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-0tConnection  = 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_PERSISTENTtPublisher.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; @Overridepublic 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。