weblogic开发EJB

q36988

　　各个容器开发EJB不太一样，这里使用的是Weblogic8.1和EJB2.0进行演示的。
　　1 下载java1.4的EE包
　　2 设置环境变量
　　3 设置Weblogic的配置
　　4 添加weblogic的javaee.jar和weblogic.jar到CLASSPATH 在bea\weblogic81\server\lib中
　　下面的演示使用手工，不使用Eclipse
　　1 编写Bean
　　/*** */package com;import java.rmi.RemoteException;import javax.ejb.SessionBean;import javax.ejb.SessionContext;public class HelloWorldBean implements SessionBean {public void setSessionContext(SessionContext ctx) {System.out.println("set session context");}public void ejbCreate() {System.out.println("ejb create");}public void ejbRemove() {System.out.println("ejb remove");}public void ejbActivate() {System.out.println("ejb activate");}public void ejbPassivate() {System.out.println("ejb passivate");}public String sayHello(String name) throws RemoteException {return "Hello :" + name;}}
　　2 实现接口
　　/*** */package com;import java.rmi.RemoteException;   import javax.ejb.CreateException;   import javax.ejb.EJBHome;   public interface HelloWorldHome extends EJBHome   {   HelloWorldRemote create() throws RemoteException, CreateException;   }  
　　/*** */package com;import java.rmi.RemoteException;import javax.ejb.SessionBean;import javax.ejb.SessionContext;public class HelloWorldBean implements SessionBean {public void setSessionContext(SessionContext ctx) {System.out.println("set session context");}public void ejbCreate() {System.out.println("ejb create");}public void ejbRemove() {System.out.println("ejb remove");}public void ejbActivate() {System.out.println("ejb activate");}public void ejbPassivate() {System.out.println("ejb passivate");}public String sayHello(String name) throws RemoteException {return "Hello :" + name;}}
　　3 创建部署描述符ejb-jar.xml 在META-INF文件夹下
　　<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN"    "http://java.sun.com/dtd/ejb-jar_2_0.dtd">  <ejb-jar><display-name>TestEjb</display-name><enterprise-beans>  <session>  <display-name>helloEJB</display-name>  <ejb-name>helloEJB</ejb-name>  <home>com.HelloWorldHome</home>  <remote>com.HelloWorldRemote</remote>  <ejb-class>com.HelloWorldBean</ejb-class>  <session-type>Stateless</session-type>  <transaction-type>Bean</transaction-type>  </session>  </enterprise-beans>  </ejb-jar>
　　4 创建weblogic的部署weblogic-ejb-jar.xml
　　<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE weblogic-ejb-jar PUBLIC "-//BEA Systems, Inc.//DTD WebLogic 6.0.0 EJB//EN" "http://www.bea.com/servers/wls600/dtd/weblogic-ejb-jar.dtd"><weblogic-ejb-jar><description></description><weblogic-enterprise-bean><ejb-name>helloEJB</ejb-name><jndi-name>ejb/hello</jndi-name></weblogic-enterprise-bean></weblogic-ejb-jar>
　　5 编译上面的文件
　　javac
　　HelloWorldBean.class
　　HelloWorldRemote.class
　　HelloWorldHome.class
　　6 使用jar进行打包
　　jar -cvf TestEjb.jar *.*
　　7 使用weblogic的命令
　　java weblogic.appc TestEjb.jar
　　客户端访问可以去除HelloWorldBean.class
　　8 部署
　　8.1 启动weblogic服务，使用console进行部署。
　　8.2 或直接复制到应用程序目录，比如C:\bea\user_projects\domains\mydomain\applications也可以。
　　9 编写客户端
　　import java.util.Hashtable;import javax.naming.Context;import javax.naming.InitialContext;import javax.rmi.PortableRemoteObject;import com.HelloWorldHome;import com.HelloWorldRemote;/** Created on 2010-11-12** To change the template for this generated file go to* Window>Preferences>Java>Code Generation>Code and Comments*//*** @author Administrator** To change the template for this generated type comment go to* Window>Preferences>Java>Code Generation>Code and Comments*/public class TestEjb {public static void main(String[] args) {try {System.out.println("begin ctx");//得到与远程通信的连接Hashtable cs = new Hashtable();cs.put(Context.INITIAL_CONTEXT_FACTORY,"weblogic.jndi.WLInitialContextFactory");cs.put(Context.PROVIDER_URL, "t3://rollin:7001");Context ctx = new InitialContext(cs);System.out.println("----------------------");HelloWorldHome objRef = (HelloWorldHome) ctx.lookup("ejb/hello");HelloWorldHome home =(HelloWorldHome) PortableRemoteObject.narrow(objRef,HelloWorldHome.class);HelloWorldRemote remote = home.create();System.out.println(remote.sayHello("mrl"));} catch (Exception ex) {ex.printStackTrace();System.out.println(ex.toString());}}}
　　10 javac Test.java
　　11 java Test
　　C:\Documents and Settings\Administrator\workspace\TestEjb\ejbModule>java TestEjbbegin ctx----------------------Hello :mrl
　　<2010-11-12 下午14时54分11秒 CST> <Notice> <WebLogicServer> <BEA-000355> <Thread"ListenThread.Default" listening on port 7001, ip address *.*>set session contextejb create
　　12 在容器内访问：该web的lib有EJBClient.jar(TestEjb.jar)文件即可。
　　<%@ page language="java" contentType="text/html; charset=utf-8"pageEncoding="utf-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>Insert title here</title></head><body><%@ page import="java.sql.*"%> <%@ page import="java.util.*"%> <%@ page import="javax.naming.*"%> <%@ page import="javax.rmi.PortableRemoteObject"%> <%@ page import="com.HelloWorldHome"%> <%@ page import="com.HelloWorldRemote"%> <%String result = "";try {System.out.println("begin context");//得到与远程通信的连接Hashtable cs = new Hashtable();cs.put(Context.INITIAL_CONTEXT_FACTORY,"weblogic.jndi.WLInitialContextFactory");cs.put(Context.PROVIDER_URL, "t3://rollin:7001");Context ctx = new InitialContext(cs);System.out.println("----------------------");HelloWorldHome objRef = (HelloWorldHome) ctx.lookup("ejb/hello");HelloWorldHome home =(HelloWorldHome) PortableRemoteObject.narrow(objRef,HelloWorldHome.class);HelloWorldRemote remote = home.create();result = remote.sayHello("mrl2");} catch (Exception ex) {ex.printStackTrace();System.out.println(ex.toString());} finally {out.println("end");}%><%=result%></body></html>
　　访问该页面2次的情况
　　end Hello :mrl2
　　end Hello :mrl2
　　begin context----------------------begin context----------------------
　　容器内其实容器可以发现EJB对象
　　<%@ page language="java" contentType="text/html; charset=utf-8"pageEncoding="utf-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>Insert title here</title></head><body><%@ page import="java.sql.*"%> <%@ page import="java.util.*"%> <%@ page import="javax.naming.*"%> <%@ page import="javax.rmi.PortableRemoteObject"%> <%@ page import="com.HelloWorldHome"%> <%@ page import="com.HelloWorldRemote"%> <%String result = "";try {System.out.println("begin context ag");//得到与远程通信的连接Context ctx = new InitialContext();System.out.println("----------------------");HelloWorldHome objRef = (HelloWorldHome) ctx.lookup("ejb/hello");HelloWorldHome home =(HelloWorldHome) PortableRemoteObject.narrow(objRef,HelloWorldHome.class);HelloWorldRemote remote = home.create();result = remote.sayHello("mrl3");} catch (Exception ex) {ex.printStackTrace();System.out.println(ex.toString());} finally {out.println("end");}%><%=result%></body></html>
　　后台
　　begin context----------------------set session contextejb createbegin context ag----------------------