ActiveMQ发布-订阅消息模式实现

1. 发布-订阅消息模式实现

JMSProducer.java

package com.andrew.subscribe;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
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;

/**
 * 消息生产者-消息发布者
 */
public class JMSProducer {

    private static final String USERNAME = ActiveMQConnection.DEFAULT_USER; // 默认的连接用户名
    private static final String PASSWORD = ActiveMQConnection.DEFAULT_PASSWORD; // 默认的连接密码
    private static final String BROKEURL = ActiveMQConnection.DEFAULT_BROKER_URL; // 默认的连接地址
    private static final int SENDNUM = 3; // 发送的消息数量

    public static void main(String[] args) {
        ConnectionFactory connectionFactory; // 连接工厂
        Connection connection = null; // 连接
        Session session; // 会话 接受或者发送消息的线程
        Destination destination; // 消息的目的地
        MessageProducer messageProducer; // 消息生产者
        // 实例化连接工厂
        connectionFactory = new ActiveMQConnectionFactory(JMSProducer.USERNAME, JMSProducer.PASSWORD, JMSProducer.BROKEURL);
        try {
            connection = connectionFactory.createConnection(); // 通过连接工厂获取连接
            connection.start(); // 启动连接
            session = connection.createSession(Boolean.TRUE, Session.AUTO_ACKNOWLEDGE); // 创建Session
            destination = session.createTopic("FirstTopic1");
            messageProducer = session.createProducer(destination); // 创建消息生产者
            sendMessage(session, messageProducer); // 发送消息
            session.commit();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (connection != null) {
                try {
                    connection.close();
                } catch (JMSException e) {
                    e.printStackTrace();
                }
            }
        }
    }

    /**
     * 发送消息
     */
    public static void sendMessage(Session session, MessageProducer messageProducer) throws Exception {
        for (int i = 0; i < JMSProducer.SENDNUM; i++) {
            TextMessage message = session.createTextMessage("ActiveMQ 发送的消息" + i);
            System.out.println("发送消息：" + "ActiveMQ 发布的消息" + i);
            messageProducer.send(message);
        }
    }
}

Listener.java

package com.andrew.subscribe;

import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.TextMessage;

/**
 * 消息监听-订阅者一
 */
public class Listener implements MessageListener {

    @Override
    public void onMessage(Message message) {
        try {
            System.out.println("订阅者一收到的消息：" + ((TextMessage) message).getText());
        } catch (JMSException e) {
            e.printStackTrace();
        }
    }
}

Listener2.java

package com.andrew.subscribe;

import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.TextMessage;

/**
 * 消息监听-订阅者二
 */
public class Listener2 implements MessageListener {

    @Override
    public void onMessage(Message message) {
        try {
            System.out.println("订阅者二收到的消息：" + ((TextMessage) message).getText());
        } catch (JMSException e) {
            e.printStackTrace();
        }
    }
}

JMSConsumer.java

package com.andrew.subscribe;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.MessageConsumer;
import javax.jms.Session;

import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.ActiveMQConnectionFactory;

/**
 * 消息消费者-消息订阅者一
 */
public class JMSConsumer {

    private static final String USERNAME = ActiveMQConnection.DEFAULT_USER; // 默认的连接用户名
    private static final String PASSWORD = ActiveMQConnection.DEFAULT_PASSWORD; // 默认的连接密码
    private static final String BROKEURL = ActiveMQConnection.DEFAULT_BROKER_URL; // 默认的连接地址

    public static void main(String[] args) {
        ConnectionFactory connectionFactory; // 连接工厂
        Connection connection = null; // 连接
        Session session; // 会话 接受或者发送消息的线程
        Destination destination; // 消息的目的地
        MessageConsumer messageConsumer; // 消息的消费者
        // 实例化连接工厂
        connectionFactory = new ActiveMQConnectionFactory(JMSConsumer.USERNAME, JMSConsumer.PASSWORD, JMSConsumer.BROKEURL);
        try {
            connection = connectionFactory.createConnection(); // 通过连接工厂获取连接
            connection.start(); // 启动连接
            session = connection.createSession(Boolean.FALSE, Session.AUTO_ACKNOWLEDGE); // 创建Session
            destination = session.createTopic("FirstTopic1");
            messageConsumer = session.createConsumer(destination); // 创建消息消费者
            messageConsumer.setMessageListener(new Listener()); // 注册消息监听
        } catch (JMSException e) {
            e.printStackTrace();
        }
    }
}

JMSConsumer2.java

package com.andrew.subscribe;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.MessageConsumer;
import javax.jms.Session;

import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.ActiveMQConnectionFactory;

/**
 * 消息消费者-消息订阅者二
 */
public class JMSConsumer2 {
    private static final String USERNAME = ActiveMQConnection.DEFAULT_USER; // 默认的连接用户名
    private static final String PASSWORD = ActiveMQConnection.DEFAULT_PASSWORD; // 默认的连接密码
    private static final String BROKEURL = ActiveMQConnection.DEFAULT_BROKER_URL; // 默认的连接地址
    public static void main(String[] args) {
        ConnectionFactory connectionFactory; // 连接工厂
        Connection connection = null; // 连接
        Session session; // 会话 接受或者发送消息的线程
        Destination destination; // 消息的目的地
        MessageConsumer messageConsumer; // 消息的消费者
        // 实例化连接工厂
        connectionFactory = new ActiveMQConnectionFactory(JMSConsumer2.USERNAME, JMSConsumer2.PASSWORD, JMSConsumer2.BROKEURL);
        try {
            connection = connectionFactory.createConnection(); // 通过连接工厂获取连接
            connection.start(); // 启动连接
            session = connection.createSession(Boolean.FALSE, Session.AUTO_ACKNOWLEDGE); // 创建Session
            destination = session.createTopic("FirstTopic1");
            messageConsumer = session.createConsumer(destination); // 创建消息消费者
            messageConsumer.setMessageListener(new Listener2()); // 注册消息监听
        } catch (JMSException e) {
            e.printStackTrace();
        }
    }
}

运行JMSConsumer.java

运行JMSConsumer2.java

运行JMSProducer.java
发送消息：ActiveMQ 发布的消息0
发送消息：ActiveMQ 发布的消息1
发送消息：ActiveMQ 发布的消息2

订阅者一收到的消息：ActiveMQ 发送的消息0
订阅者一收到的消息：ActiveMQ 发送的消息1
订阅者一收到的消息：ActiveMQ 发送的消息2

订阅者二收到的消息：ActiveMQ 发送的消息0
订阅者二收到的消息：ActiveMQ 发送的消息1
订阅者二收到的消息：ActiveMQ 发送的消息2