activemq学习——消息可靠性之持久性

导航页：https://blog.youkuaiyun.com/baokx/article/details/100745165

在非持久化模式下，生产者发送的消息在消费者接收到之前若mq宕机，则消费者无法再接收到消息。

在持久化模式下，生产者发送的消息在消费者接收到之前若mq宕机，在mq启动后消费者可以接收到消息，默认为此种模式。

持久topic之生产者

import org.apache.activemq.ActiveMQConnectionFactory;

import javax.jms.*;

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

    public static void main(String[] args) throws JMSException {
        //1.创建连接工厂,采用默认的用户名和密码
        ActiveMQConnectionFactory activeMQConnectionFactory = new ActiveMQConnectionFactory(ACTIVE_URL);
        //2.获取连接并启动访问
        Connection connection = activeMQConnectionFactory.createConnection();

        //3.创建session(参数：事务、签收)
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        //4.创建目的地（具体是队列还是主题）
        Topic topic = session.createTopic(TOPIC_NAME);
        //5.创建消息的生产者
        MessageProducer messageProducer = session.createProducer(topic);

        //持久化属性
        messageProducer.setDeliveryMode(DeliveryMode.PERSISTENT);
        //start下移
        connection.start();

        //6.使用messageProducer发送消息至队列
        for (int i = 1; i <= 3; i++) {
            //7.创建消息
            TextMessage textMessage = session.createTextMessage("persist-topic-"+i);
            System.out.println(textMessage.getText());
            //8.发送消息
            messageProducer.send(textMessage);
        }
        //9.关闭资源
        messageProducer.close();
        session.close();
        connection.close();
        System.out.println("持久化的topic发布成功");
    }
}

持久topic之消费者

import org.apache.activemq.ActiveMQConnectionFactory;

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

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

    public static void main(String[] args) throws JMSException, IOException {
        System.out.println("我是持久topicClient1..");
        //1.创建连接工厂,采用默认的用户名和密码
        ActiveMQConnectionFactory activeMQConnectionFactory = new ActiveMQConnectionFactory(ACTIVE_URL);
        //2.获取连接并启动访问
        Connection connection = activeMQConnectionFactory.createConnection();
        connection.setClientID("c1");

        //3.创建session(参数：事务、签收)
        Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
        //4.创建目的地（具体是队列还是主题）
        Topic topic = session.createTopic(TOPIC_NAME);
        TopicSubscriber topicSubscriber = session.createDurableSubscriber(topic,"remark");
        connection.start();
        Message message = topicSubscriber.receive();
        while(null != message){
            TextMessage textMessage = (TextMessage) message;
            System.out.println("接收到持久化的topic:"+textMessage.getText());
            message = topicSubscriber.receive(5000L);
        }

        session.close();
        connection.close();
    }
}

先运行一次消费者，类似于注册

此时若运行生产者肯定可以接收到消息，不再做演示。将消费者停止运行：

然后运行生产者：

此时再次启动消费者：