Posted on 2007-12-24 13:36
G_G 閱讀(1102)
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EJB
為了了解hbm的rmic真正的威力還有為了更近一步了解；在此特使用文本和dos命令完成這次學習。
在此讀者最好先做好不使用 IDE 的準備（^_^!? 文本編輯，dos編輯和運行）
閱讀需要：
?java,javac,
rmiregistry,rmic,ant 等命令有所涉及（只是簡單使用，不會也別怕?。?/font>
可行性使用說明：
? 持久層程序員成功開啟rmiregistry服務，在局域網內其他使用數據的隊友就只要加載
hbmBean 的映射jar和 dao接口jar后 就可以取得數據。根本感覺不到hbn使用。
優點：
1.其他隊員編譯classpath中不需要hbm的任何東西，跟關注自己東西。
2.強制接口規范。
3.正交編程。
4.DAO測試性能方便。
5.這還是 EJB 原理，轉換容易。
缺點：
1.rmic 突破放火墻能力有限，可以換成EJB
2.大型項目注冊服務器，配置繁瑣，可以使用EJB3.0
?
使用:
1.jdk1.5
2.jar使用（為了用hbm）?????
? ? jta.jar;
??? asm.jar;
? ? commons-collections-2.1.1.jar;
? ? commons-logging-1.0.4.jar;
? ? hibernate3.jar;
??? dom4j-1.6.1.jar;
??? cglib-2.1.3.jar;
? ? antlr-2.7.5H3.jar
??? MYSQL.jar
3.ant1.7(使用hbm生成 mapping;config...)
4.Middlegen-Hibernate-r5 同上
5.使用文件路徑
? E:\rmi_test->
???? +-src
???? --hibernate3.xml
???? --hibernate3_ant.properties
開始：
?1>使用ant 對 hbm? 配置映射參考 ：ant 項目實際 并使用 hibernate3.xml
??? dos 輸入 -> ant -f hibernate3.xml ddl2hbm (使用了Middlegen-Hibernate-r5)
???????????? -> ant -f hibernate3.xml create_config (hibernate.cfg.xml建立)
??? 在 hibernate.cfg.xml中添加-> <mapping resource="hibernate\Liu.hbm.xml" />
??? dos 輸入 -> ant -f hibernate3.xml hbm2java
?變成+-src
?????? |-hibernate
????????? |-Liu.hbm.xml
????????? |-Liu.java
?????? |-hbmConfig
????????? |-hibernate.cfg.xml
?2>手動建hbmHibernateSessionFactory在hbmConfig文件中(為了簡單copy->myeclipes生成的)
package???hbmConfig;?
import?org.hibernate.HibernateException;
import?org.hibernate.Session;
import?org.hibernate.cfg.Configuration;
/**
?*?Configures?and?provides?access?to?Hibernate?sessions,?tied?to?the
?*?current?thread?of?execution.??Follows?the?Thread?Local?Session
?*?pattern,?see?{@link?http://hibernate.org/42.html}.
?*/
public?class?HibernateSessionFactory?{
????/**?
?????*?Location?of?hibernate.cfg.xml?file.
?????*?NOTICE:?Location?should?be?on?the?classpath?as?Hibernate?uses
?????*?#resourceAsStream?style?lookup?for?its?configuration?file.?That
?????*?is?place?the?config?file?in?a?Java?package?-?the?default?location
?????*?is?the?default?Java?package.<br><br>
?????*?Examples:?<br>
?????*?<code>CONFIG_FILE_LOCATION?=?"/hibernate.conf.xml".?
?????*?CONFIG_FILE_LOCATION?=?"/com/foo/bar/myhiberstuff.conf.xml".</code>?
?????*/
????private?static?String?CONFIG_FILE_LOCATION?=?"/hbmConfig/hibernate.cfg.xml";
????/**?Holds?a?single?instance?of?Session?*/
????private?static?final?ThreadLocal<Session>?threadLocal?=?new?ThreadLocal<Session>();
????/**?The?single?instance?of?hibernate?configuration?*/
????private?static?final?Configuration?cfg?=?new?Configuration();
????/**?The?single?instance?of?hibernate?SessionFactory?*/
????private?static?org.hibernate.SessionFactory?sessionFactory;
????/**
?????*?Returns?the?ThreadLocal?Session?instance.??Lazy?initialize
?????*?the?<code>SessionFactory</code>?if?needed.
?????*
?????*??@return?Session
?????*??@throws?HibernateException
?????*/
????public?static?Session?currentSession()?throws?HibernateException?{
????????Session?session?=?(Session)?threadLocal.get();
????????if?(session?==?null)?{
????????????if?(sessionFactory?==?null)?{
????????????????try?{
????????????????????cfg.configure(CONFIG_FILE_LOCATION);
????????????????????sessionFactory?=?cfg.buildSessionFactory();
????????????????}
????????????????catch?(Exception?e)?{
????????????????????System.err.println("%%%%?Error?Creating?SessionFactory?%%%%");
????????????????????e.printStackTrace();
????????????????}
????????????}
????????????session?=?sessionFactory.openSession();
????????????threadLocal.set(session);
????????}
????????return?session;
????}
????/**
?????*??Close?the?single?hibernate?session?instance.
?????*
?????*??@throws?HibernateException
?????*/
????public?static?void?closeSession()?throws?HibernateException?{
????????Session?session?=?(Session)?threadLocal.get();
????????threadLocal.set(null);
????????if?(session?!=?null)?{
????????????session.close();
????????}
????}
????/**
?????*?Default?constructor.
?????*/
????private?HibernateSessionFactory()?{
????}
}
dos中編譯->
E:\rmi_test\src>javac -cp?? .;D:\hbn\hibernate-3.2\hibernate-3.2.5.ga\hibernate-3.2\hibernate3.jar???
hbmConfig/*.java
3>DAO實現
接口->
package?rmic;
import?java.rmi.Remote;
import?java.rmi.RemoteException;
public?interface?IHello?extends?Remote?{
????public?String?sayHello(String?id)?throws?RemoteException;
}
實現類->
package?rmic;
import?java.rmi.Naming;
import?java.rmi.RemoteException;
import?java.rmi.server.UnicastRemoteObject;
//取消顯示指定的編譯器警告！
//參考?：?http://gceclub.sun.com.cn/Java_Docs/html/zh_CN/api/java/lang/SuppressWarnings.html
@SuppressWarnings("serial")
public?class?Hello?extends?UnicastRemoteObject?implements?IHello?{
????public?Hello()?throws?RemoteException?{
????????super();
????}
????
????public?void?rebind(String?name)?{?
????????try?{
????????????Naming.rebind(name,this);
????????????System.out.println("Server?is?running");
????????}?catch(Exception?e)?{
????????????e.printStackTrace();
????????}
????}
????public?String?sayHello(String?id)?throws?RemoteException?{
????????System.out.println("run?Server
.");
????????
????org.hibernate.Session?session?=?hbmConfig.HibernateSessionFactory.currentSession();
????org.hibernate.Query?qu?=?session.createQuery("from?Liu?lt?where?lt.id=:id");
????hibernate.Liu?ll?=?(hibernate.Liu)qu.setString("id",id).uniqueResult();
????hbmConfig.HibernateSessionFactory.closeSession();
????????return?"Hello?"+ll.getName()+"?This?is?processed?by?RMI";
????}
}
dos編譯->
E:\rmi_test\src>javac -cp .;D:\hbn\hibernate-3.2\hibernate-3.2.5.ga\hibernate-3.
2\hibernate3.jar? rmic/*.java
4>java注冊機開啟
E:\rmi_test\src>rmiregistry 1099
5> 本例簡單服務器開啟
package?start;
import?java.rmi.RMISecurityManager;
import?rmic.Hello?;
public?class?Start?{
????public?static?void?main(String[]?args)?{
????????try?{
????????????//System.setSecurityManager(new?RMISecurityManager());
????????????new?Hello().rebind("RMI/Mclaren");
????????}?catch(Exception?e)?{
????????????e.printStackTrace();
????????}
????}
}
dos編譯->E:\rmi_test\src>javac? start/*.java
運行->
java -classpath .;D:\hbn\hibernate-3.2\hibernate-3.2.5.ga\hibernate-3.2\lib\jta.jar;
D:\hbn\hibernate-3.2\hibernate-3.2.5.ga\hibernate-3.2\lib\asm.jar;
D:\hbn\hibernate-3.2\hibernate-3.2.5.ga\hibernate-3.2\lib\commons-collections-2.1.1.jar;
D:\hbn\hibernate-3.2\hibernate-3.2.5.ga\hibernate-3.2\lib\commons-logging-1.0.4.jar;
D:\hbn\hibernate-3.2\hibernate-3.2.5.ga\hibernate-3.2\hibernate3.jar;
D:\hbn\hibernate-3.2\hibernate-3.2.5.ga\hibernate-3.2\lib\dom4j-1.6.1.jar;
E:\lib\MYSQL.JAR;D:\hbn\hibernate-3.2\hibernate-3.2.5.ga\hibernate-3.2\lib\cglib-2.1.3.jar;
E:\and\ant\bin\antlr-2.7.5H3.jar
? start.Start
6>客戶端
?得到存根Hello_Stub.class-> E:\rmi_test\src>rmic rmic.Hello
?換個地方：c:\\TT 并copy rmic中的IHello.class和Hello_Stub.class連同目錄rmic一同copy
package?client;
import?java.rmi.Naming;
import?rmic.IHello;
public?final?class?Client?{
????public?static?void?main(String[]?args)?{
????????System.out.println("client.");
????????try?{
????????????IHello?hello?=?(IHello)Naming.lookup("rmi://localhost:1099/RMI/Mclaren");
????????????System.out.println(hello.sayHello("1"));
????????}?catch(Exception?e)?{
????????????e.printStackTrace();
????????}
????}
}
?dos編譯-> C:\TT>javac -d . Client.java
?C:\TT>java client.Client
?client....
?Hello gg This is processed by RMI (gg就是數據 成功！ )
mysql> select * from liu;
+----+------+-----+
| id | name | avg |
+----+------+-----+
|? 1 | gg?? |? 24 |
+----+------+-----+