JMS TOPIC 代码备份

在使用JMS 发送消息到 目的地(TOPIC) 时，JMS 服务器使用weblogic 9.2 首先，做几步基础性的工作。

首先：要放一个weblogic.xml 文件到WEB-INF 下。然后修改web.xml 的dtd验正。weblogic 9.2 需要servlet 2.4的版本。

<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.4"
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

消息的发送机代码：

package com.jms.topic.test;

import java.util.Properties;

import javax.jms.DeliveryMode;
import javax.jms.JMSException;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.jms.Topic;
import javax.jms.TopicConnection;
import javax.jms.TopicConnectionFactory;
import javax.jms.TopicPublisher;
import javax.jms.TopicSession;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;



public class JmsSenderTopicTest {
	private static TopicConnection tConnection=null; 
	public static void main(String[] args) {
		try {
			Properties p = new Properties();
			p.put("Context.INITIAL_CONTEXT_FACTORY","weblogic.jndi.WLInitialContextFactory");
			p.put(Context.PROVIDER_URL,"t3://localhost:7003");;
			p.put(Context.SECURITY_PRINCIPAL,"weblogic");
			p.put(Context.SECURITY_CREDENTIALS,"weblogic");
			Context ctx = new InitialContext(p);
			/**测试JNDI 是否联连成功 是否可以把属性挂在JNDI 树上 开始*/
			ctx.bind("name","zs");
			Object ojbObject = ctx.lookup("name");
			System.out.println(ojbObject.toString());
			/**测试JNDI 是否联连成功 是否可以把属性挂在JNDI 树上 结束*/
			TopicConnectionFactory connectionFactory =  (TopicConnectionFactory) ctx.lookup("testcf");//ConnectionFactory-0
			tConnection  = connectionFactory.createTopicConnection();
			TopicSession tSession = tConnection.createTopicSession(false,Session.AUTO_ACKNOWLEDGE);
			Topic topic = (Topic) ctx.lookup("testTopic");
			// 消息发送者
			TopicPublisher tPublisher = null;
			// 会话
			//根据队列建立消息发送者
			tPublisher = tSession.createPublisher(topic);
			/***发送text 文本信息 开始**/
			//建立消息
	    	TextMessage tTextMessage=	tSession.createTextMessage();
			tSession.createTextMessage();
			//开始连接
			tConnection.start();
			//开始发送消息 发送模式：DeliveryMode.NON_PERSISTENT
			tPublisher.setDeliveryMode(DeliveryMode.PERSISTENT);
			tTextMessage.setText(" 再发一次。go go go ..哈佛爱情故事");
			
			tPublisher.send(tTextMessage);
			System.out.println("发送完毕");
		} catch (NamingException e) {
			e.printStackTrace();
		} catch (JMSException e) {
			e.printStackTrace();
		}finally{
			if(tConnection!=null){
				try {
					tConnection.stop();
					tConnection.close();
					tConnection=null;
				} catch (JMSException e) {
					e.printStackTrace();
				}
			}
		}
	}

}

消息的接收机代码：

package com.jms.topic.test;

import java.util.Properties;

import javax.jms.MessageConsumer;
import javax.jms.Session;
import javax.jms.Topic;
import javax.jms.TopicConnection;
import javax.jms.TopicConnectionFactory;
import javax.jms.TopicSession;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;


public class JmsReceiveTopicTest2 extends HttpServlet{
	 
	private static final long serialVersionUID = -5395350304473151061L;
 
	@Override
	public void init() throws ServletException {
	
		Properties p = new Properties();
		p.put("Context.INITIAL_CONTEXT_FACTORY","weblogic.jndi.WLInitialContextFactory");
		p.put(Context.PROVIDER_URL,"t3://localhost:7003");;
		p.put(Context.SECURITY_PRINCIPAL,"weblogic");
		p.put(Context.SECURITY_CREDENTIALS,"weblogic");
	
		try {
			Context ctx= new InitialContext(p);
			/**测试JNDI 是否联连成功 是否可以把属性挂在JNDI 树上 开始*/
			ctx.bind("name","zs");
			Object ojbObject = ctx.lookup("name");
			System.out.println(ojbObject.toString());
			/**测试JNDI 是否联连成功 是否可以把属性挂在JNDI 树上 结束*/
			TopicConnectionFactory connectionFactory =  (TopicConnectionFactory) ctx.lookup("testcf");
			TopicConnection tConnection = connectionFactory.createTopicConnection();
			TopicSession tSession = tConnection.createTopicSession(true,Session.AUTO_ACKNOWLEDGE);
			Topic  topic = (Topic) ctx.lookup("testTopic");
		    MessageConsumer comsumer = tSession.createSubscriber(topic);
		    comsumer.setMessageListener(new JMSListener());
		    tConnection.start();
		    System.out.println("接收开始2");
		} catch (Exception e) {
			e.printStackTrace();
		}
		super.init();
	}
	 
}

package com.jms.topic.test;

import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.ObjectMessage;
import javax.jms.TextMessage;

public class JMSListener implements MessageListener {
	String ident = null;
	public JMSListener(){}
	public JMSListener(String ident){
	this.ident = ident;
	}
 
	public void onMessage(Message msg){
		try {//--根据不同的消息类型接收消息
		    if (msg instanceof TextMessage) {
		       if (ident == null)
		    	   System.out.println(((TextMessage) msg).getText());
		      else
		    	  System.out.println(ident + ": " + ((TextMessage) msg).getText());
		     }
		  else if (msg instanceof ObjectMessage) {
			   if (ident == null)
			          System.out.println(((ObjectMessage) msg).getObject());
			    else
			          System.out.println(ident + ": " + ((ObjectMessage) msg).getObject());
		      }
		    }catch (JMSException jE) {
		     System.err.println("Exception in listener: " + jE);
		    }
		  }
	}

把servlet 添加到web.xml 文件中。启动项目。当然，那些所需要的必备参数，要建在weblogic的 jms模块中。

	<servlet>
	 <servlet-name>jmsListener</servlet-name>
	 <servlet-class>com.jms.topic.test.JmsReceiveTopicTest2</servlet-class>
	 <load-on-startup>1</load-on-startup>
	</servlet>

这样就可以发送消息的时候，消息接收机就会自动的接收消息。

注：消费接收机不能关闭connection 连接。需要一直保持与服务器的连接状态。