JMS发送和接收实例-发布/订阅模式

发送消息

不管是将消息发送到队列还是发布到主题，编程的步骤是相同的，差别在于使用不同的JMS对象。具体定义见表：

发送消息的过程大体分为以下几步;

1、获得一个Weblogic Server上下文的引用；

2、创建连接工厂；

3、使用连接工厂创建一个连接；

4、使用连接创建一个会话；

5、获取一个目的；

6、使用会话和目的创建消息的生产者；

7、创建消息对象；

8、使用连接创建一个需要发送的消息类型的实例；

9、使用连接的一个队列发送器或主题公布器，然后使用发送器或公布器发送消息。

在敲代码之前要先导入需要的JAR包，并且配置JMS服务器。

 

注意：

wlfullclient.jar生成方式是,进入weblogic的安装目录例如C:\Oracle\Middleware\wlserver_10.3\server\lib，运行 java -jar wljarbuilder.jar就能生成wlfullclient.jar文件

JMS服务器配置请参考《学习在Weblogic服务器中配置消息服务器图解》

 

发送消息代码：

package com.xu.Pub2Sub;import java.util.Properties;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 MsgTopicProducer {/** * @功能：主题发送者 * @作者： * @日期：2012-10-18 */private TopicPublisher publisher;private TextMessage msg;public MsgTopicProducer(String[] args) throws NamingException, JMSException{/*初始化上下文对象*/String url = "t3://localhost:7001";Properties p = new Properties();p.put(Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory");p.put(Context.PROVIDER_URL, url);Context ctx = new InitialContext(p);/*创建一个连接工厂*/TopicConnectionFactory tConFactory = (TopicConnectionFactory)ctx.lookup("weblogic.jms.ConnectionFactory");/*创建一个主题*/Topic messageTopic = (Topic) ctx.lookup("jms/MyTopic");/*创建一个连接*/TopicConnection tCon = tConFactory.createTopicConnection();/*创建一个会话*/TopicSession session = tCon.createTopicSession(false, Session.AUTO_ACKNOWLEDGE);/*创建一个主题发布者，并发送消息*/publisher = session.createPublisher(messageTopic);msg = session.createTextMessage();}public void runClient() throws JMSException{msg.setText("Hello");publisher.publish(msg);msg.setText("Welcome to JMS!");publisher.publish(msg);System.out.println("成功！");}public static void main(String[] args) throws NamingException, JMSException {MsgTopicProducer mp = new MsgTopicProducer(args);mp.runClient();}}

同步接收者代码:

package com.xu.Pub2Sub;import java.util.Properties;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.TopicSession;import javax.jms.TopicSubscriber;import javax.naming.Context;import javax.naming.InitialContext;import javax.naming.NamingException;public class SyncMessageTopicReceiver {/** * @功能：发布-订阅消息服务   同步接收者 * @作者： * @日期：2012-10-18 */private TopicSubscriber subscriber ;private TextMessage msg;public SyncMessageTopicReceiver() throws NamingException, JMSException{/*初始化上下文对象*/String url = "t3://localhost:7001";Properties p = new Properties();p.put(Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory");p.put(Context.PROVIDER_URL, url);Context ctx = new InitialContext(p);/*创建主题连接工厂*/TopicConnectionFactory tConFactory = (TopicConnectionFactory) ctx.lookup("weblogic.jms.ConnectionFactory");/*创建一个主题*/Topic messageTopic = (Topic) ctx.lookup("jms/MyTopic");/*创建连接*/TopicConnection tCon = tConFactory.createTopicConnection();/*创建会话*/TopicSession session = tCon.createTopicSession(false, Session.AUTO_ACKNOWLEDGE);/*创建接收者*/subscriber = session.createSubscriber(messageTopic);tCon.start();}public void runClient() throws JMSException{msg = (TextMessage) subscriber.receive();System.out.println("Receiver:"+msg.getText());msg = (TextMessage) subscriber.receive();System.out.println("Receiver:"+msg.getText());}public static void main(String[] args) throws NamingException, JMSException {SyncMessageTopicReceiver receiver = new SyncMessageTopicReceiver();receiver.runClient();}}

异步接收者代码：

package com.xu.Pub2Sub;import java.util.Properties;import javax.jms.JMSException;import javax.jms.Message;import javax.jms.MessageListener;import javax.jms.Session;import javax.jms.TextMessage;import javax.jms.Topic;import javax.jms.TopicConnection;import javax.jms.TopicConnectionFactory;import javax.jms.TopicSession;import javax.jms.TopicSubscriber;import javax.naming.Context;import javax.naming.InitialContext;import javax.naming.NamingException;public class AsyncMessageTopicReceiver implements MessageListener {/** * @功能:发布-订阅消息服务 异步接收消息 * @作者： * @日期：2012-10-18 */private int EXPECTED_MESSAGE_COUNT = 10;private int messageCount = 0;private TopicSubscriber subscriber;public AsyncMessageTopicReceiver() throws NamingException, JMSException {/* 初始化上下文对象 */String url = "t3://localhost:7001";Properties p = new Properties();p.put(Context.INITIAL_CONTEXT_FACTORY,"weblogic.jndi.WLInitialContextFactory");p.put(Context.PROVIDER_URL, url);Context ctx = new InitialContext(p);/*创建主题连接工厂*/TopicConnectionFactory tConFactory = (TopicConnectionFactory) ctx.lookup("weblogic.jms.ConnectionFactory");/*创建一个主题*/Topic messageTopic = (Topic) ctx.lookup("jms/MyTopic");/*创建连接*/TopicConnection tCon = tConFactory.createTopicConnection();/*创建会话*/TopicSession session = tCon.createTopicSession(false, Session.AUTO_ACKNOWLEDGE);/*创建接收者*/subscriber = session.createSubscriber(messageTopic);/* 设置监听 */subscriber.setMessageListener(this);tCon.start();}public boolean expectMoreMessage() {return messageCount < EXPECTED_MESSAGE_COUNT;}@Overridepublic void onMessage(Message message) {System.out.println("onMessage");try {TextMessage msg = (TextMessage) message;System.out.println("Receiver:" + msg.getText());} catch (JMSException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}messageCount++;}public static void main(String[] args) throws NamingException, JMSException {int MAX_TRIES = 30;int tryCount = 0;AsyncMessageTopicReceiver receiver = new AsyncMessageTopicReceiver();while (receiver.expectMoreMessage() && (tryCount < MAX_TRIES)) {try {System.out.println(tryCount);Thread.sleep(1000);} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}tryCount++;}}}