ActiveMQ学习笔记备忘一发布/订阅模型

最新推荐文章于 2022-04-14 14:53:50 发布

原创最新推荐文章于 2022-04-14 14:53:50 发布 · 552 阅读

0 ·

CC 4.0 BY-SA版权

JMS 同时被 2 个专栏收录

3 篇文章

订阅专栏

1 篇文章

订阅专栏

本文介绍了一种基于ActiveMQ的消息中间件实现的发布订阅模型。通过具体的代码示例展示了如何创建发布者发送消息到主题，以及如何设置订阅者接收这些消息。发布者使用NON_PERSISTENT传递模式提高效率，并通过无限循环不断发送带有时间戳的消息。

记录下自己学习activeMQ发布订阅模型的过程：

发布者Pub：

package com.mq.pubSub;

import javax.jms.Connection;
import javax.jms.DeliveryMode;
import javax.jms.JMSException;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.jms.Topic;

import org.apache.activemq.ActiveMQConnectionFactory;

import com.mq.constant.Create_Type;
import com.mq.p2p.ConnUtils;

public class Pub {

	// MessageProducer：消息发送者  
	   private static MessageProducer Pubproducer;
	   
	   public void pubSendMessage() throws JMSException, InterruptedException{
	        

		   ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory("tcp://localhost:61616");  
	        Connection connection = factory.createConnection();  
	        connection.start();  
	          
	        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);  
	        Topic topic = session.createTopic("topic");  
	  
	         Pubproducer = session.createProducer(topic);  
	         Pubproducer.setDeliveryMode(DeliveryMode.NON_PERSISTENT); 
		   
		   while(true){
			  TextMessage message = session.createTextMessage();
	           message.setText("Hello Topic_MQ "+System.currentTimeMillis());
	           // 发送消息到目的地方  
	           System.out.println("Hello Topic_MQ "+System.currentTimeMillis());  
	           Pubproducer.send(message);  
	           Thread.sleep(5000);
	       }  
	   }
	public static void main(String[] args) throws JMSException, InterruptedException {
		new Pub().pubSendMessage();
	}
}

订阅者订阅主题（Sub）：

package com.mq.pubSub;

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

import org.apache.activemq.ActiveMQConnectionFactory;

public class Sub {
	
	 
	 public void TopicReceive() throws Exception{
	    	
		 	ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory("tcp://localhost:61616");  
	        Connection connection = factory.createConnection();  
	        connection.start();  
	          
	        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);  
	        Topic topic = session.createTopic("topic");  
	  
	        MessageConsumer consumer = session.createConsumer(topic);  
	        consumer.setMessageListener(new MessageListener() {  
    	            public void onMessage(Message message) {  
    	                TextMessage tm = (TextMessage) message;  
    	                try {  
    	                    System.out.println("Received message: " + tm.getText());  
    	                } catch (JMSException e) {  
    	                    e.printStackTrace();  
    	                }  
    	            }  
    	        });  
	}
	 
	 public static void main(String[] args) throws Exception {
		new Sub().TopicReceive();
	}
}