activemq學習——發佈訂閱消息的傳遞（主題）

導航頁：https://blog.csdn.net/baokx/article/details/100745165

消費者代碼：

import org.apache.activemq.ActiveMQConnectionFactory;

import javax.jms.*;
import java.io.IOException;

/**
 * @author kexiang.bao
 * @create 2019-09-17 22:41
 */
public class JmsTopicConsumer {
    private static final String ACTIVE_URL = "tcp://192.168.207.128:61616";
    private static final String TOPIC_NAME = "topic_01";

    public static void main(String[] args) throws JMSException, IOException {
//        System.out.println("我是1號消費者");
//        System.out.println("我是2號消費者");
        System.out.println("我是3號消費者");
        //1.創建連接工廠,採用默認的用戶名和密碼
        ActiveMQConnectionFactory activeMQConnectionFactory = new ActiveMQConnectionFactory(ACTIVE_URL);
        //2.獲取連接並啓動訪問
        Connection connection = activeMQConnectionFactory.createConnection();
        connection.start();
        //3.創建session(參數：事務、簽收)
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        //4.創建目的地（具體是隊列還是主題）
        Topic topic = session.createTopic(TOPIC_NAME);
        //5.創建消費者
        MessageConsumer messageConsumer = session.createConsumer(topic);
        messageConsumer.setMessageListener((message) ->{
            if(null != message && message instanceof TextMessage){
                TextMessage textMessage = (TextMessage) message;
                try {
                    System.out.println("接收到topic消息："+textMessage.getText());
                } catch (JMSException e) {
                    e.printStackTrace();
                }
            }
        });
        System.in.read(); //防止還爲接收到消息的時候主進程就跑完
        messageConsumer.close();
        session.close();
        connection.close();
    }
}

注意：先啓動消費者，再啓動生產者，否則消息將成爲廢消息。

分別啓動三個消費者，運行結果：

控制檯顯示：

生產者代碼：

import org.apache.activemq.ActiveMQConnectionFactory;

import javax.jms.*;

/**
 * @author kexiang.bao
 * @create 2019-09-11 19:28
 */
public class JmsTopicProducer {
    private static final String ACTIVE_URL = "tcp://192.168.207.128:61616";
    private static final String TOPIC_NAME = "topic_01";

    public static void main(String[] args) throws JMSException {
        //1.創建連接工廠,採用默認的用戶名和密碼
        ActiveMQConnectionFactory activeMQConnectionFactory = new ActiveMQConnectionFactory(ACTIVE_URL);
        //2.獲取連接並啓動訪問
        Connection connection = activeMQConnectionFactory.createConnection();
        connection.start();
        //3.創建session(參數：事務、簽收)
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        //4.創建目的地（具體是隊列還是主題）
        Topic topic = session.createTopic(TOPIC_NAME);
        //5.創建消息的生產者
        MessageProducer messageProducer = session.createProducer(topic);
        //6.使用messageProducer發送消息至隊列
        for (int i = 1; i <= 3; i++) {
            //7.創建消息
            TextMessage textMessage = session.createTextMessage("topic-"+i);
            //8.發送消息
            messageProducer.send(textMessage);
        }
        //9.關閉資源
        messageProducer.close();
        session.close();
        connection.close();
        System.out.println("topic發佈成功");
    }
}

運行生產者：

控制檯顯示：