EJB2.0有状态SessionBean

环境： 
JBoss 4.0.2 
JDK1.5 
IDEA8.1.4

 

一、EJB开发

 

package lavasoft.testejb20yzt; 

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 2010-3-31 15:26:53 
*/ 
public class HelloStatefulBean implements SessionBean { 
        private SessionContext context; 
        private String someOne; 

        /** 
         * 业务方法 
         * 
         * @return Hello的消息 
         */ 
        public String sayHello() { 
                System.out.println("HelloStatefulBean: 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 
         * 这只能是一个有状态的bean,因为无状态的bean除了无参数的create方法外，不能有其他的创建方法 
         */ 
        public void ejbCreate(String someOne) { 
                System.out.println("HelloStatefulBean: ejbCreate(String someOne) is called!"); 
                this.someOne = someOne; 
        } 

        //-------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("HelloStatefulBean: ejbActivate() is called!"); 
        } 

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

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

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

 

package lavasoft.testejb20yzt; 

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 2010-3-31 15:31:10 
*/ 
public interface HelloStateful extends EJBObject { 
        /** 
         * 业务方法，组件接口中的业务方法必须抛出RemoteException 
         * 
         * @return 
         * @throws java.rmi.RemoteException 
         */ 
        public String sayHello() throws RemoteException; 
}

 

 

package lavasoft.testejb20yzt; 

import javax.ejb.CreateException; 
import javax.ejb.EJBHome; 
import java.rmi.RemoteException; 

/** 
* Home接口 
* Home接口必须扩展EJBHome或者EJBLocalHome接口 
* 客户使用Home接口来请求组件接口的一个引用 
* 可以将Home接口看做是一个工厂，它能制造Bean的引用个，而且能向客户分配bean引用 
* 
* @author leizhimin 2010-3-31 15:32:06 
*/ 
public interface HelloStatefulHome extends EJBHome { 
        public HelloStateful create(String someOne) throws CreateException, 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 Stateful EJB</display-name> 
        <enterprise-beans> 
                <session> 
                        <display-name>helloStatefulEJB</display-name> 
                        <ejb-name>helloStatefulEJB</ejb-name> 
                        <home>lavasoft.testejb20yzt.HelloStatefulHome</home> 
                        <remote>lavasoft.testejb20yzt.HelloStateful</remote> 
                        <ejb-class>lavasoft.testejb20yzt.HelloStatefulBean</ejb-class> 
                        <session-type>Stateful</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>helloStatefulEJB</ejb-name> 
                        <jndi-name>ejb/helloStatefulEJB</jndi-name> 
                </session> 
        </enterprise-beans> 
</jboss>

 

 

二、客户端开发

 

package lavasoft.client; 

import lavasoft.testejb20yzt.HelloStateful; 
import lavasoft.testejb20yzt.HelloStatefulHome; 

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 2010-3-31 15:54:20 
*/ 
public class TestStatefulSessionBeanClient { 
        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/helloStatefulEJB"); 
                //强制转换为所需类型的对象 
                HelloStatefulHome home = (HelloStatefulHome) PortableRemoteObject.narrow(objref, HelloStatefulHome.class); 
                //通过home对象创建一个组件接口对象 
                HelloStateful hello = home.create("StatefulEJB"); 
                //通过组件接口对象调用业务方法 
                String msg = hello.sayHello(); 
                System.out.println(msg); 
        } 
}

 

客户端调用结果：

 

jboss控制台输出：

 

 

在此，没有使用本地接口，本地接口规则如下：

本文转自 leizhimin 51CTO博客，原文链接：http://blog.51cto.com/lavasoft/290058，如需转载请自行联系原作者