消息队列activeMQ之(Topic类型）的小demo(学习笔记之四)

1、建立pom项目添加pom依赖

<dependency>
  <groupId>org.apache.activemq</groupId>
  <artifactId>activemq-all</artifactId>
  <version>5.11.2</version>
</dependency>

2、创建man方法向MQ写入队列消息

package com.demo;
import org.apache.activemq.ActiveMQConnectionFactory;

import javax.jms.*;

/**
 * Created by luwan on 2018/4/14.
 */
public class App2 {
    public static void main(String[] args) throws JMSException {
        // 发送一个队列模式的消息
        ConnectionFactory connectionFactory = new ActiveMQConnectionFactory("tcp://192.168.223.131:61616");
        Connection connection = connectionFactory.createConnection();
        connection.start();

        // 创建会话
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

        // 消息对象
        Topic topic = session.createTopic("office-topic");

        // 消息内容
        TextMessage textMessage = session.createTextMessage("为中华民族伟大复兴而努力奋斗...");

        // 发送端
        MessageProducer producer = session.createProducer(topic);


        // 发送消息
        producer.send(textMessage);

        // 关闭连接
        producer.close();
        session.close();
        connection.close();
    }
}

3、查看MQ的消息

package ma。comsumer;

import org.apache.activemq.ActiveMQConnectionFactory;

import javax.jms.*;

/**
 * Created by luwan on 2018/4/14.
 */
public class App3 {
    public static void main(String[] args) throws Exception {
        xl();
    }

    public static void xl() throws Exception {
        // 创建连接
        ConnectionFactory connectionFactory = new ActiveMQConnectionFactory("tcp://192.168.223.131:61616");
        Connection connection = connectionFactory.createConnection();
        connection.setClientID("1");
        connection.start();

        // 创建 会话
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

        // 创建消息对象
        Topic topic = session.createTopic("office-topic");

        // 接收端
        MessageConsumer consumer = session.createDurableSubscriber(topic, "1");

        // 接收消息
        consumer.setMessageListener(new MessageListener() {// 消息监听器，监听mq服务器的变化
            @Override
            public void onMessage(Message message) {
                // 打印结果
                TextMessage textMessage = (TextMessage) message;
                String text = "";
                try {
                    text = textMessage.getText();
                } catch (JMSException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                System.err.println("读者，听到了" + text + ",背起了炸药包");
            }
        });
        // 等待接收消息
        System.in.read();
    }
}

package macomsumer;

import org.apache.activemq.ActiveMQConnectionFactory;

import javax.jms.*;

/**
 * Created by luwan on 2018/4/14.
 */
public class App3 {
    public static void main(String[] args) throws Exception {
        xl();
    }

    public static void xl() throws Exception {
        // 创建连接
        ConnectionFactory connectionFactory = new ActiveMQConnectionFactory("tcp://192.168.223.131:61616");
        Connection connection = connectionFactory.createConnection();
        connection.setClientID("1");
        connection.start();

        // 创建 会话
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);

        // 创建消息对象
        Topic topic = session.createTopic("office-topic");

        // 接收端
        MessageConsumer consumer = session.createDurableSubscriber(topic, "1");

        // 接收消息
        consumer.setMessageListener(new MessageListener() {// 消息监听器，监听mq服务器的变化
            @Override
            public void onMessage(Message message) {
                // 打印结果
                TextMessage textMessage = (TextMessage) message;
                String text = "";
                try {
                    text = textMessage.getText();
                } catch (JMSException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                System.err.println("雷锋，听到了" + text + ",复活了");
            }
        });
        // 等待接收消息
        System.in.read();
    }
}

备注：注意第二种读取，由于topic默认是不永久保存的，所以在producter中创建了一块空间，producter发送消息后，即便是服务没有开启也会在重启的时候读到producter的信息

4、另一个comsumer接受MQ消息

4.客户端表格的字段含义

                        挂起的消息                         在监听的人数             入队的消息              消费的消息

1 队列模式的消息，默认永久保存

2 订阅模式的消息，默认不永久保存，如果需要永久保存，需要为consumer在服务器上初始化一个永久保存的存储空间