activemq 简单例子

ProducerTool.java用于发送消息：

package com.google.homework;

 import javax.jms.Connection;   
 import javax.jms.DeliveryMode;   
 import javax.jms.Destination;   
 import javax.jms.JMSException;   
 import javax.jms.MessageProducer;   
 import javax.jms.Session;   
 import javax.jms.TextMessage;   
   
 import org.apache.activemq.ActiveMQConnection;   
 import org.apache.activemq.ActiveMQConnectionFactory;   
   
 public class ProducerTool {   
   
     private String user = ActiveMQConnection.DEFAULT_USER;   
   
     private String password = ActiveMQConnection.DEFAULT_PASSWORD;   
   
     private String url = ActiveMQConnection.DEFAULT_BROKER_URL;   
   
     private String subject = "TOOL.DEFAULT";   
   
     private Destination destination = null;   
   
     private Connection connection = null;   
   
     private Session session = null;   
   
     private MessageProducer producer = null;   
   
     // 初始化   
     private void initialize() throws JMSException, Exception {   
         ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(   
                 user, password, url);   
         connection = connectionFactory.createConnection();   
         session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);   
         destination = session.createQueue(subject);   
         producer = session.createProducer(destination);   
         producer.setDeliveryMode(DeliveryMode.NON_PERSISTENT);   
     }   
   
     // 发送消息   
     public void produceMessage(String message) throws JMSException, Exception {   
         initialize();   
         TextMessage msg = session.createTextMessage(message);   
         connection.start();   
         System.out.println("Producer:->Sending message: " + message);   
         producer.send(msg);   
         System.out.println("Producer:->Message sent complete!");   
     }   
   
     // 关闭连接   
     public void close() throws JMSException {   
         System.out.println("Producer:->Closing connection");   
         if (producer != null)   
             producer.close();   
         if (session != null)   
             session.close();   
         if (connection != null)   
             connection.close();   
     }   
 }    

 

ConsumerTool.java用于接受消息，我用的是基于消息监听的机制，需要实现MessageListener接口，这个接口有个onMessage方法，当接受到消息的时候会自动调用这个函数对消息进行处理。

package com.google.homework;

 import javax.jms.Connection;   
 import javax.jms.Destination;   
 import javax.jms.JMSException;   
 import javax.jms.MessageConsumer;   
 import javax.jms.Session;   
 import javax.jms.MessageListener;   
 import javax.jms.Message;   
 import javax.jms.TextMessage;   
   
 import org.apache.activemq.ActiveMQConnection;   
 import org.apache.activemq.ActiveMQConnectionFactory;   
   
 public class ConsumerTool implements MessageListener {   
   
     private String user = ActiveMQConnection.DEFAULT_USER;   
   
     private String password = ActiveMQConnection.DEFAULT_PASSWORD;   
   
     private String url = ActiveMQConnection.DEFAULT_BROKER_URL;   
   
     private String subject = "TOOL.DEFAULT";   
   
     private Destination destination = null;   
   
     private Connection connection = null;   
   
     private Session session = null;   
   
     private MessageConsumer consumer = null;   
   
     // 初始化   
     private void initialize() throws JMSException, Exception {   
         ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory(   
                 user, password, url);   
         connection = connectionFactory.createConnection();   
         session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);   
         destination = session.createQueue(subject);   
         consumer = session.createConsumer(destination);   
            
     }   
   
     // 消费消息   
     public void consumeMessage() throws JMSException, Exception {   
         initialize();   
         connection.start();   
            
         System.out.println("Consumer:->Begin listening...");   
         // 开始监听   
         consumer.setMessageListener(this);   
         // Message message = consumer.receive();   
     }   
   
     // 关闭连接   
     public void close() throws JMSException {   
         System.out.println("Consumer:->Closing connection");   
         if (consumer != null)   
             consumer.close();   
         if (session != null)   
             session.close();   
         if (connection != null)   
             connection.close();   
     }   
   
     // 消息处理函数   
     public void onMessage(Message message) {   
         try {   
             if (message instanceof TextMessage) {   
                 TextMessage txtMsg = (TextMessage) message;   
                 String msg = txtMsg.getText();   
                 System.out.println("Consumer:->Received: " + msg);   
             } else {   
                 System.out.println("Consumer:->Received: " + message);   
             }   
         } catch (JMSException e) {   
             // TODO Auto-generated catch block   
             e.printStackTrace();   
         }   
     }   
 }    

 

如果想主动的去接受消息，而不用消息监听的话，把consumer.setMessageListener(this)改为Message message = consumer.receive()，手动去调用MessageConsumer的receive方法即可。

下面是测试类Test.java：

package com.google.homework;

 import javax.jms.JMSException;   
   
 public class Test {   
   
     /**  
      * @param args  
      */  
     public static void main(String[] args) throws JMSException, Exception {   
         // TODO Auto-generated method stub   
         ConsumerTool consumer = new ConsumerTool();   
         ProducerTool producer = new ProducerTool();   
         // 开始监听   
         consumer.consumeMessage();   
            
         // 延时500毫秒之后发送消息   
         Thread.sleep(500);   
         producer.produceMessage("Hello, world!");   
         producer.close();   
            
         // 延时500毫秒之后停止接受消息   
         Thread.sleep(500);   
         consumer.close();   
     }   
 }    

 

评论

1 楼 wjing63 2010-12-20  

很好的例子