GMT</pubDate><guid>http://www.tkk7.com/fine/archive/2007/12/18/168454.html</guid><wfw:comment>http://www.tkk7.com/fine/comments/168454.html</wfw:comment><comments>http://www.tkk7.com/fine/archive/2007/12/18/168454.html#Feedback</comments><slash:comments>2</slash:comments><wfw:commentRss>http://www.tkk7.com/fine/comments/commentRss/168454.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/fine/services/trackbacks/168454.html</trackback:ping><description><![CDATA[
		<p>       配置说明�Q?br />1. ���查Apache HTTP Server是否支持Dynamic Shared Object(DSO)�Q�在命��o行执行如下命令：<br /> Apache_Home/bin/apache –l 或Apache_Home/bin/httpd –l<br />若结果列表中有mod_so.c,在说明支持DSO�Q�否则需要加入如下选项重新�~�译Apache�Q?br />   �?br />   --enable-module=so<br />   --enable-rule=SHARED_CORE<br />   �?br />2. 定位.so文�g,�q�将其copy到Apache_Home/modules下�?/p>
		<p align="left">3. 修改Apache_Home/conf/httpd.conf�Q�加入如下代码：<br />3.1  LoadModule weblogic_module modules/mod_wl_20.so<br />3.2  新增一个IfModule定义�Q�对于non-clustered WebLogic Server包括WebLogicHost与WebLogicPort参数�Q�对于Weblogic Server Cluster包括WebLogicCluster参数�Q?br />例：&lt;IfModule mod_weblogic.c&gt;<br />      WebLogicHost 127.0.0.1<br />      WebLogicPort 7001<br />   &lt;/IfModule&gt;<br />   &lt;IfModule mod_weblogic.c&gt;<br />      WebLogicCluster 192.168.0.1�Q?001,192.168.0.2:7001<br />   &lt;/IfModule&gt;<br />3.3  对于proxy requests by MIME type�Q�可以在IfMoudle中增加参数MatchExpression,可以有多个；<br />例：&lt;IfModule mod_weblogic.c&gt;<br />      WebLogicHost 127.0.0.1<br />      WebLogicPort 7001<br />MatchExpression *.jsp<br />MatchExpression *.do<br />   &lt;/IfModule&gt;<br />3.4  对于proxying requests by path�Q�可以新增一个Location的定�? 参数SetHandler用于指定Apache HTTP server plug-in的模式；<br />例：&lt;Location /web&gt;<br />SetHandler weblogic-handler<br />WebLogicHost 192.168.70.78<br />WebLogicPort 7001<br />&lt;/Location&gt;<br />4. 重启BEA Weblogic Server�Q?br />5. 重启Apache HTTP Server�Q?br />6. 打开IE�Q�输入设定的server name�Q�出现系�l�的��d����面�Q�则说明配置成功�?br />7. 对于后期新增的Weblogic server实例�Q�只需要在httpd.conf增加一个Location定义卛_���Q�需要包括参数SetHandler, WebLogicHost, WebLogicPort;</p>
<img src ="http://www.tkk7.com/fine/aggbug/168454.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/fine/" target="_blank">Peter Pan</a> 2007-12-18 13:14 <a href="http://www.tkk7.com/fine/archive/2007/12/18/168454.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>IBM SOA  一  (SCA)</title><link>http://www.tkk7.com/fine/archive/2007/11/22/162275.html</link><dc:creator>Peter Pan</dc:creator><author>Peter Pan</author><pubDate>Thu, 22 Nov 2007 01:43:00 GMT</pubDate><guid>http://www.tkk7.com/fine/archive/2007/11/22/162275.html</guid><wfw:comment>http://www.tkk7.com/fine/comments/162275.html</wfw:comment><comments>http://www.tkk7.com/fine/archive/2007/11/22/162275.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.tkk7.com/fine/comments/commentRss/162275.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/fine/services/trackbacks/162275.html</trackback:ping><description><![CDATA[
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<b style="mso-bidi-font-weight: normal">
						<span lang="EN-US" style="FONT-SIZE: 14pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">SCA</span>
				</b>
				<b style="mso-bidi-font-weight: normal">
						<span style="FONT-SIZE: 14pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">�Q?span lang="EN-US">Service Component Architecture</span>�Q�编�E�模�?span lang="EN-US"><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /?><o:p></o:p></span></span>
				</b>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">
						<o:p> </o:p>
				</span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">1).</span>
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">使用服务�l��g的客��L��可以选择使用<span lang="EN-US">WSDL</span>接口�?span lang="EN-US">Java</span>接口�?span lang="EN-US"><o:p></o:p></span></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">
						<span style="mso-spacerun: yes">       </span>
				</span>
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">服务�l��g提供�l�别的服务调用的入口�?span lang="EN-US">Interface</span>�Q�接口）。而服务组件本�w�可能也需要调用别的服务，�q�个调用出口�?span lang="EN-US">Reference</span>�Q�引用）。无论是接口�q�是引用�Q�其调用规范都是<span lang="EN-US">WSDL</span>�?span lang="EN-US">Java</span>接口�?span lang="EN-US"><o:p></o:p></span></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">
						<o:p> </o:p>
				</span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">2).SCA</span>
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">服务�l��g与传�l�组件的主要区别在于�Q?span lang="EN-US"><o:p></o:p></span></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">1</span>
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">�Q?服务�l��g往往是粗�_�度的，而传�l�组件以�l�粒度居多�?span lang="EN-US"><o:p></o:p></span></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">2</span>
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">�Q?服务�l��g的接口是标准的，主要�?span lang="EN-US">WSDL</span>接口�Q�而传�l�组件常以具�?span lang="EN-US">API</span>形式出现�?span lang="EN-US"><o:p></o:p></span></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">3</span>
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">�Q?服务�l��g的实��C��语言是无关的�Q�而传�l�组件常�l�定某种特定的语�a��?span lang="EN-US"><o:p></o:p></span></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">4</span>
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">�Q?服务�l��g可以通过�l��g容器提供<span lang="EN-US">QoS</span>的服务，而传�l�组件完全由�E�序代码直接控制�?span lang="EN-US"><o:p></o:p></span></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">
						<o:p> </o:p>
				</span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">3).</span>
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">服务模块�Q?span lang="EN-US">Module</span>�Q?span lang="EN-US"><o:p></o:p></span></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">服务模块�Q�简�U�模块）�׃��个或多个��h��内在业务联系的服务组件构成。把多少服务�l��g攑֜�一个模块中�Q�或者把哪些服务�l��g攑֜�一起主要取决于业务需求和部��v上灵�z�L��的要求<span lang="EN-US"><o:p></o:p></span></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">
						<o:p> </o:p>
				</span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">4).</span>
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">导入�Q?span lang="EN-US">Import</span>�Q�和导出�Q?span lang="EN-US">Export</span>�Q?span lang="EN-US"><o:p></o:p></span></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">两个�Ҏ���?span lang="EN-US">"</span>端点<span lang="EN-US">"</span>�Q�一个是导入�Q?span lang="EN-US">Import</span>�Q�，它的作用是��得模块中的服务组件可以调用模块外部的服务。另一个是导出�Q?span lang="EN-US">Export</span>�Q�，它的作用是��得模块外部的应用可以调用模块中的服务�l��g�?span lang="EN-US"><o:p></o:p></span></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">导入端点提供了四�U�绑定方式，包括�Q?span lang="EN-US">JMS</span>�l�定�Q?span lang="EN-US">Web Service</span>�l�定�Q?span lang="EN-US">SCA</span>�l�定和无状态会�?span lang="EN-US">BEAN</span>的绑定。导出端�Ҏ��供了三种�l�定方式�Q�包括：<span lang="EN-US">JMS</span>�l�定�Q?span lang="EN-US">Web Service</span>�l�定�?span lang="EN-US">SCA</span>�l�定�?span lang="EN-US"><o:p></o:p></span></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">
						<o:p> </o:p>
				</span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">5).</span>
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">�׃�n库（<span lang="EN-US">Library</span>�Q?span lang="EN-US"><o:p></o:p></span></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">�׃�n库包含的内容只有�Q�数据定义，接口定义�Q�数据映���和关系。与模块最大的区别使共享库不包含服务组�Ӟ��因此也就不包含业务逻辑<span lang="EN-US"><o:p></o:p></span></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">
						<o:p> </o:p>
				</span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">6).Standalone Reference<o:p></o:p></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">模块中的服务�l��g是不能直接被外部<span lang="EN-US">Java</span>代码使用的，<span lang="EN-US">Standalone Reference(</span>端点<span lang="EN-US">)</span>���是��Z��让外部的<span lang="EN-US">Java</span>代码能够使用模块中的服务�l��g。这个端点只有引用（<span lang="EN-US">Reference</span>�Q�，而没有接口（<span lang="EN-US">Interface</span>�Q�。这个引用可以调用相应的服务�l��g�?span lang="EN-US"><o:p></o:p></span></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">
						<o:p> </o:p>
				</span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">7).</span>
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">同步调用和异步调�?span lang="EN-US"><o:p></o:p></span></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">面对是基于粗�_�度的服务组�Ӟ��面对的是一些需要比较长旉���才能有响应的应用场景�Q�那么我们就需要一�U�非��d��式调用方式，卛_��步调用方式�?span lang="EN-US"><o:p></o:p></span></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">SCA</span>
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">�~�程模式提供了三�U�方式的异步调用�Q�它们分别是�Q?span lang="EN-US"><o:p></o:p></span></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">1</span>
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">�Q?单向调用方式�?span lang="EN-US"><o:p></o:p></span></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">2</span>
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">�Q?延迟响应方式�?span lang="EN-US"><o:p></o:p></span></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">3</span>
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">�Q?��h��回调方式�?span lang="EN-US"><o:p></o:p></span></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">
						<o:p> </o:p>
				</span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">8).SCA</span>
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">客户端的两种调用方式<span lang="EN-US"><o:p></o:p></span></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">从接口的角度�Q?span lang="EN-US">SCA</span>的客��L���~�程模型有两�U�方式：<span lang="EN-US"><o:p></o:p></span></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">1</span>
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">�Q?静态调用方�?span lang="EN-US"><o:p></o:p></span></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">2</span>
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">�Q?动态调用方�?span lang="EN-US"><o:p></o:p></span></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">
						<o:p> </o:p>
				</span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span lang="EN-US" style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">9).</span>
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">接口�c�d��与调用方�?span lang="EN-US"><o:p></o:p></span></span>
		</p>
		<p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt">
				<span style="FONT-SIZE: 12pt; FONT-FAMILY: 宋体; mso-bidi-font-family: 宋体; mso-font-kerning: 0pt">实际上客��L��采用哪种调用方式是与接口�c�d��有密切的关系。当提供的接口类型是<span lang="EN-US">WSDL</span>�c�d��的，那么客户端的调用方式只能是动态调用方式。由�?span lang="EN-US">WSDL</span>�?span lang="EN-US">SCA</span>模型中主要的接口方式�Q�这样就��D��动态调用方式在<span lang="EN-US">SCA</span>�~�程模型中非常普遍。但是如果提供的接口�c�d���?span lang="EN-US">Java</span>�c�d��的，那么客户端的调用方式可以是动态调用方式，也可以是静态调用方式�?span lang="EN-US"><o:p></o:p></span></span>
		</p>
<img src ="http://www.tkk7.com/fine/aggbug/162275.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/fine/" target="_blank">Peter Pan</a> 2007-11-22 09:43 <a href="http://www.tkk7.com/fine/archive/2007/11/22/162275.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>Struts2中的ValueStack</title><link>http://www.tkk7.com/fine/archive/2007/08/31/141770.html</link><dc:creator>Peter Pan</dc:creator><author>Peter Pan</author><pubDate>Fri, 31 Aug 2007 08:40:00 GMT</pubDate><guid>http://www.tkk7.com/fine/archive/2007/08/31/141770.html</guid><wfw:comment>http://www.tkk7.com/fine/comments/141770.html</wfw:comment><comments>http://www.tkk7.com/fine/archive/2007/08/31/141770.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.tkk7.com/fine/comments/commentRss/141770.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/fine/services/trackbacks/141770.html</trackback:ping><description><![CDATA[Struts2中的ValueStack<br />&lt;%<br /> Enumeration em = request.getAttributeNames();<br /> while(em.hasMoreElements()){<br />  Object obj = em.nextElement();<br />  if(obj.equals("struts.valueStack")){<br />   ValueStack vs = (ValueStack)request.getAttribute("struts.valueStack");<br />   System.out.println(vs.findValue("username"));<br />   System.out.println(vs.findValue("password"));<br />   System.out.println(vs.findValue("[0].username"));<br />   System.out.println(vs.findValue("[0].password"));<br />   vs.toString();<br />  }<br /> }<br /> %&gt;<br />哈哈�Q�原来Struts2在视��N��是这样子拿到值的呀<img src ="http://www.tkk7.com/fine/aggbug/141770.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/fine/" target="_blank">Peter Pan</a> 2007-08-31 16:40 <a href="http://www.tkk7.com/fine/archive/2007/08/31/141770.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>The Life Cycle of a JavaServer Faces Page </title><link>http://www.tkk7.com/fine/archive/2007/08/02/133897.html</link><dc:creator>Peter Pan</dc:creator><author>Peter Pan</author><pubDate>Thu, 02 Aug 2007 00:45:00 GMT</pubDate><guid>http://www.tkk7.com/fine/archive/2007/08/02/133897.html</guid><wfw:comment>http://www.tkk7.com/fine/comments/133897.html</wfw:comment><comments>http://www.tkk7.com/fine/archive/2007/08/02/133897.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.tkk7.com/fine/comments/commentRss/133897.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/fine/services/trackbacks/133897.html</trackback:ping><description><![CDATA[Restore View Phase <br />Apply Request Values Phase<br />Process Validations Phase <br />Update Model Values Phase <br />Invoke Application Phase <br />Render Response Phase <br /><img height="349" alt="JavaServer Faces Standard Request-Response Lifecycle" hspace="0" src="file:///E:/doc/javaee-5-doc-tutorial-1.0_03/javaeetutorial5/doc/images/jsfIntro-lifecycle.gif" width="574" border="0" /><br />JavaServer Faces Standard Request-Response Life Cycle <img src ="http://www.tkk7.com/fine/aggbug/133897.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/fine/" target="_blank">Peter Pan</a> 2007-08-02 08:45 <a href="http://www.tkk7.com/fine/archive/2007/08/02/133897.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>WebLogic.xml</title><link>http://www.tkk7.com/fine/archive/2007/06/26/126370.html</link><dc:creator>Peter Pan</dc:creator><author>Peter Pan</author><pubDate>Tue, 26 Jun 2007 08:44:00 GMT</pubDate><guid>http://www.tkk7.com/fine/archive/2007/06/26/126370.html</guid><wfw:comment>http://www.tkk7.com/fine/comments/126370.html</wfw:comment><comments>http://www.tkk7.com/fine/archive/2007/06/26/126370.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.tkk7.com/fine/comments/commentRss/126370.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/fine/services/trackbacks/126370.html</trackback:ping><description><![CDATA[
		<div style="MARGIN-TOP: 10px; MARGIN-LEFT: 15px; OVERFLOW: auto">
				<table width="100%">
						<tbody>
								<tr>
										<td>
												<font face="Arial">
														<p>
																<font face="Arial">让WebLogic先识别该应用的包�Q?/font>
														</p>
														<p>
																<font face="Arial">修改的方式就是在自己的应用中WEB-INF中新建weblogic.xml文�g</font>
														</p>
														<p>
																<font face="Arial">&lt;!--CTYPE weblogic-web-app PUBLIC "-//BEA Systems, Inc.//DTD Web Application 8.1//EN" "http://www.bea.com/servers/wls810/dtd/weblogic810-web-jar.dt--&gt;</font>
														</p>
														<font face="Arial">
																<div   id="n9t7vfn"   class="code_title">xml 代码</div>
																<div   id="jdn9nxn"   class="bar">
																</div>
																<div   id="7zthth9"   class="dp-highlighter">
																		<ol class="dp-xml">
																				<li id="17hdr99"    class="alt">
																						<span>
																								<span>&lt;!DOCTYPE weblogic-web-app PUBLIC "-//BEA Systems, Inc.//DTD Web Application 8.1//EN" "http://www.bea.com/servers/wls810/dtd/weblogic810-web-jar.dtd"</span>
																								<span id="199r9z7"    class="tag">&gt;</span>
																								<span>  </span>
																						</span>
																				</li>
																				<li id="1ft7r79"    class="">
																						<span>  </span>
																				</li>
																				<li id="n979ff9"    class="alt">
																						<span>
																						</span>
																						<span id="1r7b99j"    class="tag">&lt;</span>
																						<span id="9l9hn9d"    class="tag-name">weblogic-web-app</span>
																						<span id="tvn9919"    class="tag">&gt;</span>
																						<span>  </span>
																				</li>
																				<li id="9h9t7ll"    class="">
																						<span>  </span>
																						<span id="pb99zh9"    class="tag">&lt;</span>
																						<span id="jjftvfp"    class="tag-name">jsp-descriptor</span>
																						<span id="vn7jp9f"    class="tag">&gt;</span>
																						<span>  </span>
																				</li>
																				<li id="btpdppp"    class="alt">
																						<span>    </span>
																						<span id="rzt1dzx"    class="tag">&lt;</span>
																						<span id="1pj1r9j"    class="tag-name">jsp-param</span>
																						<span id="f9pl9p9"    class="tag">&gt;</span>
																						<span>  </span>
																				</li>
																				<li id="7hlr97f"    class="">
																						<span>      </span>
																						<span id="nh7pb9r"    class="tag">&lt;</span>
																						<span id="79lvp9l"    class="tag-name">param-name</span>
																						<span id="x9xrjvt"    class="tag">&gt;</span>
																						<span>pageCheckSeconds</span>
																						<span id="xxb7l97"    class="tag">&lt;/</span>
																						<span id="r79hblt"    class="tag-name">param-name</span>
																						<span id="r999jtz"    class="tag">&gt;</span>
																						<span>  </span>
																				</li>
																				<li id="x99fhft"    class="alt">
																						<span>      </span>
																						<span id="vphxpx9"    class="tag">&lt;</span>
																						<span id="9xz99rb"    class="tag-name">param-value</span>
																						<span id="dvhvpfn"    class="tag">&gt;</span>
																						<span>0</span>
																						<span id="bvx7jf7"    class="tag">&lt;/</span>
																						<span id="r9l9fft"    class="tag-name">param-value</span>
																						<span id="1fr9z9b"    class="tag">&gt;</span>
																						<span>  </span>
																				</li>
																				<li id="n7vx9fz"    class="">
																						<span>    </span>
																						<span id="vf7jf9x"    class="tag">&lt;/</span>
																						<span id="lxr997l"    class="tag-name">jsp-param</span>
																						<span id="phl7jrh"    class="tag">&gt;</span>
																						<span>  </span>
																				</li>
																				<li id="b79bnvt"    class="alt">
																						<span>    </span>
																						<span id="x99dn9f"    class="tag">&lt;</span>
																						<span id="xz7jnt9"    class="tag-name">jsp-param</span>
																						<span id="n979zph"    class="tag">&gt;</span>
																						<span>  </span>
																				</li>
																				<li id="bvf79dx"    class="">
																						<span>      </span>
																						<span id="hrv9nnd"    class="tag">&lt;</span>
																						<span id="bnhdxvb"    class="tag-name">param-name</span>
																						<span id="7hb9x9b"    class="tag">&gt;</span>
																						<span>encoding</span>
																						<span id="zbl9jpx"    class="tag">&lt;/</span>
																						<span id="997x9j9"    class="tag-name">param-name</span>
																						<span id="rtl1jr9"    class="tag">&gt;</span>
																						<span>  </span>
																				</li>
																				<li id="7vnd9bn"    class="alt">
																						<span>      </span>
																						<span id="r9d9n99"    class="tag">&lt;</span>
																						<span id="7dxdft7"    class="tag-name">param-value</span>
																						<span id="n779rh9"    class="tag">&gt;</span>
																						<span>UTF-8</span>
																						<span id="r7lpr9p"    class="tag">&lt;/</span>
																						<span id="lv79pf9"    class="tag-name">param-value</span>
																						<span id="z71bf9n"    class="tag">&gt;</span>
																						<span>  </span>
																				</li>
																				<li id="v9zj79v"    class="">
																						<span>    </span>
																						<span id="9dx1d79"    class="tag">&lt;/</span>
																						<span id="bp9blj9"    class="tag-name">jsp-param</span>
																						<span id="hr77x7z"    class="tag">&gt;</span>
																						<span>  </span>
																				</li>
																				<li id="f7ztvtd"    class="alt">
																						<span>  </span>
																						<span id="79btndx"    class="tag">&lt;/</span>
																						<span id="xztptjp"    class="tag-name">jsp-descriptor</span>
																						<span id="19fplrp"    class="tag">&gt;</span>
																						<span>  </span>
																				</li>
																				<li id="r7b7d9v"    class="">
																						<span>  </span>
																						<span id="f9vxbz9"    class="tag">&lt;</span>
																						<span id="h79nnd9"    class="tag-name">container-descriptor</span>
																						<span id="f97pj9d"    class="tag">&gt;</span>
																						<span id="zl9zbpp"    class="comments">&lt;!-- using web based class load order --&gt;</span>
																						<span>  </span>
																				</li>
																				<li id="19t99j9"    class="alt">
																						<span>    </span>
																						<span id="r7pp99j"    class="tag">&lt;</span>
																						<span id="p99r9p7"    class="tag-name">prefer-web-inf-classes</span>
																						<span id="7t99hfl"    class="tag">&gt;</span>
																						<span>true</span>
																						<span id="jp799p7"    class="tag">&lt;/</span>
																						<span id="dz779rr"    class="tag-name">prefer-web-inf-classes</span>
																						<span id="7fjhbph"    class="tag">&gt;</span>
																						<span>  </span>
																				</li>
																				<li id="rx9xzx7"    class="">
																						<span>  </span>
																						<span id="jtz79jb"    class="tag">&lt;/</span>
																						<span id="hj77dzt"    class="tag-name">container-descriptor</span>
																						<span id="jj97p99"    class="tag">&gt;</span>
																						<span>  </span>
																				</li>
																				<li id="bdx97lv"    class="alt">
																						<span>
																						</span>
																						<span id="99p7lzh"    class="tag">&lt;/</span>
																						<span id="7nzfpxv"    class="tag-name">weblogic-web-app</span>
																						<span id="zjz9p9j"    class="tag">&gt;</span>
																						<span>  </span>
																				</li>
																		</ol>
																</div>
																<p class="alt">
																		<br />     &lt;charset-params&gt;<br />      &lt;input-charset&gt;<br />        &lt;resource-path&gt;/&lt;/resource-path&gt;<br />        &lt;java-charset-name&gt;GBK&lt;/java-charset-name&gt;<br />      &lt;/input-charset&gt;<br />     &lt;/charset-params&gt;<br /> &lt;jsp-descriptor&gt;      <br /> &lt;jsp-param&gt;<br /> &lt;param-name&gt;compilerSupportsEncoding&lt;/param-name&gt;<br /> &lt;param-value&gt;true&lt;/param-value&gt;<br /> &lt;/jsp-param&gt;<br /> &lt;/jsp-descriptor&gt;</p>
														</font>
												</font>
										</td>
								</tr>
						</tbody>
				</table>
		</div>
		<p>
				<span id="pzp7tlj"    class="tag-name">
				</span> </p>
<img src ="http://www.tkk7.com/fine/aggbug/126370.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/fine/" target="_blank">Peter Pan</a> 2007-06-26 16:44 <a href="http://www.tkk7.com/fine/archive/2007/06/26/126370.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>WebLogic 8.1集群配置及应用�ȝ��(�? </title><link>http://www.tkk7.com/fine/archive/2007/06/19/125120.html</link><dc:creator>Peter Pan</dc:creator><author>Peter Pan</author><pubDate>Tue, 19 Jun 2007 06:46:00 GMT</pubDate><guid>http://www.tkk7.com/fine/archive/2007/06/19/125120.html</guid><wfw:comment>http://www.tkk7.com/fine/comments/125120.html</wfw:comment><comments>http://www.tkk7.com/fine/archive/2007/06/19/125120.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.tkk7.com/fine/comments/commentRss/125120.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/fine/services/trackbacks/125120.html</trackback:ping><description><![CDATA[
		<strong>WebLogic 8.1集群配置及应用�ȝ��(�?    </strong>
		<span id="b7z9hx9"    class="oblog_text">
		</span>
		<table cellspacing="0" cellpadding="0" width="100%" border="0">
				<tbody>
						<tr>
								<td>
										<br />
								</td>
						</tr>
				</tbody>
		</table>
		<span id="vf99p7l"    class="oblog_text">
				<p>1、基本概忉|�ȝ��<br />a. 什么是Domain和Server<br />    Domain是WebLogic Server实例的基本管理单元。所谓Domain���是�Q�由配置为Administrator Server的WebLogic Server实例���理的逻辑单元�Q�这个单元是有所有相兌���源的集合�?br />    Server是一个相对独立的�Q��ؓ实现某些特定功能而结合在一��L��单元�?br />b. Domain and Server的关�p?br />一个Domain 可以包含一个或多个WebLogic Server实例�Q�甚��x��Server集群。一个Domain中有一个且只能有一个Server 担�Q���理Server的功能，其它的Server具体实现一个特定的逻辑功能�?/p>
				<p>c. WebLogic集群的体�pȝ���?br />   1. 单层混合型的集群架构<br />    �q�种架构���所有的Web应用以及相关的服务应用全部置于集���中的单一WLS实例中，�q�种架构的优势在于：<br />   &gt;&gt; 易于���理<br />   &gt;&gt; 灉|��的负载��^衡机�?br />   &gt;&gt; 更强的安全控�?br />   2. 多层�l�构的集���架�?br />    �q�种架构使用两个WLS集群�Q�一个放�|�表静态内容和集群Servlet�Q�另一个放�|�集���EJB。一般应用于下面�q�些情况�Q?br />   &gt;&gt; 在负载��^衡机刉���要调用集���EJB中的�Ҏ���Ӟ��<br />   &gt;&gt; 在提供内容与提供对象的服务之间需要更大的机动性时�Q?br />   &gt;&gt; 在需要更高的�pȝ���E�_��性时�Q?/p>
				<p>d. 配置集群应用的必要条�?br />   1. 集群中的所有Server必须位于同一�|�段�Q��ƈ且必���L��IP�q�播(UDP)可到辄���<br />   2. 集群中的所有Server必须使用相同的版�?包括Service Pack<br />   3. 集群中的Server必须使用�怹�的静态IP地址。动态IP地址分配不能用于集群环境。如果服务器位于防火墙后面，而客��h��位于防火墙外面，那么服务器必���L��公共的静态IP地址�Q�只有这��P��客户端才能访问服务器<br />   4. 要以CLUSTER方式�q�行�Q�必���L��包含CLUSTER许可的LICENSE才行.</p>
				<p>2、集���配�|��ȝ��<br />a. 配置集群可以在新建域(Domain)的时候进行，也可以在一个现有的域的基础上进�?br />b. 在没有集���的环境下，新徏一个域时可以将���理服务�?Admin Server)作�ؓ事务处理服务器��用，否则���理服务器应该指向集���的Admin Server所在的机器�?br />c. 启动Managed Server的方法有两种�Q�一�U�是以命令行的方式，�? startManagedWebLoigc managedserver <a href="http://adminserver_address/">http://adminserver_address/</a>�Q�第二种是在WebLogic���理控制��C��启动此时必须先启动NodeManager�Q��ƈ且在一台机器上的多个Server只需要启一�?NodeManager实例。两�U�启动方式下Weblogic的后台输出是不一��L���Q�前者输出到控制台窗口，后者输出到ModeManager目录下的日志文�g中，一个Server一个日志文件�?br />d. 必须通过HttpClusterServlet实现集群的自动请求�{发，也就是说必须创徏一个Server作�ؓ代理服务�?proxy Server)�?br />   在代理服务器上部�|�缺省的Web应用�Q�该应用的WEB-INF目录包括下两个文�Ӟ��其中web.xml内容如下�Q?br /> &lt;?xml version="1.0" encoding="UTF-8"?&gt;<br />&lt;!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "<a &gt;<br /> &lt;web-app id="WebApp_ID"&gt;<br />     &lt;display-name&gt;NJGS Web Application&lt;/display-name&gt;<br />     <br />     &lt;servlet&gt;<br />      &lt;servlet-name&gt;HttpClusterServlet&lt;/servlet-name&gt;<br />      &lt;servlet-class&gt;<br />            weblogic.servlet.proxy.HttpClusterServlet<br />      &lt;/servlet-class&gt;<br />      &lt;init-param&gt;<br />          &lt;param-name&gt;WebLogicCluster&lt;/param-name&gt;<br />          &lt;param-value&gt;<br />            localhost:7011|localhost:7012|localhost:7013<br />          &lt;/param-value&gt;<br />      &lt;/init-param&gt;<br />      <br />      &lt;init-param&gt;<br />    &lt;param-name&gt;DebugConfigInfo&lt;/param-name&gt;<br />    &lt;param-value&gt;ON&lt;/param-value&gt;<br />      &lt;/init-param&gt;</p>
				<p>     &lt;/servlet&gt;<br />     <br />     &lt;servlet-mapping&gt;<br />       &lt;servlet-name&gt;HttpClusterServlet&lt;/servlet-name&gt;<br />       &lt;url-pattern&gt;/&lt;/url-pattern&gt;<br />     &lt;/servlet-mapping&gt;<br />     <br />      &lt;servlet-mapping&gt;<br />       &lt;servlet-name&gt;HttpClusterServlet&lt;/servlet-name&gt;<br />       &lt;url-pattern&gt;*.jsp&lt;/url-pattern&gt;<br />     &lt;/servlet-mapping&gt;<br />     <br />     <br />     &lt;servlet-mapping&gt;<br />       &lt;servlet-name&gt;HttpClusterServlet&lt;/servlet-name&gt;<br />       &lt;url-pattern&gt;*.html&lt;/url-pattern&gt;<br />     &lt;/servlet-mapping&gt;<br />     <br />      &lt;servlet-mapping&gt;<br />       &lt;servlet-name&gt;HttpClusterServlet&lt;/servlet-name&gt;<br />       &lt;url-pattern&gt;*.htm&lt;/url-pattern&gt;<br />     &lt;/servlet-mapping&gt;<br />   <br />&lt;/web-app&gt;<br /> <br />   weblogic.xml文�g的内容如下： <br />&lt;?xml version="1.0" encoding="UTF-8"?&gt;<br />&lt;!DOCTYPE weblogic-web-app PUBLIC "-//BEA Systems, Inc.//DTD Web Application 8.1//EN" "<a &gt;<br />&lt;weblogic-web-app&gt;<br /> &lt;context-root&gt;/&lt;/context-root&gt;<br />&lt;/weblogic-web-app&gt;<br />注意上述context-root的内容必���Mؓ /</p>
				<p>e. Web应用向集���上部��v�Ӟ��必须选择部��v到整个集���或者集���中的某些服务器�Q�Http��h��的�{发由代理服务器自动处理�?br />f. 可以写个���单的��面�Q��ƈ且用JMeter模拟上百个请求同时访问该��面�?���试集群功能。请求的格式�?<a href="http://proxyserver_address/">http://proxyserver_address/</a>应用�?���试jps��面<br /><br />E:\bea\user_projects\domains\mydomain&gt;startmanagedweblogic managed2 <a href="http://IP:7001">http://IP:7001</a></p>
				<p>cd </p>
				<p>startweblogic</p>
				<p>startmanagedweblogic managed2 <a href="http://IP:7001">http://IP:7001</a><br /></p>
		</span>
<img src ="http://www.tkk7.com/fine/aggbug/125120.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/fine/" target="_blank">Peter Pan</a> 2007-06-19 14:46 <a href="http://www.tkk7.com/fine/archive/2007/06/19/125120.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>maven</title><link>http://www.tkk7.com/fine/archive/2007/06/12/123661.html</link><dc:creator>Peter Pan</dc:creator><author>Peter Pan</author><pubDate>Tue, 12 Jun 2007 08:58:00 GMT</pubDate><guid>http://www.tkk7.com/fine/archive/2007/06/12/123661.html</guid><wfw:comment>http://www.tkk7.com/fine/comments/123661.html</wfw:comment><comments>http://www.tkk7.com/fine/archive/2007/06/12/123661.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.tkk7.com/fine/comments/commentRss/123661.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/fine/services/trackbacks/123661.html</trackback:ping><description><![CDATA[
		<pre>
				<a >http://maven.apache.org/plugins/index.html</a>
				<br />mvn archetype:create<br />   <br /><br /><br /><br /><pre>mvn archetype:create 
  -DgroupId=[your project's group id]
  -DartifactId=[your project's artifact id]
  -DarchetypeArtifactId=maven-archetype-quickstart<br /><pre>mvn archetype:create 
  -DgroupId=[your project's group id]
  -DartifactId=[your project's artifact id]
  -DarchetypeArtifactId=maven-archetype-j2ee-simple<br /><pre>mvn archetype:create 
  -DgroupId=[your project's group id]
  -DartifactId=[your project's artifact id]
  -DarchetypeArtifactId=maven-archetype-webapp<br /><pre>mvn archetype:create 
  -DgroupId=[your project's group id]
  -DartifactId=[your project's artifact id]
  -DarchetypeArtifactId=maven-archetype-site-simple<br /><pre>mvn archetype:create 
  -DgroupId=[your project's group id]
  -DartifactId=[your project's artifact id]
  -DarchetypeArtifactId=maven-archetype-site<br /><br /><pre>mvn archetype:create 
  -DgroupId=[your project's group id]
  -DartifactId=[your project's artifact id]
  -DarchetypeArtifactId=maven-archetype-portlet<br /><pre>mvn archetype:create 
  -DgroupId=[your project's group id]
  -DartifactId=[your project's artifact id]
  -DarchetypeArtifactId=maven-archetype-mojo<br /><pre>mvn archetype:create 
  -DgroupId=[your project's group id]
  -DartifactId=[your project's artifact id]
  -DarchetypeArtifactId=maven-archetype-archetype</pre></pre></pre></pre></pre></pre></pre></pre></pre>
<img src ="http://www.tkk7.com/fine/aggbug/123661.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/fine/" target="_blank">Peter Pan</a> 2007-06-12 16:58 <a href="http://www.tkk7.com/fine/archive/2007/06/12/123661.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>IntelliJ IDEA  性能调整</title><link>http://www.tkk7.com/fine/archive/2007/05/28/120420.html</link><dc:creator>Peter Pan</dc:creator><author>Peter Pan</author><pubDate>Mon, 28 May 2007 03:32:00 GMT</pubDate><guid>http://www.tkk7.com/fine/archive/2007/05/28/120420.html</guid><wfw:comment>http://www.tkk7.com/fine/comments/120420.html</wfw:comment><comments>http://www.tkk7.com/fine/archive/2007/05/28/120420.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.tkk7.com/fine/comments/commentRss/120420.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/fine/services/trackbacks/120420.html</trackback:ping><description><![CDATA[
		<table height="20" cellspacing="0" cellpadding="0" width="100%" border="0">
				<tbody>
						<tr>
								<td class="ContentParaTitle">
										<strong>IntelliJ IDEA 性能调整</strong>
								</td>
						</tr>
				</tbody>
		</table>
		<table cellspacing="0" cellpadding="0" width="700" border="0">
				<tbody>
						<tr>
								<td class="ContentPara">
										<p>IDEA 6.0已经发布�Q�好多�h抱怨反应速度慢，内存消耗大。IDEA 6.0增加了不���新�Ҏ��，�E�序也更大，内存占用肯定也会提高。在�q�篇文章我们��x��讨一下这斚w��的问题，通过相关的设�|�，让你的IDEA快�v来，更稳定�?br />     IntelliJ IDEA是Java�E�序�Q�所以性能调整因从JVM和程序两斚w��考虑。对于JVM的调��_��可能个�h看法都不一��P���q�样我们�l�出一个推荐方案，然后�l�你做一说明�Q�你也可以在此基���上做更个性的修改。下面的截图是根据“IDEA VM Options”插件做的，该插件可以修改idea.exe.vmoptions文�g内容�Q�即使升�U�版本也不用担心�?<br />     打开讄���面板�Q�选择“IDEA VM Options”，按照下图然后输入以下参数�Q?</p>
								</td>
						</tr>
				</tbody>
		</table>
		<table cellspacing="0" cellpadding="0" bgcolor="#999999" border="0">
				<tbody>
						<tr>
								<td class="imageTable">
										<img src="http://www.jetmaven.net/contents/documents/p_image/p_ij_jvm_parameters.png" />
								</td>
						</tr>
				</tbody>
		</table>
		<table cellspacing="0" cellpadding="0" width="700" border="0">
				<tbody>
						<tr>
								<td class="ContentPara">
										<p>-Xms256m<br />-Xmx384m<br />-XX:MaxPermSize=128m<br />-XX:NewRatio=4<br />-Xss128k<br />-Dsun.awt.keepWorkingSetOnMinimize=true<br />-server<br />下面我们做一些解释： -Xms256m讄���初时的内存数�Q�你需要设�|�一个合理的��|�� 增加该值可以提高Java�E�序的启动速度。如果你的内存够大，�?G�Q�可以设�|�到400m�?br />-Xmx384m讄���最大内存数�Q�提高该��|��可以减少内存Garage攉���的频率，提高�E�序性能�?br />-Dsun.awt.keepWorkingSetOnMinimize=true可以让IDEA最���化��C�Q务栏时依然保持以占有的内存，当你重新回到IDEA�Q�能够被快速显�C�，而不是由灰白的界面逐渐昄���整个界面�Q�加快回复到原界面的速度�?br />-server控制内存garage方式�Q�这样你无需在花一��C��分钟�{�待内存garage的收集�?br /><br />     接下来就是IDEA�E�序的设�|�，我们�����采用下图的设�|�： </p>
								</td>
						</tr>
				</tbody>
		</table>
		<table cellspacing="0" cellpadding="0" bgcolor="#999999" border="0">
				<tbody>
						<tr>
								<td class="imageTable">
										<img src="http://www.jetmaven.net/contents/documents/p_image/p_ij_application_parameter.png" />
								</td>
						</tr>
				</tbody>
		</table>
		<table cellspacing="0" cellpadding="0" width="700" border="0">
				<tbody>
						<tr>
								<td class="ContentPara">
										<p>取消“Synchronize file on frame activation”和“Save files on frame deactivation”的选择。在IDEA中，采用多线�E�读写文�Ӟ��但线�E�写�Q�而且���盘��d��非常耗费旉����Q�所以我们徏议取消这两个选项�Q�否则在IDEA和其他程序切换时�Q�你会发现磁盘操作比较频�J�。同时我们选择“Save files automatically”，�q�将其设�|��ؓ30�U�，�q�样IDEA依然可以自动保持文�g。做以上的设�|�，可能有一点不方便。如我们�~�辑一个jsp文�g�Q�然后切换到���览器刷斎ͼ�获得最新的信息。但是在切换到浏览器�Ӟ��IDEA���不会自动保存，所有信息不是最新的。所以在每次切换�Ӟ��你需要按下Ctrl+S�Q�保存文件。这样你需要了解哪些文件被更改了，�l�这些文件一个标识�?在IDEA中，你需要做以下讄���, �q�样被修改的文�g会以*��h��识出来，你可以及时保存相关的文�g�?</p>
								</td>
						</tr>
				</tbody>
		</table>
		<table cellspacing="0" cellpadding="0" bgcolor="#999999" border="0">
				<tbody>
						<tr>
								<td class="imageTable">
										<img src="http://www.jetmaven.net/contents/documents/p_image/p_ij_modified_mark.png" />
								</td>
						</tr>
				</tbody>
		</table>
		<table cellspacing="0" cellpadding="0" width="700" border="0">
				<tbody>
						<tr>
								<td class="ContentPara">
										<p>
												<strong>�ȝ���Q?/strong>通过以上的设�|�，我们�怿�会提高IDEA的性能。当然这不表�C�IDEA的默认配�|�是错误的，���如同数据库软�g一��P��提供了一个标准的配置�Q�具体的一些性能调整可能要根据实际情�늡�定�?/p>
								</td>
						</tr>
				</tbody>
		</table>
<img src ="http://www.tkk7.com/fine/aggbug/120420.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/fine/" target="_blank">Peter Pan</a> 2007-05-28 11:32 <a href="http://www.tkk7.com/fine/archive/2007/05/28/120420.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>JProfiler</title><link>http://www.tkk7.com/fine/archive/2007/05/07/115671.html</link><dc:creator>Peter Pan</dc:creator><author>Peter Pan</author><pubDate>Mon, 07 May 2007 02:57:00 GMT</pubDate><guid>http://www.tkk7.com/fine/archive/2007/05/07/115671.html</guid><wfw:comment>http://www.tkk7.com/fine/comments/115671.html</wfw:comment><comments>http://www.tkk7.com/fine/archive/2007/05/07/115671.html#Feedback</comments><slash:comments>3</slash:comments><wfw:commentRss>http://www.tkk7.com/fine/comments/commentRss/115671.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/fine/services/trackbacks/115671.html</trackback:ping><description><![CDATA[&nbsp;&nbsp;&nbsp;&nbsp; 摘要: JProfiler.v4.2.2+注册�?		2006�q?2�?6�?星期�?21:53
		
				
						
								
										
												JProfiler是一个全功能的Java剖析工具�Q�profiler�Q�，专用於分析J2SE和J2EE应用�E�式。它把CPU、线�E�和记忆体的剖析�l�合在一个强大的应用中。JProfiler可提供许多IDE整合�?..&nbsp;&nbsp;<a href='http://www.tkk7.com/fine/archive/2007/05/07/115671.html'>阅读全文</a><img src ="http://www.tkk7.com/fine/aggbug/115671.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/fine/" target="_blank">Peter Pan</a> 2007-05-07 10:57 <a href="http://www.tkk7.com/fine/archive/2007/05/07/115671.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>apache+tomcat配置负蝲均衡</title><link>http://www.tkk7.com/fine/archive/2007/04/05/108752.html</link><dc:creator>Peter Pan</dc:creator><author>Peter Pan</author><pubDate>Thu, 05 Apr 2007 09:50:00 GMT</pubDate><guid>http://www.tkk7.com/fine/archive/2007/04/05/108752.html</guid><wfw:comment>http://www.tkk7.com/fine/comments/108752.html</wfw:comment><comments>http://www.tkk7.com/fine/archive/2007/04/05/108752.html#Feedback</comments><slash:comments>1</slash:comments><wfw:commentRss>http://www.tkk7.com/fine/comments/commentRss/108752.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/fine/services/trackbacks/108752.html</trackback:ping><description><![CDATA[&nbsp;&nbsp;&nbsp;&nbsp; 摘要: 0�Q?环境说明
						
						       Apache  :apache_2.0.55     1 �?						       Tomcat:  apache-tomcat-5.5.17 (zip�? 2�?						       mod_jk:: mod_jk-apache-2.0.55.so  1�?						
								�W�一部分�Q�负载均�?						...&nbsp;&nbsp;<a href='http://www.tkk7.com/fine/archive/2007/04/05/108752.html'>阅读全文</a><img src ="http://www.tkk7.com/fine/aggbug/108752.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/fine/" target="_blank">Peter Pan</a> 2007-04-05 17:50 <a href="http://www.tkk7.com/fine/archive/2007/04/05/108752.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>Apache和Tomcat整合</title><link>http://www.tkk7.com/fine/archive/2007/04/05/108728.html</link><dc:creator>Peter Pan</dc:creator><author>Peter Pan</author><pubDate>Thu, 05 Apr 2007 08:31:00 GMT</pubDate><guid>http://www.tkk7.com/fine/archive/2007/04/05/108728.html</guid><wfw:comment>http://www.tkk7.com/fine/comments/108728.html</wfw:comment><comments>http://www.tkk7.com/fine/archive/2007/04/05/108728.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.tkk7.com/fine/comments/commentRss/108728.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/fine/services/trackbacks/108728.html</trackback:ping><description><![CDATA[Apache和Tomcat�q�接的方法大致有JK1.x�Q?JK2�Q?mod_webapp三种connector可以使用�Q�下面简单说明一�?br />  Apache2.0.50 + Tomcat5.0.29 �Q?mod_jk2的连接方法，环境为windows XP
<p>1、下载：<br />       apache2.0.50�?a >http://apache.org</a>下蝲<br />       tomcat5.0.28�?a >http://jakarta.apache.org</a>下蝲<br />       module_jk2�?a >http://jakarta.apache.org</a>下蝲</p><br /><p>2<br />      Apache到D:\Apache Group\Apache2<br />      Tomcat到E:\work\jakarta-tomcat-5.0.28<br />      module文�g为jakarta-tomcat-connectors-jk2.0.4-win32-apache2.0.49.zip 解压�~�，���modules/mod_jk2.so拯����?br />     D:\Apache Group\Apache2\modules下，conf/workers2.properties.sample拯���到D:\Apache Group\Apache2\conf下，<br />     �q�改名�ؓworker1.properties<br />3、修改D:\Apache Group\Apache2\conf\httpd.conf�Q�增�?br />     LoadModule jk2_module "modules/mod_jk2.so" <br />     JkSet config.file "conf/workers2.properties"<br />    <br />    Apache配置完毕�Q�重新启动Apache<br />4、tomcat默认支持ajp1.3的jk2�q�接�Q�所以只需要配�|�apache���可以，剩下的就是将需要访问的目录增加�?br />     worker2.properties���可以了�Q�默认�ؓ<br />[shm]<br />info=Scoreboard. Requried for reconfiguration and status with multiprocess servers.<br />file=anon</p><p># Defines a load balancer named lb. Use even if you only have one machine.<br />[lb:lb]</p><p># Example socket channel, override port and host.<br />[channel.socket:localhost:8009]<br />port=8009<br />host=127.0.0.1</p><p># define the worker<br />[ajp13:localhost:8009]<br />channel=channel.socket:localhost:8009<br />group=lb</p><p># Map the Tomcat examples webapp to the Web server uri space<br />[uri:/examples/*]<br />group=lb</p><p>[status:]<br />info=Status worker, displays runtime information</p><p>[uri:/jkstatus/*]<br />info=The Tomcat /jkstatus handler<br />group=status:<br />[shm]<br />info=Scoreboard. Requried for reconfiguration and status with multiprocess servers.<br />file=D:/Apache Group/Apache2/logs/jk2.shm<br />size=1048576</p><p>需要修改一下apache的默认目录，然后我增加了两个目录/servlets-examples�?axis�Q�得到如�?/p><p># Defines a load balancer named lb. Use even if you only have one machine.<br />[lb:lb]</p><p># Example socket channel, override port and host.<br />[channel.socket:localhost:8009]<br />port=8009<br />host=localhost</p><p># define the worker<br />[ajp13:localhost:8009]<br />channel=channel.socket:localhost:8009<br />group=lb</p><p># Map the Tomcat examples webapp to the Web server uri space<br />[uri:/jsp-examples/*]<br />group=lb<br />[uri:/bbs/*]<br />group=lb<br />[uri:/servlets-examples/*]<br />group=lb<br />[uri:/axis/*]<br />group=lb<br />[status:]<br />info=Status worker, displays runtime information</p><p>[uri:/jkstatus/*]<br />info=The Tomcat /jkstatus handler<br />group=status:</p><p>[uri:/*.jsp]<br />worker=ajp13:localhost:8009<br />     <br />重新启动apache,tomcat<br />讉K��<br /><a href="http://localhost/jkstatus/">http://localhost/jkstatus/</a><br /><a href="http://localhost/servlets-examples/">http://localhost/servlets-examples/</a><br /><a href="http://localhost/axis/">http://localhost/axis/</a><br /><a href="http://localhost:8080/servlets-examples/">http://localhost:8080/servlets-examples/</a><br /><a href="http://localhost:8080/axis">http://localhost:8080/axis</a><br />看一下结果，如果�q�要增加新的目录�Q�只要照上面操作卛_��</p><img src ="http://www.tkk7.com/fine/aggbug/108728.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/fine/" target="_blank">Peter Pan</a> 2007-04-05 16:31 <a href="http://www.tkk7.com/fine/archive/2007/04/05/108728.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>JavaBean中Property命名不规范出��C��问题</title><link>http://www.tkk7.com/fine/archive/2007/03/16/104294.html</link><dc:creator>Peter Pan</dc:creator><author>Peter Pan</author><pubDate>Fri, 16 Mar 2007 08:20:00 GMT</pubDate><guid>http://www.tkk7.com/fine/archive/2007/03/16/104294.html</guid><wfw:comment>http://www.tkk7.com/fine/comments/104294.html</wfw:comment><comments>http://www.tkk7.com/fine/archive/2007/03/16/104294.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.tkk7.com/fine/comments/commentRss/104294.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/fine/services/trackbacks/104294.html</trackback:ping><description><![CDATA[
		<p>JavaBean中Property命名不规范出��C��问题�Q?br />public class StockGuessInfo {</p>
		<p> private String SN;</p>
		<p> private String A_NUM;<br /> public String getA_NUM() {<br />  return A_NUM;<br /> }</p>
		<p> public void setA_NUM(String a_num) {<br />  A_NUM = a_num;<br /> }<br />�?br /><br /><font color="#000080">�q�段代码用Apache的Common中的Util反射���得不到预期的结�?br />&lt;bean:write name="stockGuessActionForm" property="A_NUM" /&gt;   出现错误<br />&lt;bean:write name="stockGuessActionForm" property="a_NUM" /&gt;   可以得到�l�果<br /><br />//Apache的Common中的Util要求javaBean中Property变量要求两个字母要大写都大写�Q�小写都���写�Q�否则反���失�?br />NAME   成功<br />Name   ��p�|<br />NaME   ��p�|</font><br /><br /><br /><br />�Q�＝�Q�＝�Q�＝�Q�＝�Q�＝�Q�＝�Q�＝<br /><br />    public static BeanInfo getBeanInfo(Class&lt;?&gt; beanClass)<br /> throws IntrospectionException<br />    {<br /> if (!ReflectUtil.isPackageAccessible(beanClass)) {<br />     return (new Introspector(beanClass, null, USE_ALL_BEANINFO)).<font color="#ff0000">getBeanInfo</font>();<br /> }<br />...................<br />    }   <br />    private BeanInfo getBeanInfo() throws IntrospectionException {<br /> ..........</p>
		<p> PropertyDescriptor pds[] = <font color="#ff0000">getTargetPropertyInfo</font>();</p>
		<p> ......... <br />    }</p>
		<p> private PropertyDescriptor[] getTargetPropertyInfo() {<br /> ..........<br /> if{<br /> ............<br /> }else {</p>
		<p>     // Apply some reflection to the current class.</p>
		<p>     // First get an array of all the public methods at this level<br />     Method methodList[] = getPublicDeclaredMethods(beanClass);</p>
		<p>     // Now analyze each method.<br />     for (int i = 0; i &lt; methodList.length; i++) {<br />         Method method = methodList[i];<br />  if (method == null) {<br />      continue;<br />  }<br />         // skip static methods.<br />  int mods = method.getModifiers();<br />  if (Modifier.isStatic(mods)) {<br />      continue;<br />  }<br />         String name = method.getName();<br />         Class argTypes[] = method.getParameterTypes();<br />         Class resultType = method.getReturnType();<br />  int argCount = argTypes.length;<br />  PropertyDescriptor pd = null;</p>
		<p>  if (name.length() &lt;= 3 &amp;&amp; !name.startsWith(IS_PREFIX)) {<br />      // Optimization. Don't bother with invalid propertyNames.<br />      continue;<br />  }</p>
		<p>  try {</p>
		<p>             if (argCount == 0) {<br />          if (name.startsWith(GET_PREFIX)) {<br />              // Simple getter<br />============================文问题就出现在这�?decapitalize(name.substring(3)=========<br /><br />    pd = new <font color="#ff0000">PropertyDescriptor(decapitalize</font>(name.substring(3)),<br />      method, null);      <br />                 } else if (resultType == boolean.class &amp;&amp; name.startsWith(IS_PREFIX)) {<br />              // Boolean getter<br />                     pd = new PropertyDescriptor(decapitalize(name.substring(2)),<br />      method, null);<br />          }<br />............................................<br />   }</p>
		<p>   }</p>
		<p> public static String <font color="#ff0000">decapitalize</font>(String name) {<br /> if (name == null || name.length() == 0) {<br />     return name;<br /> }<br /> if (name.length() &gt; 1 &amp;&amp; Character.isUpperCase(name.charAt(1)) &amp;&amp;<br />   Character.isUpperCase(name.charAt(0))){<br />     return name;<br /> }<br /> char chars[] = name.toCharArray();<br /> chars[0] = Character.toLowerCase(chars[0]);<br /> return new String(chars);<br />    }<br /><font color="#ff0000">// pd = new PropertyDescriptor(decapitalize(name.substring(3)),<br />//���是在这里了decapitalize(name)中要求Property变量要求两个字母要大写都大写�Q�小写都���写�Q�否则反���失�?br />�Q�否则反���失�?/font></p>
<img src ="http://www.tkk7.com/fine/aggbug/104294.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/fine/" target="_blank">Peter Pan</a> 2007-03-16 16:20 <a href="http://www.tkk7.com/fine/archive/2007/03/16/104294.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>Jsp验证码的使用</title><link>http://www.tkk7.com/fine/archive/2007/03/13/103545.html</link><dc:creator>Peter Pan</dc:creator><author>Peter Pan</author><pubDate>Tue, 13 Mar 2007 07:42:00 GMT</pubDate><guid>http://www.tkk7.com/fine/archive/2007/03/13/103545.html</guid><wfw:comment>http://www.tkk7.com/fine/comments/103545.html</wfw:comment><comments>http://www.tkk7.com/fine/archive/2007/03/13/103545.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.tkk7.com/fine/comments/commentRss/103545.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/fine/services/trackbacks/103545.html</trackback:ping><description><![CDATA[
		<p>------------产生验证码图片的文�g-----image.jsp-------------------------------------------</p>
		<p>&lt;%@ page contentType="image/jpeg" import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*" %&gt;<br />&lt;%!<br />Color getRandColor(int fc,int bc){//�l�定范围获得随机颜色<br />        Random random = new Random();<br />        if(fc&gt;255) fc=255;<br />        if(bc&gt;255) bc=255;<br />        int r=fc+random.nextInt(bc-fc);<br />        int g=fc+random.nextInt(bc-fc);<br />        int b=fc+random.nextInt(bc-fc);<br />        return new Color(r,g,b);<br />        }<br />%&gt;<br />&lt;%<br />//讄�����面不缓�?br />response.setHeader("Pragma","No-cache");<br />response.setHeader("Cache-Control","no-cache");<br />response.setDateHeader("Expires", 0);</p>
		<p>// 在内存中创徏图象<br />int width=60, height=20;<br />BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);</p>
		<p>// 获取囑�Ş上下�?br />Graphics g = image.getGraphics();</p>
		<p>//生成随机�c?br />Random random = new Random();</p>
		<p>// 讑֮�背景�?br />g.setColor(getRandColor(200,250));<br />g.fillRect(0, 0, width, height);</p>
		<p>//讑֮�字体<br />g.setFont(new Font("Times New Roman",Font.PLAIN,18));</p>
		<p>//画边�?br />//g.setColor(new Color());<br />//g.drawRect(0,0,width-1,height-1);</p>
		<p>
				<br />// 随机产生155条干扰线�Q���图象中的认证码不易被其它�E�序探测�?br />g.setColor(getRandColor(160,200));<br />for (int i=0;i&lt;155;i++)<br />{<br />        int x = random.nextInt(width);<br />        int y = random.nextInt(height);<br />        int xl = random.nextInt(12);<br />        int yl = random.nextInt(12);<br />        g.drawLine(x,y,x+xl,y+yl);<br />}</p>
		<p>// 取随��Z�生的认证�?4位数�?<br />String sRand="";<br />for (int i=0;i&lt;4;i++){<br />    String rand=String.valueOf(random.nextInt(10));<br />    sRand+=rand;<br />    // ���认证码昄���到图象中<br />    g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));//调用函数出来的颜色相同，可能是因为种子太接近�Q�所以只能直接生�?br />    g.drawString(rand,13*i+6,16);<br />}</p>
		<p>// ���认证码存入SESSION<br />session.setAttribute("rand",sRand);</p>
		<p>
				<br />// 图象生效<br />g.dispose();</p>
		<p>// 输出图象到页�?br />ImageIO.write(image, "JPEG", response.getOutputStream());</p>
		<p>
				<br />%&gt; </p>
		<p>---------------使用验证码图片的文�g---------a.jsp------------------------------------</p>
		<p>&lt;%@ page contentType="text/html;charset=gb2312" %&gt;<br />&lt;!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"&gt;<br />&lt;html&gt;<br />&lt;head&gt;<br />&lt;title&gt;认证码输入页�?lt;/title&gt;<br />&lt;meta http-equiv="Content-Type" content="text/html; charset=gb2312"&gt;<br />&lt;META HTTP-EQUIV="Pragma" CONTENT="no-cache"&gt; <br />&lt;META HTTP-EQUIV="Cache-Control" CONTENT="no-cache"&gt; <br />&lt;META HTTP-EQUIV="Expires" CONTENT="0"&gt; <br />&lt;/head&gt;<br />&lt;body&gt;<br />&lt;form method=post action="check.jsp"&gt;<br />&lt;table&gt;<br />&lt;tr&gt;<br />&lt;td align=left&gt;�pȝ��产生的认证码�Q?lt;/td&gt;<br />&lt;td&gt;&lt;img border=0 src="image.jsp"&gt;&lt;/td&gt;<br />&lt;/tr&gt;<br />&lt;tr&gt;<br />&lt;td align=left&gt;输入上面的认证码�Q?lt;/td&gt;<br />&lt;td&gt;&lt;input type=text name=rand maxlength=4 value=""&gt;&lt;/td&gt;<br />&lt;/tr&gt;<br />&lt;tr&gt;<br />&lt;td colspan=2 align=center&gt;&lt;input type=submit value="提交�����?&gt;&lt;/td&gt;<br />&lt;/tr&gt;<br />&lt;/form&gt;<br />&lt;/body&gt;<br />&lt;/html&gt;</p>
		<p>-----------------验证的页�?---------check.jsp</p>
		<p>&lt;%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %&gt;<br />&lt;html&gt;<br />&lt;head&gt;<br />&lt;title&gt;认证码验证页�?lt;/title&gt;<br />&lt;meta http-equiv="Content-Type" content="text/html; charset=gb2312"&gt;<br />&lt;META HTTP-EQUIV="Pragma" CONTENT="no-cache"&gt; <br />&lt;META HTTP-EQUIV="Cache-Control" CONTENT="no-cache"&gt; <br />&lt;META HTTP-EQUIV="Expires" CONTENT="0"&gt; <br />&lt;/head&gt;</p>
		<p>&lt;body&gt;<br />&lt;% <br />String rand = (String)session.getAttribute("rand");<br />String input = request.getParameter("rand");<br />%&gt;<br />�pȝ��产生的认证码为： &lt;%= rand %&gt;&lt;br&gt;<br />您输入的认证码�ؓ�Q?&lt;%= input %&gt;&lt;br&gt;<br />&lt;br&gt;<br />&lt;%<br />  if (rand.equals(input)) {<br />%&gt;<br />&lt;font color=green&gt;输入相同�Q�认证成功！&lt;/font&gt;<br />&lt;%<br />  } else {<br />%&gt;<br />&lt;font color=red&gt;输入不同�Q�认证失败！&lt;/font&gt;<br />&lt;%<br />  }<br />%&gt;<br />&lt;/body&gt;<br />&lt;/html&gt;</p>
<img src ="http://www.tkk7.com/fine/aggbug/103545.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/fine/" target="_blank">Peter Pan</a> 2007-03-13 15:42 <a href="http://www.tkk7.com/fine/archive/2007/03/13/103545.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>逐渐���近100的算�?/title><link>http://www.tkk7.com/fine/archive/2006/11/24/83294.html</link><dc:creator>Peter Pan</dc:creator><author>Peter Pan</author><pubDate>Fri, 24 Nov 2006 08:14:00 GMT</pubDate><guid>http://www.tkk7.com/fine/archive/2006/11/24/83294.html</guid><wfw:comment>http://www.tkk7.com/fine/comments/83294.html</wfw:comment><comments>http://www.tkk7.com/fine/archive/2006/11/24/83294.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.tkk7.com/fine/comments/commentRss/83294.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/fine/services/trackbacks/83294.html</trackback:ping><description><![CDATA[
		<p>/**<br /> * 逐渐���近100的算�?br /> */</p>
		<p>public class Test1 {</p>
		<p> public static void main(String[] args) {<br />  // TODO 自动生成�Ҏ��存根<br />  //���法一<br />  /*int r=0;<br />  while(true){<br />   r+=(((100-r)/2)+1);<br />   if(r != 104)<br />   System.out.println(r);<br />  }*/<br />  //���法�?br />  float b = 0;<br />  float temp;<br />  while(true){<br />  float result = 100;<br />   //temp = (float) ((result - (b))*0.2);<br />  //result = result - temp;<br />  result = (float) (result - ((result - b)*0.2));<br />  b = result;<br />  //if((int)result != 100)<br />  System.out.println(result);<br />  }<br /> }<br />}</p>
<img src ="http://www.tkk7.com/fine/aggbug/83294.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/fine/" target="_blank">Peter Pan</a> 2006-11-24 16:14 <a href="http://www.tkk7.com/fine/archive/2006/11/24/83294.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>一个不错的Jstl�Q�JSP标准标签库）文章</title><link>http://www.tkk7.com/fine/archive/2006/09/04/67504.html</link><dc:creator>Peter Pan</dc:creator><author>Peter Pan</author><pubDate>Mon, 04 Sep 2006 01:14:00 GMT</pubDate><guid>http://www.tkk7.com/fine/archive/2006/09/04/67504.html</guid><wfw:comment>http://www.tkk7.com/fine/comments/67504.html</wfw:comment><comments>http://www.tkk7.com/fine/archive/2006/09/04/67504.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.tkk7.com/fine/comments/commentRss/67504.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/fine/services/trackbacks/67504.html</trackback:ping><description><![CDATA[                                    <strong>Java-JSTL�Q�JSP标准标签库）介绍 </strong><br />前言<br /><br />从JSP　1.1规范开始，JSP���支持在JSP中��用自定义标签了，自定义标�{�����q�泛使用造成了程序员重复定义�Q�这样就促成了JSTL�Q�JavaServer Pages Standard Tag Library�Q�的诞生�?br />因�ؓ工作中需要用到JSTL�Q�但�|�上却苦于找不到有关JSTL的中文资料，所以就有了�q�篇文章�?br /><br />JSTL����?br /><br />JSTL是一个不断完善的开放源代码的JSP标签库，是由apache的jakarta���组来维护的。JSTL只能�q�行在支持JSP1.2和Servlet2.3规范的容器上�Q�如tomcat 4.x。但是在卛_��推出的JSP 2.0中是作�ؓ标准支持的�?br />JSTL目前的最新版本�ؓ1.02�Q�最�l�发布版�?.0。JSTL包含两个部分�Q�标�{�ֺ�和EL�Q�Expression Language表达式语�a��Q�语�a�。标�{�ֺ�目前支持四种标签�Q� 标�{� URI 前缀 �C�Z�� <br />Core <a >http://java.sun.com/jstl/core</a> c &lt;c:tagname ...&gt; <br />XML processing <a >http://java.sun.com/jstl/xml</a> x &lt;x:tagname ...&gt; <br />I18N capable formatting <a >http://java.sun.com/jstl/fmt</a> fmt &lt;fmt:tagname ...&gt; <br />Database access (SQL) <a >http://java.sun.com/jstl/sql</a> sql &lt;sql:tagname ...&gt; <br /><br /><br />Core支持JSP中的一些基本的操作�Q?br />XML processing支持XML文档的处理；<br />I18N capable formatting支持对JSP��面的国际化�Q?br />Database access (SQL)支持JSP�Ҏ��据库的操作�?br /><br />�׃��本�h水��^有限�Q�本文仅介绍Core标签�Q�如有兴���，可一��h��讨其它三�U�标�{����使用与扩充�?br /><br />EL语言介绍<br /><br />EL语言是JSTL输出�Q�输入）一个JAVA表达式的表示形式�?br />在JSTL中，EL语言只能在属性��g��使用。EL语言只能通过建立表达�?{exp1}来进行调用。在属性��g��使用表达式有三种方式�?br /><br />1、 value属性包含一个表辑ּ�<br />&lt;some:tag value="${expr}"/&gt;<br />在这�U�情况下�Q�表辑ּ���D��计算出来�q�根据类型�{换规则赋值给value属性。比如：&lt;c:out value="${username}" /&gt;中的${username}���是一个EL�Q�它相当于JSP语句&lt;%=request.getAttribute(“username�?%&gt;�?lt;%=session.getAttribute(“username�?%&gt;<br /><br />2、 value属性包含一个或多个属性，�q�些属性被文本分割或围�l?br />&lt;some:tag value="some${expr}${expr}text${expr}"/&gt;<br />在这�U�情况下�Q�表辑ּ�从左到右�q�行计算�Q��ƈ���结果�{换�ؓ字符串型�Q�根据类型�{换规则）�Q��ƈ���结果赋值给value属�?br /><br />3、 value属性仅仅包含文�?br />&lt;some:tag value="sometext"/&gt;<br />在这�U�情况下�Q�字�W�串型属性value���根据类型�{换规则�{换�ؓ标签所希望的类型�?br /><br />EL语言的操作符<br />取得某个对象或集合中的属性�?br />��Z��获得集合中的属性，EL支持以下两种操作<br />1�Q� ���?操作�W�来获得有名字的属性。例如表辑ּ�${user.username}表明对象user的username属�?br />2�Q� ��用[]操作�W�来获得有名字或按数字排列的属性�?br />表达�?{user["username"]}和表辑ּ�${user. username }含义相同<br />表达�?{row[0]} 表明row集合的第一个条目�?br />在这里user是一个类的对象，它的属性username必须�W�合标准JavaBean的规范，卛_�����Mؓusername属性定义相应的getter、setter�Ҏ���?br /><br />Empty操作�W?�I�值检�?<br /><br />使用empty操作�W�来军_��对象、集合或字符串变量是否�ؓ�I�或null。例如：<br />${empty param.username}<br />如果request的参数列表中的username��gؓnull�Q�则表达式的��gؓtrue。 EL也可以直接��用比较操作符与null�q�行比较。如${param.firstname == null}�?br />比较操作�W� 操作符 描述 <br />==或eq 相等���查�?br />!=或ne 不等���查�?br />&lt;或lt ���于���查�?br />&gt;或gt 大于���查�?br />&lt;=或le ���于�{�于���查�?br />&gt;=或ge 大于�{�于���查�?br /><br />数字�q�算�W�与逻辑�q�算�W�均与JAVA语言相同�Q�不再列表�?br /><br />Core标签�?br /><br />1、 通用标签<br /><br />&lt;c:out&gt;<br />&lt;c:out&gt;标签用于在JSP中显�C�数据，它有如下属性 属 性 描 �q�W�是否必�� 缺省值�?br />value 输出的信息，可以是EL表达式或帔R�� 是 无 <br />default  value为空时显�C�Z��息 否 无�?br />escapeXml 为true则避开�Ҏ��的xml字符集 否 true <br /><br /><br /><br />例子: 您的用户名是: &lt;c:out value=�?{user.username}” default=”guest�?&gt; <br /><br />昄���用户的用户名�Q�如为空则显�C�guest<br />&lt;c:out value="${sessionScope.username}"/&gt; <br /><br />指定从session中获取username的值显�C�；<br />&lt;c:out value="${username}" /&gt; <br /><br />昄���username的��|��默认是从request(page)中取�Q�如果request中没有名为username的对象则从session中取�Q�session中没有则从application(servletContext)中取�Q�如果没有取��C�Q何值则不显�C��?br /><br />&lt;c:set&gt;<br />&lt;c:set&gt;标签用于保存数据�Q�它有如下属性 属 性 描 �q�W�是否必�� 缺省值�?br />value 要保存的信息�Q�可以是EL表达式或帔R�� 否 �?br />target 需要修改属性的变量名，一般�ؓjavabean的实例 否 无�?br />property 需要修改的javabean属性 否 无�?br />var 需要保存信息的变量 否 无 <br />scope 保存信息的变量的范围 否 page <br /><br />如果指定了target属�? 那么property属性也必须指定�?br />例子�Q��?lt;c:set value="${test.testinfo}" var="test2" scope=”session”�?&gt; <br /><br />���test.testinfo的��g��存到session的test2中，其中test是一个javabean的实例，testinfo是test对象的属性�?br />&lt;c:set target="${cust.address}" property="city" value="${city}"/&gt; <br /><br />���对象cust.address的city属性��g��存到变量city�?br /><br />&lt;c:remove&gt;<br />&lt;c:remove&gt;标签用于删除数据�Q�它有如下属性 属 性 描 �q�W�是否必�� 缺省值�?br />var 要删除的变量 是 无 <br />scope 被删除变量的范围 否 所有范��_��包括page、request、session、application�{��?br /><br />例子: &lt;c:remove var="test2" scope="session"/&gt; <br /><br />从session中删除test2变量�?br /><br />2、 流控制标签<br /><br />&lt;c:if&gt;<br /><br />&lt;c:if&gt;标签有如下属性 属 性 描 �q�W�是否必�� 缺省值�?br />test 需要评��L��条�g�Q�相当于if (...){}语句中的条�g 是 无 <br />var 要求保存条�g�l�果的变量名 否 无 <br />scope 保存条�g�l�果的变量范图b�否 page <br /><br /><br />&lt;c:choose&gt;<br />�q�个标签不接受�Q何属�?br /><br />&lt;c:when&gt;<br />&lt;c:when&gt;标签有以下属性 属 性 描 �q�W�是否必�� 缺省值�?br />test 需要评��L��条�g 是 无 <br /><br /><br />&lt;c:otherwise&gt;<br />�q�个标签同样不接受�Q何属�?br /><br />例子�Q��?lt;c:if test="${user.wealthy}"&gt;<br />user.wealthy is true.<br />&lt;/c:if&gt; <br /><br />如果user.wealthy值true�Q�则昄���user.wealthy is true.<br /><br />&lt;c:choose&gt;<br />&lt;c:when test="${user.generous}"&gt;<br />user.generous　is true.<br />&lt;/c:when&gt; <br />&lt;c:when test="${user.stingy}"&gt;<br />user.stingy is true.<br />&lt;/c:when&gt;<br />&lt;c:otherwise&gt;<br />user.generous and user.stingy are false.<br />&lt;/c:otherwise&gt;<br />&lt;/c:choose&gt; <br /><br />只有当条件user.generous�q�回值是true�Ӟ��才显�C�user.generous　is true.<br />只有当条件user.stingy�q�回值是true�Ӟ��才显�C�user.stingy　is true.<br />其它所有的情况�Q�即user.generous和user.stingy的值都不�ؓtrue�Q�全部显�C�user.generous and user.stingy are false.<br /><br />�׃��JSTL没有形如if (){…} else {…}的条件语句，所以这�U��Ş式的语句只能�?lt;c:choose&gt;�?lt;c:when&gt;�?lt;c:otherwise&gt;标签共同来完成了�?br /><br />3、 ��@环控制标�{?br /><br />&lt;c:forEach&gt;<br />&lt;c:forEach&gt;标签用于通用数据�Q�它有以下属性 属 性 描 �q�W�是否必�� 缺省值�?br />items �q�行循环的项目 否 无�?br />begin 开始条件 否 0 <br />end �l�束条�g 否 集合中的最后一个项目�?br />step 步长 否�? <br />var 代表当前��目的变量名 否 无 <br />varStatus 昄���循环状态的变量 否 无 <br /><br /><br />例子�Q��?lt;c:forEach items="${vectors}" var="vector"&gt;<br />&lt;c:out value="${vector}"/&gt;<br />&lt;/c:forEach&gt; <br /><br />相当于java语句 for (int i=0;i&lt;vectors.size();i++) {<br />out.println(vectors.get(i));<br />} <br /><br />在这里vectors是一个java.util.Vector对象�Q�里面存攄���是String数据�Q�vector是当前��@环条件下String对象。实际上�q�里的vectors可以是�Q何实��C��java.util. Collection接口的对象。�?br />&lt;c:forEach begin="0" end="100" var="i" step="1"&gt;<br />count=&lt;c:out value="${i}"/&gt;&lt;br&gt;<br />&lt;/c:forEach&gt;<br /> <br /><br />输出:<br />count=0<br />...<br />count=100<br /><br />&lt;c:forTokens&gt;<br />&lt;c:forTokens&gt;标签有以下属性 属 性 描 �q�W�是否必�� 缺省值�?br />items �q�行循环的项目 是 无�?br />delims 分割�W� 是 无�?br />begin 开始条件 否 0 <br />end �l�束条�g 否 集合中的最后一个项目�?br />step 步长 否�? <br />var 代表当前��目的变量名 否 无 <br />varStatus 昄���循环状态的变量 否 无 <br /><br /><br />例子 <br />&lt;c:forTokens items="a:b:c:d" delims=":" var="token"&gt;<br />&lt;c:out value="${token}"/&gt;<br />&lt;/c:forTokens&gt;<br /> <br /><br />�q�个标签的��用相当于java.util.StringTokenizer�c�R��在�q�里���字�W�串a:b:c:d以：分开循环四次�Q�token是��@环到当前分割到的字符丌Ӏ?br /><br />4.导入文�g和URL<br /><br />JSTL核心标签库支持���?lt;c:import&gt;来包含文�Ӟ��使用&lt;c:url&gt;来打印和格式化URL,使用&lt;c:redirect&gt;来重定向URL�?br /><br />&lt;c:import&gt;<br />&lt;c:import&gt;标签包含另外一个页面代码到当前��，它有以下属性 属 性 描 �q�W�是否必�� 缺省值�?br />url 需要导入页面的url 是 无 <br />context /后跟本地web应用�E�序的名字 否 当前应用�E�序 <br />charEncoding 用于导入数据的字�W�集 否 ISO-8859-1 <br />var 接受导入文本的变量名 否 page <br />scope 接受导入文本的变量的变量范围 否�? <br />varReader 用于接受导入文本的java.io.Reader变量名 否 无�?br />varStatus 昄���循环状态的变量 否 无 <br /><br /><br />&lt;c:url&gt;<br />&lt;c:url&gt;标签输出一个url地址�Q�它有以下属性 属 性 描 �q�W�是否必�� 缺省值�?br />url url地址 是 无 <br />context /后跟本地web应用�E�序的名字 否 当前应用�E�序 <br />charEncoding 用于导入数据的字�W�集 否 ISO-8859-1 <br />var 接受处理�q�的url变量名，该变量存储url 否 输出到���?br />scope 存储url的变量名的变量范图b�否 page <br /><br /><br />例子�Q��?br />&lt;c:import url="http://www.url.com/edit.js" var="newsfeed"/&gt;<br /> <br /><br />���url http://www.url.com/edit.js包含到当前页的当前位�|�，�q�将url保存到newsfeed变量中�?br />&lt;a href="&lt;c:url url="/index.jsp"/&gt;"/&gt;<br /> <br /><br />在当前页的当前位�|�输�?lt;a /&gt;�Q�http://www.yourname.com是当前页的所在的位置�?br /><br /><br />&lt;c:redirect&gt;<br />&lt;c:redirect&gt;标签���请求重新定向到另外一个页面，它有以下属性 属 性 描 �q�W�是否必�� 缺省值�?br />url url地址 是 无 <br />context /后跟本地web应用�E�序的名字 否 当前应用�E�序 <br /><br />例子�Q��?br />&lt;c:redirect url="http://www.yourname.com/login.jsp"/&gt;<br /> <br /><br />���请求重新定向到http://www.yourname.com/login.jsp��，相当于response.setRedirect("http://www.yourname.com/login.jsp");<br /><br />&lt;c:param&gt;<br />&lt;c:param&gt;标签用来传递参数给一个重定向或包含页面，它有以下属性 属 性 描 �q�W�是否必�� 缺省值�?br />name 在request参数中设�|�的变量名 是 无�?br />value 在request参数中设�|�的变量值 否 无�?br /><br />例子�Q��?br />&lt;c:redirect url="login.jsp"&gt;<br />&lt;c:param name="id" value="888"/&gt;<br />&lt;/c:redirect&gt;<br /> <br /><br />���参�?88以id为名字传递到login.jsp��面�Q�相当于login.jsp?id=888<br /><br /><br />JSTL的优�?br />1、 在应用�E�序服务器之间提供了一致的接口�Q�最大程序地提高了WEB应用在各应用服务器之间的�U�L���?br />2、 简化了JSP和WEB应用�E�序的开发�?br />3、 以一�U�统一的方式减���了JSP中的scriptlet代码数量�Q�可以达到没有�Q何scriptlet代码的程序。在我们公司的项目中是不允许有�Q何的scriptlet代码出现在JSP中�?br />4、 允许JSP设计工具与WEB应用�E�序开发的�q�一步集成。相信不久就会有支持JSTL的IDE开发工具出现�?br /><br />�ȝ��<br />上面介绍的仅仅是JSTL的一部分�Q�如果有旉���我会�l�箋把其它部分写出来分��n�l�大家。如果要使用JSTL�Q�则必须���jstl.jar和standard.jar文�g攑ֈ�classpath中，如果你还需要��用XML processing及Database access (SQL)标签�Q�还要将相关JAR文�g攑ֈ�classpath中，�q�些JAR文�g全部存在于下载回来的zip文�g中。这个zip文�g可以从http://jakarta.apache.org/builds/jakarta-taglibs/releases/standard/jakarta-taglibs-standard-1.0.zip下蝲�?br /><br />参考资�?br />1、 http://java.sun.com/products/jsp/jstl/<br />sun公司的JSTL站点<br />2、 http://jakarta.apache.org/taglibs/doc/standard-doc/intro.html<br />jakarta���组的JSTL站点<br />3、 http://www.manning.com/bayern/appendixA.pdf<br />JSTL的参考文档，本文很多内容都是从这个PDF文�g里翻译的�?br />4、 ＜�Q�J2EE�~�程指南�Q?.3版）�Q�＞<br />介绍了JSTL的雏形，wrox的书都是�_�֓��?br /><img src ="http://www.tkk7.com/fine/aggbug/67504.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/fine/" target="_blank">Peter Pan</a> 2006-09-04 09:14 <a href="http://www.tkk7.com/fine/archive/2006/09/04/67504.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item><item><title>Java的�?�?常�?/title><link>http://www.tkk7.com/fine/archive/2006/08/31/66823.html</link><dc:creator>Peter Pan</dc:creator><author>Peter Pan</author><pubDate>Thu, 31 Aug 2006 03:42:00 GMT</pubDate><guid>http://www.tkk7.com/fine/archive/2006/08/31/66823.html</guid><wfw:comment>http://www.tkk7.com/fine/comments/66823.html</wfw:comment><comments>http://www.tkk7.com/fine/archive/2006/08/31/66823.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.tkk7.com/fine/comments/commentRss/66823.html</wfw:commentRss><trackback:ping>http://www.tkk7.com/fine/services/trackbacks/66823.html</trackback:ping><description><![CDATA[
		<h1 align="left">
				<font size="3">
						<em>�?/em>
						<font color="#000000">
								<em>常的温习�Q?/em>
						</font>
				</font>
		</h1>
		<h1 align="left">
				<font size="3">
						<font color="#000000">class ThrowsDemo1 {<br /> static void procedure( ) {<br />  System.out.println("inside procedure");<br />  //throw new IllegalAccessException("demo");<br />  throw new RuntimeException("Demo");    //�q�行时异�?<br />  }<br /> public static void main(String args[]) {<br />  procedure( );<br />  }<br /> } </font>
				</font>
		</h1>
		<h1 align="left">
				<font size="3">
						<font color="#000000">
						</font>
				</font> </h1>
		<h1 align="left">
				<font size="3">
						<font color="#000000">  来自�Q?a >http://www.shu.edu.cn/campus/java/chp8.html</a></font>
				</font>
		</h1>
		<h1 align="center">�W?�?�?Java的�?�?常�?</h1>
		<p>�?�?常�?�?�?�?�E?�?�q?�?�?�?�?�?�?�?�?�?��c�?�?�?传统 �?�?�a� �~?�E?�Ӟ�� �E?�?�?�?�?�?�q?�?�?�?�q?�?�?�?�?出错 �?�?息�?�q?�?�?�?�?�?�?�?误， �?�?�?�?�?�?�?�?需 要知 �?�?�?�?�?�?�?�?�l?节�?�?常， �?�?局 �?量errno�?�?储�?�?常�?�?�c?型�?�q?�?�?�?�?�?用， �?�?一 个errno�?�?�?�?能在 �?�?�??reg; �?�?�?�?�?�?�?�?�?掉�?�?�?最 �?��?的C语言 �E?序， �?�?�?理�?�?常�?�?况， �?�?�?�?于goto�?句�?Java对�?�?常�?�?�?�?�?�?�?�?�?的�?一 个Java的Exception�?一 �?�?�q��?�?常�?�?�?�?�?象�?�?�?现�?�?常�?�?�?�Ӟ�� 一 个Exception对象 ��?�?�?了， �q?�?�?�?�?�q?个�?�?常�?�?�?�?�?�?里�?</p>
		<h2 align="center">8.1 基础 </h2>
		<p>Java的�?�?常�?�?�?�?�?�q?�?�?�?�?�?�?�?的：try, catch, throw, throws和finally�?用try �?�?�?一 �D?�E?序， �?�?�?现�?异常”， �p?�l?�?出（throws?copy; 一 个�?�?常”， �?�?�?�?�q?�?的类 �?�?�?捉（catch?copy; 它， �?最 后（finally?copy; �?�~?�?处理 �?�?�?理�?�?�?是�?�?常�?�?�?�E?�?�?�?�?�?式： </p>
		<p>try { //�E?�?�?} catch (ExceptionType1 e) { // 对ExceptionType1的处 �?} catch (ExceptionType2 e) { // 对ExceptionType2�?�?�?throw(e); //�?�?�?�q?个�?�?常�?} finally { } </p>
		<h2 align="center">8.2 "�?常�?�?�c?�?/h2>
		<p>在�?�?常�?�c?�?��?�?最 �?�?�?一 �?�?�?�?�c?�?做Throwable。这 �?�c?�?�?�?�C?所 �?的�?�?常�?�?��c�?�?个�?�?常�?�c?�?都是Throwable�?�?�c�R��Throwable�?�?�?�?�?�?�?�c�R�?一 �c?是Exception�Q�是 �?�?�E?�?�?�?�?�?�?的�?�?常�?�?��c�?�?�?��?�?�q?�?生它 �?�?�c?�?�?�?�?�?的�?�?常”�?�?一 �c?是Error�Q?�?�?�?了那 ?copy; �?�?�?�?�?�?�?的�?�?常”�?�?�?�?�?用Error�?�c�，�?�?�?�?�?�?�?�?�?�?�?�?�?�?败�?在Exception�?�?一 �?子类RuntimeException�Q?�?�?�E?�?�q?�?�?�?�?�?�?�??copy; �?误作 �?�?�?�?�?�?的�?</p>
		<h2 align="center">8.3 �?�?捉�?�?常�?</h2>
		<p>�?�?常�?�?�?是Java�?�q?�?�?�?�??copy;�?�?常�?�?�?作出 �?�?�?�?�?的�?�?如， �?�?�q?�?��?�E?�?�?�?一 �?�?�?�?除的�?�?常”�?</p>
		<p>class Exc0 { public static void main(String args[]) { int d = 0; int a = 42/d; } } </p>
		<p>当Java�?�?�q?�?�?�?�Ӟ�� �?�?�?�?�?�Q?��?�?�?�?一 个�?异常�?�?�?�?�?�E?�?�?�?�?�q?�?�?�q?�?�?�?�?况， �?�q?�?时�?�?出”（throw?copy; �q?个�?�?常”�?说�?�?出�?�?�?�?�?�?一�?�?�?�?�?�?薯， �?�?��?�?�?�?�?�q?�?�?�?理�?�E?�?��?���会 �?�?�?�?�?�W?�?�?�?断， �?�?��� �?�?�?�?�?�?�?�?来查 �䏀?�?常”�?一 个�?�?常�?�?�?�?�?�?�?�?�?�?理�?�?常�?�?�?的�?�?�q?�?�?�?里， �?�?�?�?�~?一 个�?�?常�?�?�?器，所 �?�~?�?�?�?�?�?��?�?�?�?�?了�?�~?�?�?�?�?�?�?印Exception的字 �W??reg; �?�?�?�?�?�?常�?�?�?炏V�?�?�?�?�?�?�?��?例子 �?�?出�?</p>
		<p>C:\&gt;java Exc0 java.lang.arithmeticException: / by zero at Exc0.main(Exc0.java:4) </p>
		<h2 align="center">8.4 try与catch </h2>
		<p>�?�?�?�?�?�?�?�?�?�?理�?�?常�?�q?�l?�l?�q?行�?�?�?用try来指 �?一 �?�?�?所 有�?�?常�?�?�?�E?序�?�?�?在try�E?�?�?面，�?�?�?一 个catch�?�?�?�?�?�?�?�?�?�?的�?�?常�?�?�c?型。例 如， �?�?�?�?�?�?�?�?�?�?�?�?�?基础�?�?�?的， �?它包 �?一 个try�E?�?�?�?一 个catch�?句�?</p>
		<p>class exc1 { public static void main(string args[]) { try { int d = 0; int a = 42 / d; } catch (arithmeticexception e) { system.out.println("division by zero"); } } } </p>
		<p>catch�?�?�?�?�?�?�?决�?�?常�?�?况， �?一 ?copy; �?�?讑ֈ� �?�?�?�?态， �q?�?�?�?�?�?一 �?�l?�l?�q?行�?�?�?一 �?子程 �?�?�?�?�?个�?�?常”， �?�q?�?�?一 �U?�?理， �?�?最 外一 �U��?</p>
		<h2 align="center">8.5 �?个catch�?�?/h2>
		<p>�?�??copy; �?�?下， �?一 �D?�E?�?�?�?�?�?�?�?一 �U��?异常�?�?��c�?�?�?�?�?�|?�?个catch�?句， �?�?�?一 �U��?�?常�?�c?�?�?��?�?��� 查， �W?一 �?�??reg; �?�?�?��?�?�?�?行�?如果 一 �?�c?�?�?�?�c?�?�?�?话， �?�?�?�c?�?�?�?面， �?�?���永 �q?�?�?�?�?�?�c�R�?�?�?�?一 �?�?�?个catch�?�?�?�E?�?的例 子�?</p>
		<p>class MultiCatch { public static void main(String args[]) { try { int a = args.length; System.out.println("a = " + a); int b = 42/a; int c[] = {1}; c[42] = 99; } catch(ArithmeticException e) { System.out.println("div by 0: " + e); } catch(ArrayIndexOutOfBoundsException e) { system.out.println("array index oob: " + e); } } } </p>
		<p>�?�?�?�E?�?�q?�?�?�?�?�?敎ͼ� ��?�?�?�?一 �?�?�?�?的�?�?常”， �?为a�?�?�?�?�?�?�?�?�??copy; 一 �?�?�?�?�?敎ͼ���?�?�?�?�?�q?个�?�?常”， �?为a�?�?�?�?�?�?�?�?�?一 �?ArrayIndexOutOfBoundexception的�?�?常”， �?�?�?�?�?�l�c�?�?度是1�Q?�?�l�c[42]�?倹{�?�?�?�?�?�?�?�U?�?�?�?�q?�?�l?果�?</p>
		<p>C:\&gt;java MultiCatch a = 0 div by 0: java.lang.arithmeticexception: / by zero C:\&gt;java MutiCatch 1 a = 1 array index oob: java.lang.ArrayIndexOutOfBoundsException:42 </p>
		<h2 align="center">8.6 try�?�?�?�?�?</h2>
		<p>�?�?�?�?一 �?�?�?�?�?�?�?�?�?�?�?一 个try�?句， �?�q�个 �?�?�?�?�?部， �?�?一 个try�?�?�?�?�?�?�?码�?�?�?遇到 一 个try�?句，�?�?常�?�?�?�?��?�?�?�?�?�?面， �?�?所 有的try�?�?�?�?成�?�?�?�?一 �U?的try�?�?�?�?�?�?�U��?�?常�?�q?�?�?理， �?�?��?�?�?开�Q?�?�?�?�?�?�?�?�q?�U��?�?常�?的try�?句�?�?�?�?一 个try�?�?�?�?�?�?子�?</p>
		<p>class MultiNest { static void procedure() { try { int c[] = { 1 }: c[42] = 99; } catch(ArrayIndexOutOfBoundsexception e) { System.out.println("array index oob: " + e); } } public static void main(String args[]) { try { int a = args.length; system.out.println("a = " + a); int b = 42/a; procedure(); } catch(arithmeticException e) { System.out.println("div by 0: " + e); } } } </p>
		<p>�?�?�?数procedure�?�?�?�?的try/catch�?�Ӟ�� 所 以main�?�?��d�� �?ArrayIndexOutOfBoundsException�?</p>
		<h2 align="center">8.7 throw�?�?/h2>
		<p>throw�?�?�?�?�?��?�?�?�?一 个�?�?常”�?�?先， �?�?��?得到 一 个Throwable�?�?�?�?�?�?柄， �?�q?�?�?�?到catch�?句， 或�?用new�?�?�W?�?�?�?一 个�?�?�?是throw�?�?�?�?�?�?式�?</p>
		<p>throw ThrowableInstance; </p>
		<p>�E?�?�?在throw�?�?�?�?�?�l?止， �?�?�?�?�?�?�?�?�?刎ͼ��?�?�?�?�?�?�?所 有try�?�?�?�?�?�?�?�?�?�?�?�?�?配的catch�?�?的try块�?�?�?�?一 �?�?有throw�?�?�?�?子�?</p>
		<p>class ThrowDemo { static void demoproc() { try { throw new NullPointerException("de3mo"); } catch(NullPointerException e) { System.out.println("caught inside demoproc"); throw e; } } public static void main(String args[]) { try { demoproc(); } catch(NullPointerException e) { system.out.println("recaught: " + e); } } } </p>
		<h2 align="center">8.8 throws�?�?</h2>
		<p>throws�?�?�?�?一 �?�?�?�?�?�?�?�?�?�?�?�U��?�?常”。对 �?�?数Exception�?�c?�?��_��Java �~?�?�?�?�?�q?�?�?�?�?一�?�?�?�?�?�?�?�?的�?�?常�?�?�c?型�?�?果�?�?常�?�?�c?型是Error�?RuntimeException�Q?�?�?�?�?�?�c�， �q?�?�?�?�?�?�?用，�?�?�q??copy; �?�E?�?�?�?�?�?�?�?�?�?�?�?�?�?的�?�?果你 �?�?��?�?�?�?一 个RuntimeException�Q?�?�?��?用throws�?�?来声 �?�?�?�c?型�?�q?��?�?�?�?�?�?�?�?�?�?�?�?�?�?法： </p>
		<p>type method-name(arg-list) throws exception-list { } </p>
		<p>�?�?�?一 �D?�E?序， �?�?�?�?一 个�?�?常”， �?�?�?�?捕捉 它， �?�?�?用throws�?�?明�?�q?�?�~?�?�?��?�?�?�?�q��?</p>
		<p>class ThrowsDemo1 { static void procedure( ) [ System.out.println("inside procedure"); throw new IllegalAccessException("demo"); } public static void main(String args[]) { procedure( ); } } </p>
		<p>�?�?�?�q?�?�?�?�~?�?�q?去， �?�?需 �?�?�?�?�?�?数procedure抛出 了IllegalAccessException�Q?�q?�?�?�?�?�?�?�?�?�?数main�?捕捉 它�?�?�?�?�?��?�?�?子： </p>
		<p>class ThrowsDemo { static void procedure( ) throws IllegalAccessException { System.out.println("inside procedure"); throw new IllegalAccessException("demo"); } public static void main(String args[]) { try { procedure( ); } catch (IllegalAccessException e) { System.out.println("caught " + e); } } } </p>
		<p>�?�?�?�?�?�l?果： </p>
		<p>C:\&gt;java ThrowsDemo inside procedure caught java.lang.IllegalAccessException: demo </p>
		<h2 align="center">8.9 finally </h2>
		<p>�?一 个�?�?常�?�?�?�?�Ӟ�� �E?�?�?�?�?��?�?�?�?�U?�?的，�?�q?�??copy; 行， �?�?�?�?�?�?�?�??reg; �?�?的catch�?句�?�q?�?�?�q?回�?�?�?��?�?一 �D?�?�?�?��?�?�?什 么�?�?常�?�?�?�?�?�?�?�?�?的， �?�?词finally��?�?�?�?�?�?�q?�?一�D?�?�?的�?�?�?�?�?有catch�?句，finally�E?�?�?�?�?�?�?�?try�E?�?�?�?�?�E?�??reg; �?�?行�?�?个try�?�?�?需 �?�?���一 �?�??reg; �?�?的catch�?�?或finally�?句�?一 �?�?�?�?�?�q�回 �?�?�?�?�?�?�?�?敎ͼ� �?�?�?�q?一 �?�?�?�?�?的�?�?常”，�?�?�?�q?一 �?�?��?的return�?句，finally�?�?�?�?�?�?�?�?员函 �?�q?�?�?�?行�?�?�?�?一 �?�?子， �?�?�?�?�?�?�?敎ͼ��?�?�?�?�?�?�?�?�?�?�?�?退 出， �?�?�?了finally�?句�?</p>
		<p>class FinallyDemo { static void procA( ) { try { System.out.println("inside procA"); throw new RuntimeException("demo"); } finally { System.out.println("procA's finally"); } } static void procB( ) { try { System.out.println("inside procB"); return; } finally { System.out.println("procB's finally"); } } public static void main(String args[]) { try { procA( ); } catch (Exception e); procB( ); } } </p>
		<p>�?�?�?�q?�?�?�?�?�q?�?�l?果： </p>
		<p>C:\&gt;java FinallyDemo inside procA procA's finally inside procB procB's finally </p>
		<h2 align="center">�?�?��?�l?</h2>
		<p>1. �?�?常�?�?�?�?�E?�?�q?�?�?�?�?�?�?�?�?�?��c�?2. 在�?�?常�?�c?�?��?�?最 �?�?�?�c?叫Throwable�Q?�?�?�?�?�?�?�?子类�Q�Exception和Error�?3. Java的�?�?常�?�?�?�?�q?�?�?�?�?�?实现�Q�try�Q�catch�Q�throw�Q�throws和finally。�?br /><br />   来自�Q?a >http://www.shu.edu.cn/campus/java/chp8.html</a><br /><br /></p>
<img src ="http://www.tkk7.com/fine/aggbug/66823.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://www.tkk7.com/fine/" target="_blank">Peter Pan</a> 2006-08-31 11:42 <a href="http://www.tkk7.com/fine/archive/2006/08/31/66823.html#Feedback" target="_blank" style="text-decoration:none;">发表评论</a></div>]]></description></item></channel></rss>                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           <footer>
<div class="friendship-link">
<p>��л���������ǵ���վ�������ܻ���������Դ����Ȥ��</p>
<a href="http://www.tkk7.com/" title="&#20122;&#27954;&#97;&#118;&#25104;&#20154;&#29255;&#22312;&#32447;&#35266;&#30475;">&#20122;&#27954;&#97;&#118;&#25104;&#20154;&#29255;&#22312;&#32447;&#35266;&#30475;</a>

<div class="friend-links">


</div>
</div>

</footer>

��վ֩���ģ�壺
<a href="http://avav2021.com" target="_blank">�þþ�Ʒ��Ƶ���</a>|
<a href="http://www-ttyx.com" target="_blank">�þ������պ���Ʒһ����������</a>|
<a href="http://hnshlt.com" target="_blank">99�þ���ѹۿ�</a>|
<a href="http://kan63.com" target="_blank">һ���ػ�aaa��Ƭ��ѿ�</a>|
<a href="http://416164.com" target="_blank">��������Ļ����������</a>|
<a href="http://8b22.com" target="_blank">91�������޾�Ʒר��</a>|
<a href="http://meinvtaotu.com" target="_blank">�������޾���ҹ�þþþþ�</a>|
<a href="http://ziguang1688.com" target="_blank">������������һҹ�ߴ���</a>|
<a href="http://xian66.com" target="_blank">����91ɫ�ۺϾþ����</a>|
<a href="http://sd-ll.com" target="_blank">����j����Ů��j�ڲ������վ</a>|
<a href="http://wwwv27.com" target="_blank">��������av������Ѹ߳�ˮ</a>|
<a href="http://conghui8.com" target="_blank">��Ů����ѹۿ���վ</a>|
<a href="http://www026qqcom.com" target="_blank">���޾�Ʒ��Ů�þ�7777777</a>|
<a href="http://niutextile.com" target="_blank">���޵�һ��Ʒ��Ӱ��</a>|
<a href="http://aicbbs.com" target="_blank">����AV����Ƭɫ���߹ۿ�</a>|
<a href="http://172pk.com" target="_blank">������ҹ������Ʒ����</a>|
<a href="http://928288.com" target="_blank">�����ұ�ͨ��ӰƬ���߲�������</a>|
<a href="http://ss8kk.com" target="_blank">������Ʒjizz���߹ۿ����</a>|
<a href="http://gzjing365.com" target="_blank">��������޶����߹ۿ���վ
</a>|
<a href="http://htsp777.com" target="_blank">������Ʒ��Ů�߳��鴤�����վ</a>|
<a href="http://8mav1000.com" target="_blank">97�����������</a>|
<a href="http://wlamyx.com" target="_blank">�������av���벻�����߹ۿ�</a>|
<a href="http://ac839.com" target="_blank">�ձ��˵�ɫ�������վ</a>|
<a href="http://thegaybdsm.com" target="_blank">�����Ƶ����Ƭ���߹ۿ�</a>|
<a href="http://cc19123.com" target="_blank">�þù��������׾�Ʒ���һ</a>|
<a href="http://microston.com" target="_blank">������Ƶ��ַ��ѹۿ�</a>|
<a href="http://aicbbs.com" target="_blank">�鶹��Ʒ����������ѿ�</a>|
<a href="http://8b22.com" target="_blank">���������Ļ��ȫ��Ѱ�����</a>|
<a href="http://www6yg6yg.com" target="_blank">���������պ�ŷ�����Ƶ</a>|
<a href="http://am33318.com" target="_blank">�����˿�www�����Ƶ</a>|
<a href="http://ittenyear.com" target="_blank">���߿�Ƭ����˳���Ƶ��������</a>|
<a href="http://srvz83.com" target="_blank">�þþþþ�ëƬ��ѿ�</a>|
<a href="http://jpsp8.com" target="_blank">���������ˬ�ִ̼���վ</a>|
<a href="http://91sebo.com" target="_blank">���޹������˾�Ʒ�þþù�������һ������������
</a>|
<a href="http://xingqiu1.com" target="_blank">���޹���ģ�����߲���</a>|
<a href="http://18yinren.com" target="_blank">ww����ww���߹ۿ�����</a>|
<a href="http://339258.com" target="_blank">У԰���޴�ɫ����С˵�ϼ�
</a>|
<a href="http://tianmao920.com" target="_blank">�þþþ����޾�Ʒ���˵�����</a>|
<a href="http://789xxoo.com" target="_blank">����ɫ���þþ��ۺ���������</a>|
<a href="http://www-774220.com" target="_blank">���޹�������Ƭ���߹ۿ�</a>|
<a href="http://lianghao999.com" target="_blank">���޳�������������Ļ</a>|
<script>
(function(){
    var bp = document.createElement('script');
    var curProtocol = window.location.protocol.split(':')[0];
    if (curProtocol === 'https') {
        bp.src = 'https://zz.bdstatic.com/linksubmit/push.js';
    }
    else {
        bp.src = 'http://push.zhanzhang.baidu.com/push.js';
    }
    var s = document.getElementsByTagName("script")[0];
    s.parentNode.insertBefore(bp, s);
})();
</script>
</body>