EJB2.0版本的HelloWorld

package lavasoft.testejb20; 

import javax.ejb.SessionBean; 
import javax.ejb.SessionContext; 

/** 
* Bean类 
* 所有具体的业务逻辑都在此类里面，此类不抛出远程异常 
* 
* @author leizhimin 2010-3-30 9:06:57 
*/ 
public  class HelloBean  implements SessionBean { 
         /** 
         * 业务方法 
         * 
         * @param someOne 
         * @return Hello的消息 
         */ 
         public String  sayHello(String someOne) { 
                System.out.println( "HelloBean: sayHello() is called!"); 
                 return  "Hello, " + someOne +  "!"; 
        } 

         /** 
         * 必须有这个方法，这是EJB的一条原则，这个方法不是来自SessionBean接口的 
         */ 
         public  void ejbCreate() { 
                System.out.println( "HelloBean: ejbCreate() is called!"); 
        } 

         //-------下面四个方法是来自SessionBean的，必须写出来，但没啥用------- 
         public  void ejbActivate() { 
                System.out.println( "HelloBean: ejbActivate() is called!"); 
        } 

         public  void ejbPassivate() { 
                System.out.println( "HelloBean: ejbPassivate() is called!"); 
        } 

         public  void ejbRemove() { 
                System.out.println( "HelloBean: ejbRemove() is called!"); 
        } 

         public  void setSessionContext(SessionContext sessionContext) { 
                System.out.println( "HelloBean: setSessionContext() is called!"); 
        } 
}

package lavasoft.testejb20; 

import javax.ejb.EJBObject; 
import java.rmi.RemoteException; 

/** 
* 组件接口 
* 所有的业务方法都要在此接口中声明 
* 
* @author leizhimin 2010-3-30 9:10:32 
*/ 
public  interface Hello  extends EJBObject { 
         /** 
         * 业务方法，组件接口中的业务方法必须抛出RemoteException 
         * 
         * @param someOne 
         * @return 
         * @throws RemoteException 
         */ 
         public String sayHello(String someOne)  throws RemoteException; 
}

<? 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 >Hello EJB </ display-name > 
         < enterprise-beans > 
                 < session > 
                         < display-name >helloEJB </ display-name > 
                         < ejb-name >helloEJB </ ejb-name > 
                         < home >lavasoft.testejb20.HelloHome </ home > 
                         < remote >lavasoft.testejb20.Hello </ remote > 
                         < ejb-class >lavasoft.testejb20.HelloBean </ ejb-class > 
                         < session-type >Stateless </ session-type > 
                         < transaction-type >Bean </ transaction-type > 
                         < security-identity > 
                                 < description > </ description > 
                                 < use-caller-identity > </ use-caller-identity > 
                         </ security-identity > 
                 </ session > 
         </ enterprise-beans > 
</ ejb-jar >

<? xml  version ="1.0"  encoding ="UTF-8" ?> 
< jboss > 
         < enterprise-beans > 
                 < session > 
                         < ejb-name >helloEJB </ ejb-name > 
                         < jndi-name >ejb/helloEJB </ jndi-name > 
                 </ session > 
         </ enterprise-beans > 
</ jboss >

C:\test\testejb20\out\exploded\testejb20EJB>jar -cvf ../helloejb.jar . 
标明清单(manifest) 
增加：lavasoft/(读入= 0) (写出= 0)(存储了 0%) 
增加：lavasoft/testejb20/(读入= 0) (写出= 0)(存储了 0%) 
增加：lavasoft/testejb20/Hello. class(读入= 250) (写出= 183)(压缩了 26%) 
增加：lavasoft/testejb20/HelloBean. class(读入= 1455) (写出= 670)(压缩了 53%) 
增加：lavasoft/testejb20/HelloHome. class(读入= 277) (写出= 200)(压缩了 27%) 
增加：lavasoft/client/(读入= 0) (写出= 0)(存储了 0%) 
增加：lavasoft/client/TestClient. class(读入= 1367) (写出= 701)(压缩了 48%) 
忽略项 META-INF/ 
增加：META-INF/ejb-jar.xml(读入= 882) (写出= 365)(压缩了 58%) 
增加：META-INF/jboss.xml(读入= 237) (写出= 130)(压缩了 45%)

package lavasoft.client; 

import lavasoft.testejb20.Hello; 
import lavasoft.testejb20.HelloHome; 

import javax.ejb.CreateException; 
import javax.naming.InitialContext; 
import javax.naming.NamingException; 
import javax.rmi.PortableRemoteObject; 
import java.rmi.RemoteException; 
import java.util.Properties; 

/** 
* 客户端代码 
* 客户端会依赖组件接口和Home接口 
* 
* @author leizhimin 2010-3-30 10:22:50 
*/ 
public  class TestClient { 
         public  static  void main(String[] args)  throws NamingException, CreateException, RemoteException { 
                Properties props =  new Properties(); 
                props.setProperty( "java.naming.factory.initial",  "org.jnp.interfaces.NamingContextFactory"); 
                props.setProperty( "java.naming.provider.url",  "localhost:1099"); 
                 //初始化JNDI上下文环境,因为客户端不知道JBOSS的环境 
                InitialContext ctx =  new InitialContext(props); 
                 //检索指定的对象 
                Object objref = ctx.lookup( "ejb/helloEJB"); 
                 //强制转换为所需类型的对象 
                HelloHome home = (HelloHome) PortableRemoteObject.narrow(objref, HelloHome. class); 
                 //通过home对象创建一个组件接口对象 
                Hello hello = home.create(); 
                 //通过组件接口对象调用业务方法 
                String msg = hello.sayHello( "ejb"); 
                System.out.println(msg); 
        } 
}