深入掌握JMS（五）：实战Topic

本文转自：http://blog.csdn.net/iamfafa/article/details/6264698

与Queue不同的是，Topic实现的是发布/订阅模型，在下面的例子中，启动2个消费者共同监听一个Topic，然后循环给这个Topic中发送多个消息。

import javax.jms.Connection; 
import javax.jms.JMSException; 
import javax.jms.Message; 
import javax.jms.MessageConsumer; 
import javax.jms.MessageListener; 
import javax.jms.MessageProducer; 
import javax.jms.Session; 
import javax.jms.TextMessage; 
import javax.jms.Topic; 

import org.apache.activemq.ActiveMQConnectionFactory; 
import org.apache.activemq.command.ActiveMQTopic; 

public class TopicTest { 

    public static void main(String[] args) throws Exception { 
        ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory("vm://localhost"); 
        Connection connection = factory.createConnection(); 
        connection.start(); 
        //创建一个Topic 
        Topic topic= new ActiveMQTopic("testTopic"); 
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE); 
        //注册消费者1 
        MessageConsumer comsumer1 = session.createConsumer(topic); 
        comsumer1.setMessageListener(new MessageListener(){ 
            public void onMessage(Message m) { 
                try { 
                    System.out.println("Consumer1 get " + ((TextMessage)m).getText()); 
                } catch (JMSException e) { 
                    e.printStackTrace(); 
                } 
            } 
        }); 
        //注册消费者2 
        MessageConsumer comsumer2 = session.createConsumer(topic); 
        comsumer2.setMessageListener(new MessageListener(){ 
            public void onMessage(Message m) { 
                try { 
                    System.out.println("Consumer2 get " + ((TextMessage)m).getText()); 
                } catch (JMSException e) { 
                    e.printStackTrace(); 
                } 
            } 
        }); 
        //创建一个生产者，然后发送多个消息。 
        MessageProducer producer = session.createProducer(topic); 
        for(int i=0; i<10; i++){ 
            producer.send(session.createTextMessage("Message:" + i)); 
        } 
    } 

} 

运行后得到下面的输出结果：



Consumer1 get Message:0
Consumer2 get Message:0
Consumer1 get Message:1
Consumer2 get Message:1
Consumer1 get Message:2
Consumer2 get Message:2
Consumer1 get Message:3
Consumer2 get Message:3
Consumer1 get Message:4
Consumer2 get Message:4
Consumer1 get Message:5
Consumer2 get Message:5
Consumer1 get Message:6
Consumer2 get Message:6
Consumer1 get Message:7
Consumer2 get Message:7
Consumer1 get Message:8
Consumer2 get Message:8
Consumer1 get Message:9
Consumer2 get Message:9



说明每一个消息都会被所有的消费者消费。