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SpringBoot之ActiveMQ实现延迟消息

一、安装activeMQ

安装步骤参照网上教程，本文不做介绍

二、修改activeMQ配置文件

broker新增配置信息 schedulerSupport="true"

<broker xmlns="http://activemq.apache.org/schema/core" brokerName="localhost" dataDirectory="${activemq.data}" schedulerSupport="true" >

        <destinationPolicy>
            <policyMap>
              <policyEntries>
                <policyEntry topic=">" >
                    <!-- The constantPendingMessageLimitStrategy is used to prevent
                         slow topic consumers to block producers and affect other consumers
                         by limiting the number of messages that are retained
                         For more information, see:

                         http://activemq.apache.org/slow-consumer-handling.html

                    -->
                  <pendingMessageLimitStrategy>
                    <constantPendingMessageLimitStrategy limit="1000"/>
                  </pendingMessageLimitStrategy>
                </policyEntry>
              </policyEntries>
            </policyMap>
        </destinationPolicy>

三、创建SpringBoot工程

SpringBoot之ActiveMQ实现延迟消息 ]()

配置ActiveMQ工厂信息，信任包必须配置否则会报错

package com.example.demoactivemq.config;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.RedeliveryPolicy;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.ArrayList;
import java.util.List;

/**
 * @author shanks on 2019-11-12
 */
@Configuration
public class ActiveMqConfig {

    @Bean
    public ActiveMQConnectionFactory factory(@Value("${spring.activemq.broker-url}") String url){
        ActiveMQConnectionFactory factory = new ActiveMQConnectionFactory(url);
        // 设置信任序列化包集合
        List<String> models = new ArrayList<>();
        models.add("com.example.demoactivemq.domain");
        factory.setTrustedPackages(models);

        return factory;
    }

}

消息实体类

package com.example.demoactivemq.domain;

import lombok.Builder;
import lombok.Data;

import java.io.Serializable;

/**
 * @author shanks on 2019-11-12
 */

@Builder
@Data
public class MessageModel implements Serializable {
    private String titile;
    private String message;
}

生产者

package com.example.demoactivemq.producer;


import lombok.extern.slf4j.Slf4j;
import org.apache.activemq.ScheduledMessage;
import org.apache.activemq.command.ActiveMQQueue;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.jms.JmsProperties;
import org.springframework.jms.core.JmsMessagingTemplate;
import org.springframework.stereotype.Service;

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


/**
 * 消息生产者
 *
 * @author shanks
 */
@Service
@Slf4j
public class Producer {

    public static final Destination DEFAULT_QUEUE = new ActiveMQQueue("delay.queue");

    @Autowired
    private JmsMessagingTemplate template;

    /**
     * 发送消息
     *
     * @param destination destination是发送到的队列
     * @param message     message是待发送的消息
     */
    public <T extends Serializable> void send(Destination destination, T message) {
        template.convertAndSend(destination, message);
    }

    /**
     * 延时发送
     *
     * @param destination 发送的队列
     * @param data        发送的消息
     * @param time        延迟时间
     */
    public <T extends Serializable> void delaySend(Destination destination, T data, Long time) {
        Connection connection = null;
        Session session = null;
        MessageProducer producer = null;
        // 获取连接工厂
        ConnectionFactory connectionFactory = template.getConnectionFactory();
        try {
            // 获取连接
            connection = connectionFactory.createConnection();
            connection.start();
            // 获取session，true开启事务，false关闭事务
            session = connection.createSession(Boolean.TRUE, Session.AUTO_ACKNOWLEDGE);
            // 创建一个消息队列
            producer = session.createProducer(destination);
            producer.setDeliveryMode(JmsProperties.DeliveryMode.PERSISTENT.getValue());
            ObjectMessage message = session.createObjectMessage(data);
            //设置延迟时间
            message.setLongProperty(ScheduledMessage.AMQ_SCHEDULED_DELAY, time);
            // 发送消息
            producer.send(message);
            log.info("发送消息：{}", data);
            session.commit();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (producer != null) {
                    producer.close();
                }
                if (session != null) {
                    session.close();
                }
                if (connection != null) {
                    connection.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

消费者

package com.example.demoactivemq.producer;


import com.example.demoactivemq.domain.MessageModel;
import lombok.extern.slf4j.Slf4j;
import org.springframework.jms.annotation.JmsListener;
import org.springframework.stereotype.Component;

/**
 * 消费者
 */
@Component
@Slf4j
public class Consumer {


    @JmsListener(destination = "delay.queue")
    public void receiveQueue(MessageModel message) {
        log.info("收到消息:{}", message);
    }
}

application.yml

spring:
  activemq:
    broker-url: tcp://localhost:61616

测试类

package com.example.demoactivemq;

import com.example.demoactivemq.domain.MessageModel;
import com.example.demoactivemq.producer.Producer;
import org.junit.jupiter.api.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@SpringBootTest(classes = DemoActivemqApplication.class)
@RunWith(SpringRunner.class)
class DemoActivemqApplicationTests {

    /**
     * 消息生产者
     */
    @Autowired
    private Producer producer;

    /**
     * 及时消息队列测试
     */
    @Test
    public void test() {
        MessageModel messageModel = MessageModel.builder()
                .message("测试消息")
                .titile("消息000")
                .build();
        // 发送消息
        producer.send(Producer.DEFAULT_QUEUE, messageModel);
    }

    /**
     * 延时消息队列测试
     */
    @Test
    public void test2() {
        for (int i = 0; i < 5; i++) {
            MessageModel messageModel = MessageModel.builder()
                    .titile("延迟10秒执行")
                    .message("测试消息" + i)
                    .build();
            // 发送延迟消息
            producer.delaySend(Producer.DEFAULT_QUEUE, messageModel, 10000L);
        }
        try {
            // 休眠100秒，等等消息执行
            Thread.currentThread().sleep(100000L);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }

}

执行结果

2019-11-12 22:18:52.939  INFO 17263 --- [           main] c.e.demoactivemq.producer.Producer       : 发送消息：MessageModel(titile=延迟10秒执行, message=测试消息0)
2019-11-12 22:18:52.953  INFO 17263 --- [           main] c.e.demoactivemq.producer.Producer       : 发送消息：MessageModel(titile=延迟10秒执行, message=测试消息1)
2019-11-12 22:18:52.958  INFO 17263 --- [           main] c.e.demoactivemq.producer.Producer       : 发送消息：MessageModel(titile=延迟10秒执行, message=测试消息2)
2019-11-12 22:18:52.964  INFO 17263 --- [           main] c.e.demoactivemq.producer.Producer       : 发送消息：MessageModel(titile=延迟10秒执行, message=测试消息3)
2019-11-12 22:18:52.970  INFO 17263 --- [           main] c.e.demoactivemq.producer.Producer       : 发送消息：MessageModel(titile=延迟10秒执行, message=测试消息4)
2019-11-12 22:19:03.012  INFO 17263 --- [enerContainer-1] c.e.demoactivemq.producer.Consumer       : 收到消息:MessageModel(titile=延迟10秒执行, message=测试消息0)
2019-11-12 22:19:03.017  INFO 17263 --- [enerContainer-1] c.e.demoactivemq.producer.Consumer       : 收到消息:MessageModel(titile=延迟10秒执行, message=测试消息1)
2019-11-12 22:19:03.019  INFO 17263 --- [enerContainer-1] c.e.demoactivemq.producer.Consumer       : 收到消息:MessageModel(titile=延迟10秒执行, message=测试消息2)
2019-11-12 22:19:03.020  INFO 17263 --- [enerContainer-1] c.e.demoactivemq.producer.Consumer       : 收到消息:MessageModel(titile=延迟10秒执行, message=测试消息3)
2019-11-12 22:19:03.021  INFO 17263 --- [enerContainer-1] c.e.demoactivemq.producer.Consumer       : 收到消息:MessageModel(titile=延迟10秒执行, message=测试消息4)

比你优秀的人比你还努力，你有什么资格不去奋斗!!!

原文 https://segmentfault.com/a/1190000020983270

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