亚洲91精品麻豆国产系列在线 ,亚洲国产一区二区视频网站,亚洲色大成WWW亚洲女子

JQGrid

思无 — Fri, 06 Apr 2012 04:57:00 GMT

摘要: JQGrid是一个在jquery基础上做的一个表格控�Ӟ��以ajax的方式和服务器端通信。JQGrid Demo 是一个在�U�的演示��目。在�q�里�Q�可以知道jqgrid可以做什么事情。下面是转自其他人blog的一个学习资料，与其说是学习资料�Q�说成查询帮助文档更加合适�? jqGrid学习�?------------- 安装 jqGrid安装很简单，只需把相应的css、js文�g加入到页面中卛_��? 按照... 阅读全文

思无 2012-04-06 12:57 发表评论

IE长时间等待服务器响应�Q�显�C�页面无法显�C�的问题

思无 — Sun, 07 Aug 2011 14:12:00 GMT

��目通过JASPER跑报表，有几个报表牵涉的数据量比较大�Q�导致响应时间超�q?个小�Ӟ��此时��面会提�C?#8220;��面无法昄��”�?br />开始以为是session的超�Ӟ��于是在页面中��d��了ajax��d��期发送请求给服务器的代码来维持session�Q?问题无法解决�?br />然后以�ؓ是页面缓存的问题�Q�在��h��中加了随机的数字�Q�查看每�ơ请求回来的响应头状态都�?00的，问题仍旧无法解决�?br />�l�箋癑ֺ��Q��l�谷歌�?br />搜烦到microsoft的一��文章，如下

http://support.microsoft.com/kb/181050

Internet Explorer error "connection timed out" when server does not respond
问题得到解决�?br />其实可以说问题无法得到解冟뀂我怎么可能让每个用户去修改他们的注册表么�?br />
看来只能采取异步的请求方式了�?/span>

思无 2011-08-07 22:12 发表评论

Actuate使用�ȝ��

思无 — Wed, 29 Jun 2011 05:28:00 GMT

Actuate ��单报表的建立�q�程

1�Q?1. 打开 e.report 选择new report

2�Q?2.选择�I�白报表

3�Q?3. 建立数据库连接�?/span>Toolsà Database Connection

4�Q?4. 填写参数

5�Q?5. 双击datasource , 填写查询参数

6�Q?6. 选中Content, Tool--�?span style="font-family: Wingdings;"> Grouping, 讄��整个报表�?/span>group�Q?/span>1�?/span>or n层�?/span>

7�Q?7. 单击grouping option,讄��group的显�C�，是否需�?/span>befer,after�{�，每个group需要单独设�|��?/span>

8�Q?nbsp; 8. 讄��各种��面的控�?/span>

9�Q?9. 讄��参数�Q�这些参数可以用在报表控制上或是查询的参�?/span>Tools -- Parameters

修改后的查询字段

select fund_id,fund_name,fund_abbreviation,fund_mode,rule_id from te_fund where fund_mode=:fundmode

参数10. 用来控制��面昄��

�?/span>label��Z��子，重写OnRow�Ҏ��

Sub OnRow( row As AcDataRow )
    Super::OnRow( row )
    if fundmode="M" then
         me.Text = "Manual Fund Name"
    else
         me.Text = "Auto Fund Name"
    end if
End Sub

11. �?/span>datasource中的数据控制��面

Sub OnRow( row As AcDataRow )
Super::OnRow( row )
    If row.GetValue("DR_SHORT_FLAG") =0 Then
     me.Text = "BUY BACK"
    ElseIf row.GetValue("DR_SHORT_FLAG") =1 Then
     me.Text = "Sell to Open"
    End if
End Sub

思无 2011-06-29 13:28 发表评论

思无 — Tue, 28 Jun 2011 14:46:00 GMT

Flex Builder 3 正式版，发布于中国时�?2008 �q?2 �?25 日；

下蝲地址一�Q?br style="margin: 0px; padding: 0px;" />http://download.macromedia.com/pub/flex/flex_builder/FB3_win.exe
大小�Q?424 MB �Q�未�q�行压羃�?nbsp;Flex Builder 3 安装文�g
不用注册��d��Q�可以直接下载�?br style="margin: 0px; padding: 0px;" />
下蝲地址二：

http://trials.adobe.com/Applications/.../FB3_WWEJ.exe
大小�Q�　385.84 MB　�Q�　已经压羃�?nbsp;Flex Builder 3 安装文�g
需要注册登录，才可下蝲�?/font>

Flex builder 3.0注册码（已经试过的，可用的）�Q?/font>

1377-4168-2018-0771-2432-1495

1377-4760-3354-0772-2773-8996

1377-4165-2080-7265-7813-8901

1377-4964-5021-8182-2399-8235

Flex builder 中要�q�行调试�Q�就必须安装含debug的flash player版本。下载链接地址�Q?/font>

Adobe Flash Player 9 — Debugger Versions (aka debug players or content debuggers) for Flex and Flash Developers

12/3/2007 Updated debugger versions of Flash Player 9 (aka debug players or content debuggers) are available for Flex Builder 2 users and Flash CS3 Professional users. These new players are version 9.0.r115.

Download the Windows Flash Player 9 ActiveX control content debugger (for IE) (EXE, 1.59 MB)

Download the Windows Flash Player 9 Plugin content debugger (for Netscape-compatible browsers) (EXE, 1.56 MB)

Download the Windows Flash Player 9 Projector content debugger (EXE, 3.69 MB)

Download the Macintosh Flash Player 9 Plugin content debugger (Intel-based Macs) (DMG, 5.35 MB)

Download the Macintosh Flash Player 9 Plugin content debugger (PowerPC-based Macs) (DMG, 2.41 MB)

Download the Macintosh Flash Player 9 Projector content debugger (ZIP, 4.81 MB)

12/3/2007 Updated Linux debugger versions (aka debug players or content debuggers) of Flash Player 9 are now available. Additionally, the Linux standalone player (projector) is available for developers who wish to publish projectors on Linux operating systems.

Download the Linux debugger and standalone players (TAR.GZ, 9.29 MB)

思无 2011-06-28 22:46 发表评论

��单的session ��时提新

思无 — Tue, 28 Jun 2011 08:22:00 GMT

��目中，��览器和服务器之间长旉��没有交互�Q�会被超�Ӟ��但是用户只有在下�ơ尝试连接的时候才会知道已�l�超时了。�ȝ��了一下当前这个项目针对这个问题是怎么做的�?
在即��超时的时候，提醒用户�Q�之后通过ajax 发送空消息�l�服务器以防止服务器��session无效�?br />下面是核心的代码�Q?br />

思无 2011-06-28 16:22 发表评论

(�?J2EE��目异常处理

思无 — Mon, 27 Jun 2011 08:02:00 GMT

http://www.iteye.com/topic/72170

关于j2ee��目中异常的��理和设计。之前一直困惑于异常的处理，��Z��么异常分为checked和uncheck�Q�应该遵循怎样的规则自定义异常。在j2ee��目中，处理异常需要注意什么地斏V�?br />[原文]

��Z��么要在J2EE��目中谈异常处理呢？可能许多java初学者都惌��Q?#8220;异常处理不就是try….catch…finally吗？�q�谁都会啊！”。笔者在初学java时也是这栯��为的。如何在一个多层的j2ee��目中定义相应的异常�c�？在项目中的每一层如何进行异常处理？异常何时被抛出？�?�怽�时被记录�Q�异常该怎么记录�Q�何旉��要把checked Exception转化成unchecked Exception �Q�何旉��要把unChecked Exception转化成checked Exception?异常是否应该呈现到前端页面？如何设计一个异常框�Ӟ��本文��就�q�些问题�q�行探讨�?

1�Q?nbsp;JAVA异常处理

在面向过�E�式的编�E�语�a�中，我们可以通过�q�回值来��定�Ҏ��是否正常执行。比如在一个c语言�~�写的程序中�Q�如果方法正��的执行则返�?.错误则返�?。在vb或delphi开发的应用�E�序中，出现错误�Ӟ��我们��弹��Z��个消息框�l�用戗��?/div>

通过�Ҏ��的返回值我们�ƈ不能获得错误的详�l�信息。可能因为方法由不同的程序员�~�写�Q�当同一�c�错误在不同的方法出现时�Q�返回的�l�果和错误信息�ƈ不一致�?/div>

所以java语言采取了一个统一的异常处理机制�?/div>

什么是异常�Q�运行时发生的可被捕获和处理的错误�?/div>

在java语言中，Exception是所有异常的父类。�Q何异帔R��?展于Exception�c�R��Exception��q��当于一个错误类型。如果要定义一个新的错误类型就扩展一个新的Exception子类。采用异常的好处 �q�在于可以精��的定位到导致程序出错的源代码位�|?�q�获得详�l�的错误信息�?/div>

Java异常处理通过五个关键字来�?玎ͼ�try,catch,throw ,throws, finally。具体的异常处理�l�构由try….catch….finally块来实现。try块存攑֏�能出现异常的java语句�Q�catch用来捕获�?生的异常�Q��ƈ对异常进行处理。Finally块用来清除程序中未释攄��资源。不��理try块的代码如何�q�回�Q�finally块都��L��被执行�?/div>

一个典型的异常处理代码

java 代码

public String getPassword(String userId)throws DataAccessException{
String sql = “select password from userinfo where userid=’”+userId +”’”;
String password = null;
Connection con = null;
Statement s = null;
ResultSet rs = null;
try{
con = getConnection();//获得数据�q�接
s = con.createStatement();
rs = s.executeQuery(sql);
while(rs.next()){
password = rs.getString(1);
}
rs.close();
s.close();
}
Catch(SqlException ex){
throw new DataAccessException(ex);
}
finally{
try{
if(con != null){
con.close();
}
}
Catch(SQLException sqlEx){
throw new DataAccessException(“关闭�q�接��p�|!”,sqlEx);
}
}
return password;
}

可以看出Java的异常处理机制具有的优势�Q?/div>

�l�错误进行了�l�一的分�c�，通过扩展Exception�c�L��其子�c�L��实现。从而避免了相同的错误可能在不同的方法中��h��不同的错误信息。在不同的方法中出现相同的错误时�Q�只需要throw 相同的异常对象即可�?/div>

获得更�ؓ详细的错误信息。通过异常�c�，可以�l�异常更��l�，对用��h��为有用的错误信息。以便于用户�q�行跟踪和调试程序�?/div>

把正��的�q�回�l�果与错误信息分��R��降低了�E�序的复杂度。调用者无需要对�q�回�l�果�q�行更多的了解�?/div>

强制调用者进行异常处理，提高�E�序的质量。当一个方法声明需要抛��Z��个异常时�Q�那么调用者必��M��用try….catch块对异常�q�行处理。当然调用者也可以让异常��l�往上一层抛出�?/div>

2�Q?nbsp;Checked 异常 �q�是 unChecked 异常�Q?/div>

Java异常分�ؓ两大�c?checked 异常和unChecked 异常。所有��承java.lang.Exception 的异帔R��属于checked异常。所有��承java.lang.RuntimeException的异帔R��属于unChecked异常�?/strong>

当一个方法去调用一个可能抛出checked异常的方法，必须通过try…catch块对异常�q�行捕获�q�行处理或者重新抛出�?/div>
我们看看Connection接口的createStatement()�Ҏ��的声明�?/div>
public Statement createStatement() throws SQLException;



   SQLException是checked异常。当调用createStatement�Ҏ��Ӟ��java强制调用者必��d��SQLException�q�行捕获处理�?/div>

java 代码

       public String getPassword(String userId){
       try{
       ……
              Statement s = con.createStatement();
              ……
       Catch(SQLException sqlEx){
              ……
   }
……
}
或�?/div>

java 代码

public String getPassword(String userId)throws SQLException{
   Statement s = con.createStatement();
}

(当然�Q�像Connection,Satement�q�些资源是需要及时关闭的�Q�这里仅是�ؓ了说明checked 异常必须强制调用者进行捕��h��l�箋抛出)

unChecked异常也称��行时异常�Q�通常 RuntimeException都表�C�用��h��法恢复的异常�Q�如无法获得数据库连接，不能打开文�g�{�。虽然用户也可以像处理checked异常一��h��?unChecked异常。但是如果调用者�ƈ没有��L��获unChecked异常�Ӟ��~�译器�ƈ不会强制你那么做�?/strong>

比如一个把字符转换为整型数值的代码如下�Q?/div>

java 代码

String str = “123”;
int value = Integer.parseInt(str);

parseInt的方法签名�ؓ�Q?/div>

java 代码

public static int parseInt(String s) throws NumberFormatException

当传入的参数不能转换成相应的整数�Ӟ��会抛出NumberFormatException。因为NumberFormatException扩展于RuntimeException�Q�是unChecked异常。所以调用parseInt�Ҏ��时无需要try…catch

因�ؓjava不强制调用者对unChecked异常�q�行捕获或往上抛出。所以程序员��L��喜欢抛出unChecked异常。或者当需要一个新的异常类�Ӟ��L��习惯的从RuntimeException扩展。当你去调用它些�?法时�Q�如果没有相应的catch块，�~�译器也��L��让你通过,同时你也�Ҏ��无需要去了解�q�个�Ҏ��倒底会抛��Z��么异常。看��h��q�似乎倒是一个很好的办法�Q�但�?�q�样做却是远��M��java异常处理的真实意图。�ƈ且对调用你这个类的程序员带来误导�Q�因��用者根本不知道需要在什么情况下处理异常。而checked�?常可以明��的告诉调用者，调用�q�个�c�需要处理什么异常。如果调用者不��d��理，�~�译器都会提�C��ƈ且是无法�~�译通过的。当然怎么处理是由调用者自己去军_��的�?/div>

       所以Java推荐��Z��在应用代码中应该使用checked异常。就像我们在上节提到�q�用异常的好外在于可以强制调用者必��d��会产生的异常进行处理。包括在《java Tutorial》等java官方文档中都把checked异常作�ؓ标准用法�?/div>
       使用checked异常�Q�应意味着有许多的try…catch在你的代码中。当在编写和处理��来��多的try…catch块之后，许多人终于开始怀疑checked异常倒底是否应该作�ؓ标准用法了�?/div>
甚至�q�大名鼎鼎的《thinking in java》的作者Bruce Eckel也改变了他曾�l�的��x��。Bruce Eckel甚至��d��把unChecked异常作�ؓ标准用法。�ƈ发表文章�Q�以试验checked异常是否应该从java中去掉。Bruce Eckel语：“当少量代码时�Q�checked异常无疑是十分优雅的构思，�q�有助于避免了许多潜在的错误。但是经验表明，对大量代码来说结果正好相�?#8221;

关于checked异常和unChecked异常的详�l�讨论可以参�?/div>
Alan Griffiths http://www.octopull.demon.co.uk/java/ExceptionalJava.html

   Bruce Eckel http://www.mindView.net/Etc/Disscussions/CheckedExceptions

   《java Tutorial�?http://java.sun.com/docs/books/tutorial/essential/exceptions/runtime.html

使用checked异常会带来许多的问题�?/div>
       checked异常��D��了太多的try…catch 代码

              可能有很多checked异常对开发�h员来说是无法合理地进行处理的�Q�比�?SQLException。而开发�h员却不得不去�q�行try…catch。当开发�h员对一个checked异常无法正确的处理时�Q�通常是简单的把异常打�?出来或者是�q�脆什么也不干。特别是对于新手来说�Q�过多的checked异常让他感到无所适从�?/div>

java 代码

       try{
       ……
              Statement s = con.createStatement();
              ……
       Catch(SQLException sqlEx){
              sqlEx.PrintStackTrace();
   }
   或�?
       try{
       ……
              Statement s = con.createStatement();
              ……
       Catch(SQLException sqlEx){
          //什么也不干
}

checked异常��D��了许多难以理解的代码产生

        当开发�h员必��d��捕获一个自己无法正��处理的checked异常�Q�通常的是重新��装成一个新的异常后再抛出。这样做�q�没有�ؓ�E�序带来��M��好处。反而��代码晚难以理解�?/div>
��像我们使用JDBC代码那样�Q�需要处理非常多的try…catch.�Q�真正有用的代码被包含在try…catch之内。��得理解这个方法变理困难�v�?/div>
checked异常��D��异常被不断的��装成另一个类异常后再抛出

java 代码

        public void methodA()throws ExceptionA{
         …..
          throw new ExceptionA();
}

public void methodB()throws ExceptionB{
   try{
      methodA();
      ……
   }catch(ExceptionA ex){
   throw new ExceptionB(ex);
   }
}

        Public void methodC()throws ExceptinC{
       try{
         methodB();
         …
       }
       catch(ExceptionB ex){
          throw new ExceptionC(ex);
        }
    }
我们看到异常��p��样一层层无休止的被封装和重新抛出�?/div>

checked异常��D��破坏接口�Ҏ��

   一个接口上的一个方法已被多个类使用�Q�当��个方法额外添加一个checked异常�Ӟ��那么所有调用此�Ҏ��的代码都需要修攏V�?/div>

可见上面�q�些问题都是因�ؓ调用者无法正��的处理checked异常时而被�q�去捕获和处理，被迫��装后再重新抛出。这样十分不方便�Q��ƈ不能带来��M��好处。在�q�种情况下通常使用unChecked异常�?/div>
chekced异常�q�不是无一是处�Q�checked异常比传�l�编�E�的错误�q�回��D��好用得多。通过�~�译器来��保正确的处理异常比通过�q�回值判断要好得多�?/div>
如果一个异常是致命的，不可恢复的。或者调用者去捕获它没有�Q何益处，使用unChecked异常�?/strong>

如果一个异常是可以恢复的，可以被调用者正��处理的�Q��用checked异常�?/div>
在��用unChecked异常�Ӟ��必须在在�Ҏ��声明中详�l�的说明该方法可能会抛出的unChekced异常。由调用者自己去军_��是否捕获unChecked异常

倒底什么时候��用checked异常�Q�什么时候��用unChecked异常�Q��ƈ没有一个绝对的标准。但是笔者可以给��Z��些徏�?/div>
当所有调用者必��d��理这个异常，可以让调用者进行重试操作；或者该异常相当于该�Ҏ��的第二个�q�回倹{��用checked异常�?/div>
�q�个异常仅是��数比较高��的调用者才能处理，一般的调用者不能正��的处理。��用unchecked异常。有能力处理的调用者可以进行高�U�处理，一般调用者干脆就不处理�?/div>
�q�个异常是一个非�怸�重的错误�Q�如数据库连接错误，文�g无法打开�{�。或者这些异常是与外部环境相关的。不是重试可以解决的。��用unchecked异常。因��U�异�怸�旦出玎ͼ�调用者根本无法处理�?/div>
如果不能��定�Ӟ��使用unchecked异常。�ƈ详细描述可能会抛出的异常,以让调用者决定是否进行处理�?/div>

3�Q?span style="font-family: 'Times New Roman';"> 设计一个新的异常类

在设计一个新的异常类�Ӟ��首先看看是否真正的需要这个异常类。一般情况下��量不要去设计新的异常类�Q�而是��量使用java中已�l�存在的异常�c�R�?/div>
�?div>java 代码
IllegalArgumentException, UnsupportedOperationException

不管是新的异常是chekced异常�q�是unChecked异常。我们都必须考虑异常的嵌套问题�?/div>

java 代码

public void methodA()throws ExceptionA{
         …..
          throw new ExceptionA();
}

�Ҏ��methodA声明会抛出ExceptionA.

public void methodB()throws ExceptionB

methodB声明会抛出ExceptionB,当在methodB�?法中调用methodA�Ӟ��ExceptionA是无法处理的,所以ExceptionA应该�l�箋往上抛出。一个办法是把methodB声明会抛�?ExceptionA.但这样已�l�改变了MethodB的方法签名。一旦改变，则所有调用methodB的方法都要进行改变�?/div>
另一个办法是把ExceptionA��装成ExceptionB�Q�然后再抛出。如果我们不把ExceptionA��装在ExceptionB中，��׃��׃��根异�怿�息，使得无法跟踪异常的原始出处�?/div>

java 代码

public void methodB()throws ExceptionB{
   try{
      methodA();
      ……
   }catch(ExceptionA ex){
     throw new ExceptionB(ex);
   }
}

   如上面的代码中，ExceptionB嵌套一个ExceptionA.我们暂且把ExceptionA�U�Cؓ“起因异常”,因�ؓExceptionA��D��了ExceptionB的��生。这��h��不��异常信息丢失�?/div>
所以我们在定义一个新的异常类�Ӟ��必须提供�q�样一个可以包含嵌套异常的构造函数。�ƈ有一个私有成员来保存�q�个“起因异常”�?/div>

java 代码

public Class ExceptionB extends Exception{
private Throwable cause;

public ExceptionB(String msg, Throwable ex){
super(msg);
this.cause = ex;
}

public ExceptionB(String msg){
super(msg);
}

public ExceptionB(Throwable ex){
this.cause = ex;
}
}
当然�Q�我们在调用printStackTrace�Ҏ��Ӟ��需要把所有的“起因异常”的信息也同时打印出来。所以我们需要覆写printStackTrace�Ҏ��来显�C�全部的异常栈跟�t�。包括嵌套异常的栈跟�t��?/div>

java 代码

public void printStackTrace(PrintStrean ps){
if(cause == null){
super.printStackTrace(ps);
}else{
ps.println(this);
cause.printStackTrace(ps);
}
}

一个完整的支持嵌套的checked异常�c�L��码如下。我们在�q�里暂且把它叫做NestedException

java 代码

public NestedException extends Exception{
private Throwable cause;
public NestedException (String msg){
super(msg);
}

public NestedException(String msg, Throwable ex){
super(msg);
This.cause = ex;
}

public Throwable getCause(){
return (this.cause == null ? this :this.cause);
}

public getMessage(){
String message = super.getMessage();
Throwable cause = getCause();
   if(cause != null){
     message = message + “;nested Exception is ” + cause;
   }
return message;
}
public void printStackTrace(PrintStream ps){
if(getCause == null){
    super.printStackTrace(ps);

}else{
ps.println(this);
getCause().printStackTrace(ps);
}
}

public void printStackTrace(PrintWrite pw){
if(getCause() == null){
    super.printStackTrace(pw);
}
else{
    pw.println(this);
    getCause().printStackTrace(pw);
}
}
public void printStackTrace(){
printStackTrace(System.error);
}
}

同样要设计一个unChecked异常�c�M��与上面一栗��只是需要��承RuntimeException�?/div>

4�Q?span style="font-family: 'Times New Roman';"> 如何记录异常

作�ؓ一个大型的应用�pȝ��都需要用日志文�g来记录系�l�的�q�行�Q�以便于跟踪和记录系�l�的�q�行情况。系�l�发生的异常理所当然的需要记录在日志�pȝ��中�?/div>

java 代码

public String getPassword(String userId)throws NoSuchUserException{
UserInfo user = userDao.queryUserById(userId);
If(user == null){
Logger.info(“找不到该用户信息,userId=”+userId);
throw new NoSuchUserException(“找不到该用户信息,userId=”+userId);
}
else{
return user.getPassword();
}
}

public void sendUserPassword(String userId)throws Exception {
UserInfo user = null;
try{
  user = getPassword(userId);
   //……..
sendMail();
//
}catch(NoSuchUserException ex)(
   logger.error(“找不到该用户信息:”+userId+ex);
   throw new Exception(ex);
}

我们注意刎ͼ�一个错误被记录了两��?在错误的��h��位置我们仅是以info�U�别�q�行记录。而在sendUserPassword�Ҏ��中，我们�q�把整个异常信息都记录了�?/div>
�W�者曾看到很多��目是这栯��录异常的�Q�不��三七二一�Q�只有遇到异常就把整个异常全部记录下。如果一个异常被不断的封装抛出多�ơ，那么��p��记录了多�ơ。那么异常倒底该在什么地方被记录�Q?/div>
异常应该在最初��生的位置记录�Q?/div>

如果必须捕获一个无法正��处理的异常�Q�仅仅是把它��装成另外一�U�异常往上抛出。不必再�ơ把已经被记录过的异常再�ơ记录�?/div>

如果捕获��C��个异常，但是�q�个异常是可以处理的。则无需要记录异�?/strong>

java 代码

public Date getDate(String str){
Date applyDate = null;
SimpleDateFormat format = new SimpleDateFormat(“MM/dd/yyyy”);
try{
applyDate = format.parse(applyDateStr);
}
catch(ParseException ex){
//乎略�Q�当格式错误�Ӟ��q�回null
}
return applyDate;
}

捕获��C��个未记录�q�的异常或外部系�l�异常时�Q�应该记录异常的详细信息

java 代码

try{
       ……
        String sql=”select * from userinfo”;
              Statement s = con.createStatement();
              ……
       Catch(SQLException sqlEx){
          Logger.error(“sql执行错误”+sql+sqlEx);
}


   �I�竟在哪里记录异�怿�息，及怎么记录异常信息�Q�可能是见仁见智的问题了。甚��x��些系�l�让异常�c�M��记录异常。当产生一个新异常对象�Ӟ��异常信息��p��自动记录�?/div>

java 代码

  public class BusinessException extends Exception {
      private void logTrace() {
          StringBuffer buffer=new StringBuffer();
          buffer.append("Business Error in Class: ");
          buffer.append(getClassName());
          buffer.append(",method: ");
          buffer.append(getMethodName());
          buffer.append(",messsage: ");
          buffer.append(this.getMessage());
          logger.error(buffer.toString());

}
public BusinessException(String s) {
         super(s);
race();
}
�q�似乎看��h��是十分美妙的�Q�其实必然导致了异常被重复记录。同时违反了“�cȝ��职责分配原则”�Q�是一�U�不好的设计。记录异�怸�属于异常�cȝ��行�ؓ�Q�记录异常应该由专门的日志系�l�去做。�ƈ且异常的记录信息是不断变化的。我们在记录异常同应该给更丰富些的信息。以利于我们能够�Ҏ��异常信息扑ֈ�问题的根源，以解决问题�?/div>
虽然我们对记录异常讨��Z��很多�Q�过多的��q�些反而��开发�h员更为疑惑，一�U�好的方式是为系�l�提供一个异常处理框架。由框架来决定是否记录异常和怎么记录异常。而不是由普通程序员��d��定。但是了解些�q�是有益的�?/div>
5�Q?nbsp;J2EE��目中的异常处理

目前,J2ee��目一般都会从逻辑上分为多层。比较经典的分�ؓ三层�Q�表�C�层�Q�业务层�Q�集成层(包括数据库访问和外部�pȝ��的访�?�?/div>
J2ee��目有着其复杂性，J2ee��目的异常处理需要特别注意几个问题�?/div>
在分布式应用�Ӟ��我们会遇到许多checked异常。所有RMI调用 �Q�包括EJB�q�程接口调用�Q�都会抛出java.rmi.RemoteException;同时RemoteException是checked异常�Q�当�?们在业务�pȝ��中进行远�E�调用时�Q�我们都需要编写大量的代码来处理这些checked异常。而一旦发生RemoteException�q�些checked�?常对�pȝ��是非�怸�重的�Q�几乎没有�Q何进行重试的可能。也��是��_��当出现RemoteException�q�些可怕的checked异常�Q�我们没有�Q何重试的必要性，却必��要�~�写大量的try…catch代码��d��理它。一般我们都是在最底层�q�行RMI调用�Q�只要有一个RMI调用�Q�所有上层的接口都会要求抛出 RemoteException异常。因为我们处理RemoteException的方式就是把它��l�往上抛。这样一来就破坏了我们业务接口�?RemoteException�q�些J2EE�pȝ��U�的异常严重的媄响了我们的业务接口。我们对�pȝ��q�行分层的目的就是减��系�l�之间的依赖�Q�每一层的技术改变不至于影响到其它层�?/div>

java 代码

//
public class UserSoaImpl implements UserSoa{
   public UserInfo getUserInfo(String userId)throws RemoteException{
      //……
�q�程�Ҏ��调用.
      //……
   }
}
public interface UserManager{
   public UserInfo getUserInfo(Stirng userId)throws RemoteException;
}

同样JDBC讉K��都会抛出SQLException的checked异常�?/div>

��Z��避免�pȝ��U�的checked异常对业务系�l�的深度侵入�Q�我们可以�ؓ 业务�Ҏ��定义一个业务系�l�自��q��异常。针对像SQLException,RemoteException�q�些非常严重的异常，我们可以新定义一�?unChecked的异常，然后把SQLException�Q�RemoteException��装成unChecked异常后抛出�?/div>
如果�q�个�pȝ��U�的异常是要交由上一�U�调用者处理的�Q�可以新定义一个checked的业务异常，然后把系�l��的异常封存装成业务��的异常后再抛出�?/div>
一般地�Q�我们需要定义一个unChecked异常�Q�让集成层接口的所有方法都声明抛出�q�unChecked异常�?/span>

java 代码

public DataAccessException extends RuntimeException{
……
}
public interface UserDao{
public String getPassword(String userId)throws DataAccessException;
}

public class UserDaoImpl implements UserDAO{
public String getPassword(String userId)throws DataAccessException{
String sql = “select password from userInfo where userId= ‘”+userId+”’”;
try{
    …
     //JDBC调用
     s.executeQuery(sql);
    …
   }catch(SQLException ex){
      throw new DataAccessException(“数据库查询失�?#8221;+sql,ex);
   }
}
}

定义一个checked的业务异常，让业务层的接口的所有方法都声明抛出Checked异常.

java 代码

public class BusinessException extends Exception{
…..
}

public interface UserManager{
   public Userinfo copyUserInfo(Userinfo user)throws BusinessException{
      Userinfo newUser = null;
      try{
        newUser = (Userinfo)user.clone();
}catch(CloneNotSupportedException ex){
throw new BusinessException(“不支持clone�Ҏ��:”+Userinfo.class.getName(),ex);
}
}
}

J2ee表示层应该是一个很薄的层，主要的功能�ؓ�Q�获得页面请求，把页面的参数�l�装成POJO对象�Q�调用相应的业务�Ҏ��Q�然后进行页面�{发，把相应的业务数据呈现�l�页面。表�C�层需要注意一个问题，表示层需要对数据的合法性进行校验，比如某些录入域不能�ؓ�I�，字符长度校验�{��?/div>
J2ee从页面所有传�l�后台的参数都是字符型的�Q�如果要求输入数值或日期�c�d��的参数时�Q�必��L��字符��D�{换�ؓ相应的数值或日期倹{�?/div>
如果表示层代码校验参��C��合法�Ӟ��应该�q�回到原始页面，让用户重新录入数据，�q�提�C�相关的错误信息�?/div>

通常把一个从��面传来的参数�{换�ؓ数��|��我们可以看到�q�样的代�?/div>

java 代码

ModeAndView handleRequest(HttpServletRequest request,HttpServletResponse response)throws Exception{
   String ageStr = request.getParameter(“age”);
   int age = Integer.parse(ageStr);
   …………

String birthDayStr = request.getParameter(“birthDay”);
SimpleDateFormat format = new SimpleDateFormat(“MM/dd/yyyy”);
Date birthDay = format.parse(birthDayStr);

}

上面的代码应该经常见刎ͼ�但是当用户从��面录入一个不能�{换�ؓ整型的字�W�或一个错误的日期倹{�?/div>
Integer.parse()�Ҏ��被抛��Z��?NumberFormatException的unChecked异常。但是这个异常绝对不是一个致命的异常,一般当用户在页面的录入域录入的��g��合法 �Ӟ��我们应该提示用户�q�行重新录入。但是一旦抛出unchecked异常�Q�就没有重试的机会了。像�q�样的代码造成大量的异�怿�息显�C�到��面。��我们的系�l?看�v来非常的脆弱�?/div>
同样�Q�SimpleDateFormat.parse()�Ҏ��也会抛出ParseException的unChecked异常�?/div>
�q�种情况我们都应该捕莯��些unChecked异常�Q��ƈ�l�提�C�用户重新录入�?/div>

java 代码

ModeAndView handleRequest(HttpServletRequest request,HttpServletResponse response)throws Exception{
   String ageStr = request.getParameter(“age”);
String birthDayStr = request.getParameter(“birthDay”);
   int age = 0;
Date birthDay = null;
try{
age=Integer.parse(ageStr);
   }catch(NumberFormatException ex){
     error.reject(“age”,”不是合法的整数�?#8221;);
   }
   …………

try{
SimpleDateFormat format = new SimpleDateFormat(“MM/dd/yyyy”);
birthDay = format.parse(birthDayStr);
}catch(ParseException ex){
error.reject(“birthDay”,”不是合法的日期，请录�?#8217;MM/dd/yyy’格式的日�?#8221;);
}

}

在表�C�层一定要弄清楚调用方法的是否会抛出unChecked异常�Q�什么情况下会抛��些异常，�q�作出正��的处理�?/strong>

在表�C�层调用�pȝ��的业务方法，一般情况下是无需要捕获异常的。如果调用的业务�Ҏ��抛出的异常相当于�W�二个返回值时�Q�在�q�种情况下是需要捕�?/strong>

思无 2011-06-27 16:02 发表评论

思无 — Thu, 09 Jun 2011 05:30:00 GMT
做了�q�么多年前台的东西，�q�是�W�一�ơ捧起前台相关的书来看�?br />�q�次看得是Robert Hoekman的第二本书，��M��感觉看下来，比较受用�Q�重点讲了下面几个词汇�?br />��单，清楚�Q�预期，反馈�?br />��单：界面要��够的��单，不要多，更不要无必要�?#8220;�?#8220;�Q�要�?#8220;�?#8220;的东襉K��藏�v来，多指不常用的�Q�比�?#8220;高��“的功能�?br />清楚�Q�突��Z��么要清楚�Q�突��Z��么可以通过颜色�Q�视觉习惯等�Ҏ��?br />预期�Q�用戯��知道自己操作的进度，比如填写多页表单�?br />反馈�Q�让用户知道自己操作的结果的提示�Q�操作完��面需要做出反馈以提示用户操作的结果�?br />
该书从设计用��L��陆开始，中间�I�插了一些网站小模块的设计，到最�l�用户退出系�l�的设计。比较完整的�?1个瞬间讲�q�C��一个用��h��览网站的�q�程�?br />
�l�自己最大的提示�Q�老生常谈�Q�站在��用者的角度�Q�方便��用者的目的�Q��ƈ��可能依靠��用者的“抱�?#8221;�Q�改�q�系�l�的设计�Q�提高��用者的效率�?img src ="http://www.tkk7.com/ilovebabyfat/aggbug/351973.html" width = "1" height = "1" />

思无 2011-06-09 13:30 发表评论

java.lang.ClassCastException: oracle.sql.CLOB

思无 — Tue, 07 Jun 2011 05:38:00 GMT

转自
http://spring3000.iteye.com/blog/372482
    oracle.sql.CLOB clob =null;
    stmt = conn.createStatement();
    rs = stmt.executeQuery(sql);
    if (rs.next()) {
        System.out.println(rs.getClob(column).getClass());
        clob = (oracle.sql.CLOB) rs.getClob(column);
        out = new BufferedWriter(clob.getCharacterOutputStream());
        in = new BufferedReader(new StringReader(data));
    }
�q�个代码很奇怪，看试没有一炚w��题，但是�Q�项目跑��h��后，代码
clob = (oracle.sql.CLOB) rs.getClob(column);
都会抛出java.lang.ClassCastException: oracle.sql.CLOB异常�Q�WEB容器使用的是TOMCAT5.5�Q?先以为是�c�d��转换的问题，
System.out.println(rs.getClob(column).getClass());
但打印出来的�?span style="background-color: #00ffff;">oracle.sql.clob
后又以�ؓ是驱动的问题�Q�把classes12.jar换成了ojdbc14.jar
可问题还没有解决

解决的方法：

在网上狂找，�l�于扑ֈ�一位高人写的一��高水��^的文章（主要是把我的问题�l�解决了�Q�哈�Q?nbsp;

是因为驱动包重复了，我理解�ؓ�c�重名，我��用的是tomcat数据源，哪么�Q?TOMCAT_HOME$\comm\lib目录下需�?span style="background-color: #00ffff;">oracle驱动包，是给tomcat创徏jndi数据源时用的�Q�而项目中也要�?span style="background-color: #00ffff;">oracle驱动包，是给�E�序�~�译用的�Q�最后��用eclilpse�?span style="background-color: #ffff00;">java build path�q�行外部引用�Q��用应用程序编译通过�Q�但也不会把ojdbc14.jar的驱动包引入到发布目录，再试�Q�果然解决了问题�?/div>

思无 2011-06-07 13:38 发表评论

JQuery

思无 — Tue, 31 May 2011 08:19:00 GMT
Selectors

Selector Example Selects

* $("*") All elements

#id $("#lastname") The element with id=lastname

.class $(".intro") All elements with class="intro"

element $("p") All p elements

.class.class $(".intro.demo") All elements with the classes "intro" and "demo"

:first $("p:first") The first p element

:last $("p:last") The last p element

:even $("tr:even") All even tr elements

:odd $("tr:odd") All odd tr elements

:eq(index) $("ul li:eq(3)") The fourth element in a list (index starts at 0)

:gt(no) $("ul li:gt(3)") List elements with an index greater than 3

:lt(no) $("ul li:lt(3)") List elements with an index less than 3

:not(selector) $("input:not(:empty)") All input elements that are not empty

:header $(":header") All header elements h1, h2 ...

:animated $(":animated") All animated elements

:contains(text) $(":contains('W3Schools')") All elements which contains the text

:empty $(":empty") All elements with no child (elements) nodes

:hidden $("p:hidden") All hidden p elements

:visible $("table:visible") All visible tables

s1,s2,s3 $("th,td,.intro") All elements with matching selectors

[attribute] $("[href]") All elements with a href attribute

[attribute=value] $("[href='default.htm']") All elements with a href attribute value equal to "default.htm"

[attribute!=value] $("[href!='default.htm']") All elements with a href attribute value not equal to "default.htm"

[attribute$=value] $("[href$='.jpg']") All elements with a href attribute value ending with ".jpg"

:input $(":input") All input elements

:text $(":text") All input elements with type="text"

:password $(":password") All input elements with type="password"

:radio $(":radio") All input elements with type="radio"

:checkbox $(":checkbox") All input elements with type="checkbox"

:submit $(":submit") All input elements with type="submit"

:reset $(":reset") All input elements with type="reset"

:button $(":button") All input elements with type="button"

:image $(":image") All input elements with type="image"

:file $(":file") All input elements with type="file"

:enabled $(":enabled") All enabled input elements

:disabled $(":disabled") All disabled input elements

:selected $(":selected") All selected input elements

:checked $(":checked") All checked input elements

Events

Method Description

bind() Add one or more event handlers to matching elements

blur() Triggers, or binds a function to the blur event of selected elements

change() Triggers, or binds a function to the change event of selected elements

click() Triggers, or binds a function to the click event of selected elements

dblclick() Triggers, or binds a function to the dblclick event of selected elements

delegate() Add one or more event handlers to current, or future, specified child elements of the matching elements

die() Remove all event handlers added with the live() function

error() Triggers, or binds a function to the error event of selected elements

event.currentTarget The current DOM element within the event bubbling phase

event.data Contains the optional data passed to jQuery.fn.bind when the current executing handler was bound

event.isDefaultPrevented() Returns whether event.preventDefault() was called for the event object

event.isImmediatePropagationStopped() Returns whether event.stopImmediatePropagation() was called for the event object

event.isPropagationStopped() Returns whether event.stopPropagation() was called for the event object

event.pageX The mouse position relative to the left edge of the document

event.pageY The mouse position relative to the top edge of the document

event.preventDefault() Prevents the default action of the event

event.relatedTarget The other DOM element involved in the event, if any

event.result This attribute contains the last value returned by an event handler that was triggered by this event, unless the value was undefined

event.stopImmediatePropagation() Prevents other event handlers from being called

event.stopPropagation() Prevents the event from bubbling up the DOM tree, preventing any parent handlers from being notified of the event

event.target The DOM element that initiated the event

event.timeStamp This attribute returns the number of milliseconds since January 1, 1970, when the event is triggered

event.type Describes the nature of the event

event.which Which key or button was pressed for a key or button event

focus() Triggers, or binds a function to the focus event of selected elements

focusin() Binds a function to the focusin event of selected elements

focusout() Binds a function to the focusout event of selected elements

hover() Binds one or two functions to the hover event of selected elements

keydown() Triggers, or binds a function to the keydown event of selected elements

keypress() Triggers, or binds a function to the keypress event of selected elements

keyup() Triggers, or binds a function to the keyup event of selected elements

live() Add one or more event handlers to current, or future, matching elements

load() Triggers, or binds a function to the load event of selected elements

mousedown() Triggers, or binds a function to the mouse down event of selected elements

mouseenter() Triggers, or binds a function to the mouse enter event of selected elements

mouseleave() Triggers, or binds a function to the mouse leave event of selected elements

mousemove() Triggers, or binds a function to the mouse move event of selected elements

mouseout() Triggers, or binds a function to the mouse out event of selected elements

mouseover() Triggers, or binds a function to the mouse over event of selected elements

mouseup() Triggers, or binds a function to the mouse up event of selected elements

one() Add one or more event handlers to matching elements. This handler can only be triggered once per element

ready() Binds a function to the ready event of a document
(when an HTML document is ready to use)

resize() Triggers, or binds a function to the resize event of selected elements

scroll() Triggers, or binds a function to the scroll event of selected elements

select() Triggers, or binds a function to the select event of selected elements

submit() Triggers, or binds a function to the submit event of selected elements

toggle() Binds two or more functions to the toggle between for the click event for selected elements

trigger() Triggers all events bound to the selected elements

triggerHandler() Triggers all functions bound to a specified event for the selected elements

unbind() Remove an added event handler from selected elements

undelegate() Remove an event handler to selected elements, now or in the future

unload() Triggers, or binds a function to the unload event of selected elements

Effect
Method Description

animate() Performs a custom animation (of a set of CSS properties) for selected elements

clearQueue() Removes all queued functions for the selected element

delay() Sets a delay for all queued functions for the selected element

dequeue() Runs the next queued functions for the selected element

fadeIn() Gradually changes the opacity, for selected elements, from hidden to visible

fadeOut() Gradually changes the opacity, for selected elements, from visible to hidden

fadeTo() Gradually changes the opacity, for selected elements, to a specified opacity

hide() Hides selected elements

queue() Shows the queued functions for the selected element

show() Shows hidden selected elements

slideDown() Gradually changes the height, for selected elements, from hidden to visible

slideToggle() Toggles between slideUp() and slideDown() for selected elements

slideUp() Gradually changes the height, for selected elements, from visible to hidden

stop() Stops a running animation on selected elements

toggle() Toggles between hide() and show(), or custom functions, for selected elements

HTML

Method Description

addClass() Adds one or more classes (for CSS) to selected elements

after() Inserts content after selected elements

append() Inserts content at the end of (but still inside) selected elements

appendTo() Inserts content at the end of (but still inside) selected elements

attr() Sets or returns an attribute and value of selected elements

before() Inserts content before selected elements

clone() Makes a copy of selected elements

detach() Removes (but keeps a copy of) selected elements

empty() Removes all child elements and content from selected elements

hasClass() Checks if any of the selected elements have a specified class (for CSS)

html() Sets or returns the content of selected elements

insertAfter() Inserts HTML markup or elements after selected elements

insertBefore() Inserts HTML markup or elements before selected elements

prepend() Inserts content at the beginning of (but still inside) selected elements

prependTo() Inserts content at the beginning of (but still inside) selected elements

remove() Removes selected elements

removeAttr() Removes an attribute from selected elements

removeClass() Removes one or more classes (for CSS) from selected elements

replaceAll() Replaces selected elements with new content

replaceWith() Replaces selected elements with new content

text() Sets or returns the text content of selected elements

toggleClass() Toggles between adding/removing one or more classes (for CSS) from selected elements

unwrap() Removes the parent element of the selected elements

val() Sets or returns the value attribute of the selected elements (form elements)

wrap() Wraps specified HTML element(s) around each selected element

wrapAll() Wraps specified HTML element(s) around all selected elements

wrapInner() Wraps specified HTML element(s) around the content of each selected element

CSS

Method Description

addClass() Adds one or more classes to selected elements

css() Sets or returns one or more style properties for selected elements

hasClass() Checks if any of the selected elements have a specified class

height() Sets or returns the height of selected elements

offset() Sets or returns the position (relative to the document) for selected elements

offsetParent() Returns the first parent element that is positioned

position() Returns the position (relative to the parent element) of the first selected element

removeClass() Removes one or more classes from selected elements

scrollLeft() Sets or returns the horizontal position of the scrollbar for the selected elements

scrollTop() Sets or returns the vertical position of the scrollbar for the selected elements

toggleClass() Toggles between adding/removing one or more classes from selected elements

width() Sets or returns the width of selected elements

AJAX

Method Description

$.ajax() Performs an AJAX request

ajaxComplete() Specifies a function to run when the AJAX request completes

ajaxError() Specifies a function to run when the AJAX request completes with an error

ajaxSend() Specifies a function to run before the AJAX request is sent

$.ajaxSetup() Sets the default values for future AJAX requests

ajaxStart() Specifies a function to run when the first AJAX request begins

ajaxStop() Specifies a function to run when all AJAX requests have completed

ajaxSuccess() Specifies a function to run an AJAX request completes successfully

$.get() Loads data from a server using an AJAX HTTP GET request

$.getJSON() Loads JSON-encoded data from a server using a HTTP GET request

$.getScript() Loads (and executes) a JavaScript from the a server using an AJAX HTTP GET request

load() Loads data from a server and puts the returned HTML into the selected element

$.param() Creates a serialized representation of an array or object (can be used as URL query string for AJAX requests)

$.post() Loads data from a server using an AJAX HTTP POST request

serialize() Encodes a set of form elements as a string for submission

serializeArray() Encodes a set of form elements as an array of names and values

MISC

Method Description

data() Attaches data to, or gets data from, selected elements

each() Run a function for each element matched by the jQuery selector

get() Get the DOM elements matched by the selector

index() Search for a given element from among the matched elements

$.noConflict() Release jQuery's control of the $ variable

$.param() Creates a serialized representation of an array or object (can be used as URL query string for AJAX requests)

removeData() Removes a previously-stored piece of data

size() Return the number of DOM elements matched by the jQuery selector

toArray() Retrieve all the DOM elements contained in the jQuery set, as an array

思无 2011-05-31 16:19 发表评论

Selector	Example	Selects
*	$("*")	All elements
#id	$("#lastname")	The element with id=lastname
.class	$(".intro")	All elements with class="intro"
element	$("p")	All p elements
.class.class	$(".intro.demo")	All elements with the classes "intro" and "demo"

:first	$("p:first")	The first p element
:last	$("p:last")	The last p element
:even	$("tr:even")	All even tr elements
:odd	$("tr:odd")	All odd tr elements

:eq(index)	$("ul li:eq(3)")	The fourth element in a list (index starts at 0)
:gt(no)	$("ul li:gt(3)")	List elements with an index greater than 3
:lt(no)	$("ul li:lt(3)")	List elements with an index less than 3
:not(selector)	$("input:not(:empty)")	All input elements that are not empty

:header	$(":header")	All header elements h1, h2 ...
:animated	$(":animated")	All animated elements

:contains(text)	$(":contains('W3Schools')")	All elements which contains the text
:empty	$(":empty")	All elements with no child (elements) nodes
:hidden	$("p:hidden")	All hidden p elements
:visible	$("table:visible")	All visible tables

s1,s2,s3	$("th,td,.intro")	All elements with matching selectors

[attribute]	$("[href]")	All elements with a href attribute
[attribute=value]	$("[href='default.htm']")	All elements with a href attribute value equal to "default.htm"
[attribute!=value]	$("[href!='default.htm']")	All elements with a href attribute value not equal to "default.htm"
[attribute$=value]	$("[href$='.jpg']")	All elements with a href attribute value ending with ".jpg"

:input	$(":input")	All input elements
:text	$(":text")	All input elements with type="text"
:password	$(":password")	All input elements with type="password"
:radio	$(":radio")	All input elements with type="radio"
:checkbox	$(":checkbox")	All input elements with type="checkbox"
:submit	$(":submit")	All input elements with type="submit"
:reset	$(":reset")	All input elements with type="reset"
:button	$(":button")	All input elements with type="button"
:image	$(":image")	All input elements with type="image"
:file	$(":file")	All input elements with type="file"

:enabled	$(":enabled")	All enabled input elements
:disabled	$(":disabled")	All disabled input elements
:selected	$(":selected")	All selected input elements
:checked	$(":checked")	All checked input elements

Method	Description
bind()	Add one or more event handlers to matching elements
blur()	Triggers, or binds a function to the blur event of selected elements
change()	Triggers, or binds a function to the change event of selected elements
click()	Triggers, or binds a function to the click event of selected elements
dblclick()	Triggers, or binds a function to the dblclick event of selected elements
delegate()	Add one or more event handlers to current, or future, specified child elements of the matching elements
die()	Remove all event handlers added with the live() function
error()	Triggers, or binds a function to the error event of selected elements
event.currentTarget	The current DOM element within the event bubbling phase
event.data	Contains the optional data passed to jQuery.fn.bind when the current executing handler was bound
event.isDefaultPrevented()	Returns whether event.preventDefault() was called for the event object
event.isImmediatePropagationStopped()	Returns whether event.stopImmediatePropagation() was called for the event object
event.isPropagationStopped()	Returns whether event.stopPropagation() was called for the event object
event.pageX	The mouse position relative to the left edge of the document
event.pageY	The mouse position relative to the top edge of the document
event.preventDefault()	Prevents the default action of the event
event.relatedTarget	The other DOM element involved in the event, if any
event.result	This attribute contains the last value returned by an event handler that was triggered by this event, unless the value was undefined
event.stopImmediatePropagation()	Prevents other event handlers from being called
event.stopPropagation()	Prevents the event from bubbling up the DOM tree, preventing any parent handlers from being notified of the event
event.target	The DOM element that initiated the event
event.timeStamp	This attribute returns the number of milliseconds since January 1, 1970, when the event is triggered
event.type	Describes the nature of the event
event.which	Which key or button was pressed for a key or button event
focus()	Triggers, or binds a function to the focus event of selected elements
focusin()	Binds a function to the focusin event of selected elements
focusout()	Binds a function to the focusout event of selected elements
hover()	Binds one or two functions to the hover event of selected elements
keydown()	Triggers, or binds a function to the keydown event of selected elements
keypress()	Triggers, or binds a function to the keypress event of selected elements
keyup()	Triggers, or binds a function to the keyup event of selected elements
live()	Add one or more event handlers to current, or future, matching elements
load()	Triggers, or binds a function to the load event of selected elements
mousedown()	Triggers, or binds a function to the mouse down event of selected elements
mouseenter()	Triggers, or binds a function to the mouse enter event of selected elements
mouseleave()	Triggers, or binds a function to the mouse leave event of selected elements
mousemove()	Triggers, or binds a function to the mouse move event of selected elements
mouseout()	Triggers, or binds a function to the mouse out event of selected elements
mouseover()	Triggers, or binds a function to the mouse over event of selected elements
mouseup()	Triggers, or binds a function to the mouse up event of selected elements
one()	Add one or more event handlers to matching elements. This handler can only be triggered once per element
ready()	Binds a function to the ready event of a document (when an HTML document is ready to use)
resize()	Triggers, or binds a function to the resize event of selected elements
scroll()	Triggers, or binds a function to the scroll event of selected elements
select()	Triggers, or binds a function to the select event of selected elements
submit()	Triggers, or binds a function to the submit event of selected elements
toggle()	Binds two or more functions to the toggle between for the click event for selected elements
trigger()	Triggers all events bound to the selected elements
triggerHandler()	Triggers all functions bound to a specified event for the selected elements
unbind()	Remove an added event handler from selected elements
undelegate()	Remove an event handler to selected elements, now or in the future
unload()	Triggers, or binds a function to the unload event of selected elements

Method	Description
animate()	Performs a custom animation (of a set of CSS properties) for selected elements
clearQueue()	Removes all queued functions for the selected element
delay()	Sets a delay for all queued functions for the selected element
dequeue()	Runs the next queued functions for the selected element
fadeIn()	Gradually changes the opacity, for selected elements, from hidden to visible
fadeOut()	Gradually changes the opacity, for selected elements, from visible to hidden
fadeTo()	Gradually changes the opacity, for selected elements, to a specified opacity
hide()	Hides selected elements
queue()	Shows the queued functions for the selected element
show()	Shows hidden selected elements
slideDown()	Gradually changes the height, for selected elements, from hidden to visible
slideToggle()	Toggles between slideUp() and slideDown() for selected elements
slideUp()	Gradually changes the height, for selected elements, from visible to hidden
stop()	Stops a running animation on selected elements
toggle()	Toggles between hide() and show(), or custom functions, for selected elements

Method	Description
addClass()	Adds one or more classes (for CSS) to selected elements
after()	Inserts content after selected elements
append()	Inserts content at the end of (but still inside) selected elements
appendTo()	Inserts content at the end of (but still inside) selected elements
attr()	Sets or returns an attribute and value of selected elements
before()	Inserts content before selected elements
clone()	Makes a copy of selected elements
detach()	Removes (but keeps a copy of) selected elements
empty()	Removes all child elements and content from selected elements
hasClass()	Checks if any of the selected elements have a specified class (for CSS)
html()	Sets or returns the content of selected elements
insertAfter()	Inserts HTML markup or elements after selected elements
insertBefore()	Inserts HTML markup or elements before selected elements
prepend()	Inserts content at the beginning of (but still inside) selected elements
prependTo()	Inserts content at the beginning of (but still inside) selected elements
remove()	Removes selected elements
removeAttr()	Removes an attribute from selected elements
removeClass()	Removes one or more classes (for CSS) from selected elements
replaceAll()	Replaces selected elements with new content
replaceWith()	Replaces selected elements with new content
text()	Sets or returns the text content of selected elements
toggleClass()	Toggles between adding/removing one or more classes (for CSS) from selected elements
unwrap()	Removes the parent element of the selected elements
val()	Sets or returns the value attribute of the selected elements (form elements)
wrap()	Wraps specified HTML element(s) around each selected element
wrapAll()	Wraps specified HTML element(s) around all selected elements
wrapInner()	Wraps specified HTML element(s) around the content of each selected element

Method	Description
addClass()	Adds one or more classes to selected elements
css()	Sets or returns one or more style properties for selected elements
hasClass()	Checks if any of the selected elements have a specified class
height()	Sets or returns the height of selected elements
offset()	Sets or returns the position (relative to the document) for selected elements
offsetParent()	Returns the first parent element that is positioned
position()	Returns the position (relative to the parent element) of the first selected element
removeClass()	Removes one or more classes from selected elements
scrollLeft()	Sets or returns the horizontal position of the scrollbar for the selected elements
scrollTop()	Sets or returns the vertical position of the scrollbar for the selected elements
toggleClass()	Toggles between adding/removing one or more classes from selected elements
width()	Sets or returns the width of selected elements

Method	Description
$.ajax()	Performs an AJAX request
ajaxComplete()	Specifies a function to run when the AJAX request completes
ajaxError()	Specifies a function to run when the AJAX request completes with an error
ajaxSend()	Specifies a function to run before the AJAX request is sent
$.ajaxSetup()	Sets the default values for future AJAX requests
ajaxStart()	Specifies a function to run when the first AJAX request begins
ajaxStop()	Specifies a function to run when all AJAX requests have completed
ajaxSuccess()	Specifies a function to run an AJAX request completes successfully
$.get()	Loads data from a server using an AJAX HTTP GET request
$.getJSON()	Loads JSON-encoded data from a server using a HTTP GET request
$.getScript()	Loads (and executes) a JavaScript from the a server using an AJAX HTTP GET request
load()	Loads data from a server and puts the returned HTML into the selected element
$.param()	Creates a serialized representation of an array or object (can be used as URL query string for AJAX requests)
$.post()	Loads data from a server using an AJAX HTTP POST request
serialize()	Encodes a set of form elements as a string for submission
serializeArray()	Encodes a set of form elements as an array of names and values

Method	Description
data()	Attaches data to, or gets data from, selected elements
each()	Run a function for each element matched by the jQuery selector
get()	Get the DOM elements matched by the selector
index()	Search for a given element from among the matched elements
$.noConflict()	Release jQuery's control of the $ variable
$.param()	Creates a serialized representation of an array or object (can be used as URL query string for AJAX requests)
removeData()	Removes a previously-stored piece of data
size()	Return the number of DOM elements matched by the jQuery selector
toArray()	Retrieve all the DOM elements contained in the jQuery set, as an array

亚洲91精品麻豆国产系列在线 ,亚洲国产一区二区视频网站,亚洲色大成WWW亚洲女子

JQGrid

IE长时间等待服务器响应�Q�显�C�页面无法显�C�的问题

Internet Explorer error "connection timed out" when server does not respond问题得到解决�?br />其实可以说问题无法得到解冟뀂我怎么可能让每个用户去修改他们的注册表么�?br />看来只能采取异步的请求方式了�?/span>

Actuate使用�ȝ��

http://trials.adobe.com/Applications/.../FB3_WWEJ.exe大小�Q� 385.84 MB �Q� 已经压羃�?nbsp;Flex Builder 3 安装文�g需要注册登录，才可下蝲�?/font>

���单的session ���时提新

(�?J2EE��目异常处理

java.lang.ClassCastException: oracle.sql.CLOB

JQuery

Internet Explorer error "connection timed out" when server does not respond
问题得到解决�?br />其实可以说问题无法得到解冟뀂我怎么可能让每个用户去修改他们的注册表么�?br />
看来只能采取异步的请求方式了�?/span>

http://trials.adobe.com/Applications/.../FB3_WWEJ.exe
大小�Q�　385.84 MB　�Q�　已经压羃�?nbsp;Flex Builder 3 安装文�g
需要注册登录，才可下蝲�?/font>

��单的session ��时提新