消息中间件JMS发布/订阅入门小Demo

消息中间件JMS发布/订阅入门小Demo

• 消息生产者

创建类TopicProducer

package jms.topic.demo;

import javax.jms.Connection;
import javax.jms.MessageProducer;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.jms.Topic;
import org.apache.activemq.ActiveMQConnectionFactory;

public class TopicProducer {

    public static void main(String[] args) throws Exception {
        //1.创建连接工厂
        ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory("tcp://192.168.52.128:61616");
        //2.获取连接
        Connection connection = connectionFactory.createConnection();
        //3.启动连接
        connection.start();
        //4.获取session
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        //5.创建主题对象
        Topic topic = session.createTopic("test-topic");
        //6.创建消息生产者
        MessageProducer producer = session.createProducer(topic);
        //7.创建消息
        TextMessage textMessage = session.createTextMessage("诚诚: 欢迎你");
        //8.发送消息
        producer.send(textMessage);
        //9.关闭资源
        producer.close();
        session.close();
        connection.close();
    }
}

运行效果

• 消息消费者

创建类TopicConsumer

package jms.topic.demo;

import javax.jms.Connection;
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 TopicConsumer {

    public static void main(String[] args) throws Exception {
        //1.创建连接工厂
        ActiveMQConnectionFactory connectionFactor = new ActiveMQConnectionFactory("tcp://192.168.52.128:61616");
        //2.获取连接
        Connection connection = connectionFactor.createConnection();
        //3.启动连接
        connection.start();
        //4.获取session
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        //5.创建主题对象
        Topic topic = session.createTopic("test-topic");
        //6.创建消费者
        MessageConsumer consumer = session.createConsumer(topic);
        //7.监听消息
        consumer.setMessageListener(new MessageListener() {

            public void onMessage(Message message) {
                TextMessage textMessage=(TextMessage) message;
                try {
                    System.out.println("接受消息: "+textMessage.getText());
                } catch (Exception e) {
                    e.printStackTrace();
                }       
            }
        });
        //8.等待键盘录入
        System.in.read();
        //9.关闭资源
        consumer.close();
        session.close();
        connection.close();
    }
}

• 运行测试
  同时开启2个以上的消费者，再次运行生产者，观察每个消费者控制台的输出，会发现每个消费者会接收到消息。

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