topic 简介

前提

1.先启动消费者 然后再启动生成者，只有订阅了，才能接收到订阅的消息

生成者

package com.ttzz.activemq;

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;

public class ActiveMQProduceByTopic {
    
    
	public static String url = "tcp://localhost:61616";
	public static String topicName = "myTopic";
	
	public static void main(String[] args) throws JMSException {
    
    
		//1.获取工厂
		ActiveMQConnectionFactory activeMQConnectionFactory = new ActiveMQConnectionFactory(url);
		//2. 创建连接
		Connection connection = activeMQConnectionFactory.createConnection();
		
		//3.创建会话
		// 第一个参数 是否开启开启事务
		// 第二个参数 是签收模式
		Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
		//4. 创建目的地 Topic 
		Topic topic =session.createTopic(topicName);
		//5. 创建生产者
		MessageProducer messageProducer = session.createProducer(topic);
		
		messageProducer.setDeliveryMode(DeliveryMode.PERSISTENT);
		connection.start();
		//6. 发送消息
		for (int i = 0; i < 4; i++) {
    
    
			TextMessage textMessage = session.createTextMessage("myTopic……"+ i );
			textMessage.setStringProperty("自定义消息的key", "自定义消息的value");
			messageProducer.send(textMessage);
		}
		//关闭资源
		messageProducer.close();
		session.close();
		connection.close();
		System.out.println("OOKK");
	}
}

消费者

package com.ttzz.activemq;

import java.io.IOException;

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

import org.apache.activemq.ActiveMQConnectionFactory;

public class ActiveMQConsumerByTopic {
    
    
	public static String url = "tcp://localhost:61616";
	public static String topicName = "myTopic";

	public static void main(String[] args) throws JMSException, IOException {
    
    
		// 1.获取工厂
		ActiveMQConnectionFactory activeMQConnectionFactory = new ActiveMQConnectionFactory(url);
		// 2. 创建连接
		Connection connection = activeMQConnectionFactory.createConnection();
		
		connection.setClientID("消费者2");
		System.out.println("消费者2");
		
		// 3.创建会话
		// 第一个参数 是否开启开启事务
		// 第二个参数 是签收模式
		Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
		// 4. 创建目的地Topic
		Topic topic = session.createTopic(topicName);
		// 5. 创建消费者
		TopicSubscriber topicSubscriber = session.createDurableSubscriber(topic, "remark..."); // 创建持久化的订阅

		connection.start();

		Message message = topicSubscriber.receive();
		while (message != null) {
    
    
			TextMessage textMessage = (TextMessage) message;
			System.out.println(textMessage.getText());
			message = topicSubscriber.receive();
		}

		session.close();
		connection.close();
		System.out.println("OOKK2");
	}
}

先启动两个消费者，然后再启动生产者

消费者控制台
消费者1

消费者2

MQ界面