SpringBoot 2.x （13）：整合ActiveMQ

ActiveMQ5.x不多做介绍了，主要是SpringBoot的整合

特点：
1）支持来自Java，C，C ++，C＃，Ruby，Perl，Python，PHP的各种跨语言客户端和协议
2）支持许多高级功能，如消息组，虚拟目标，通配符和复合目标
3) 完全支持JMS 1.1和J2EE 1.4，支持瞬态，持久，事务和XA消息
4) Spring支持，ActiveMQ可以轻松嵌入到Spring应用程序中，并使用Spring的XML配置机制进行配置
5) 支持在流行的J2EE服务器（如TomEE，Geronimo，JBoss，GlassFish和WebLogic）中进行测试
6) 使用JDBC和高性能日志支持非常快速的持久化

下载：

http://activemq.apache.org/activemq-5153-release.html

实际开发推荐部署到Linux系统，具体操作网上也有教程

我这里为了方便，直接安装在本地Windows机器上

如果想了解更多，查看官方文档：

http://activemq.apache.org/getting-started.html

进入bin目录win64目录启动activemq.bat即可

访问localhost:8161进入首页

访问http://localhost:8161/admin/进入管理页面，默认用户名和密码都是admin

整合：

依赖

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-activemq</artifactId>
        </dependency>

连接池

        <dependency>
            <groupId>org.apache.activemq</groupId>
            <artifactId>activemq-pool</artifactId>
        </dependency>

基本的配置

# ActiveMQ
spring.activemq.broker-url=tcp://127.0.0.1:61616
spring.activemq.user=admin
spring.activemq.password=admin
spring.activemq.pool.enabled=true
spring.activemq.pool.max-connections=100

使用ActiveMQ必须要在SpringBoot启动类中开启JMS，并进行配置

package org.dreamtech.avtivemq;

import javax.jms.ConnectionFactory;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.core.env.Environment;
import org.springframework.jms.annotation.EnableJms;
import org.springframework.jms.core.JmsMessagingTemplate;
import org.springframework.jms.core.JmsTemplate;

@SpringBootApplication
@EnableJms
public class AvtivemqApplication {

    public static void main(String[] args) {
        SpringApplication.run(AvtivemqApplication.class, args);
    }

    @Autowired
    private Environment env;

    @Bean
    public ConnectionFactory connectionFactory() {
        ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory();
        connectionFactory.setBrokerURL(env.getProperty("spring.activemq.broker-url"));
        connectionFactory.setUserName(env.getProperty("spring.activemq.user"));
        connectionFactory.setPassword(env.getProperty("spring.activemq.password"));
        return connectionFactory;
    }

    @Bean
    public JmsTemplate genJmsTemplate() {
        return new JmsTemplate(connectionFactory());

    }

    @Bean
    public JmsMessagingTemplate jmsMessageTemplate() {
        return new JmsMessagingTemplate(connectionFactory());
    }
}

点对点模型：

首先实现消息的发送

package org.dreamtech.avtivemq.service;

import javax.jms.Destination;

/**
 * 消息生产
 * 
 * @author Xu Yiqing
 *
 */
public interface ProducerService {
    /**
     * 使用指定消息队列发送
     * 
     * @param destination
     * @param message
     */
    void sendMsg(Destination destination, final String message);
}

package org.dreamtech.avtivemq.service.impl;

import javax.jms.Destination;

import org.dreamtech.avtivemq.service.ProducerService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jms.core.JmsMessagingTemplate;
import org.springframework.stereotype.Service;

@Service
public class ProducerServiceImpl implements ProducerService {
    @Autowired
    private JmsMessagingTemplate jmsTemplate;

    @Override
    public void sendMsg(Destination destination, String message) {
        jmsTemplate.convertAndSend(destination, message);
    }

}

package org.dreamtech.avtivemq.controller;

import javax.jms.Destination;

import org.apache.activemq.command.ActiveMQQueue;
import org.dreamtech.avtivemq.service.ProducerService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class OrderController {
    @Autowired
    private ProducerService producerService;
    
    @GetMapping("/order")
    private Object order(String msg) {
        Destination destination = new ActiveMQQueue("order.queue");
        producerService.sendMsg(destination,msg);
        return "order";
    }
}

访问：http://localhost:8080/order?msg=demo，然后查看ActiveMQ界面：

有生产者就就有消费者：监听消息队列

package org.dreamtech.avtivemq.jms;

import org.springframework.jms.annotation.JmsListener;
import org.springframework.stereotype.Component;

@Component
public class OrderConsumer {
    /**
     * 监听指定消息队列
     * 
     * @param text
     */
    @JmsListener(destination = "order.queue")
    public void receiveQueue(String text) {
        System.out.println("[ OrderConsumer收到的报文 : " + text + " ]");
    }
}

由于实时监听，一启动SpringBoot就会打印：

[ OrderConsumer收到的报文 : demo ]

发布订阅模型：比如抖音小视频，某网红发布新视频，多名粉丝收到消息

默认ActiveMQ只支持点对点模型，想要开启发布订阅模型，需要进行配置

spring.jms.pub-sub-domain=true

Spring管理主题对象

    @Bean
    public Topic topic() {
        return new ActiveMQTopic("demo.topic");
    }

发布者

    /**
     * 消息发布者
     * 
     * @param msg
     */
    void publish(String msg);

    @Autowired
    private JmsMessagingTemplate jmsTemplate;
    @Autowired
    private Topic topic;

    @Override
    public void publish(String msg) {
        jmsTemplate.convertAndSend(topic, msg);
    }

    @Autowired
    private ProducerService producerService;
    @GetMapping("/topic")
    private Object topic(String msg) {
        producerService.publish(msg);
        return "success";
    }

订阅者（消费者）：一人发布，多人订阅

package org.dreamtech.avtivemq.jms;

import org.springframework.jms.annotation.JmsListener;
import org.springframework.stereotype.Component;

@Component
public class TopicConsumer {
    @JmsListener(destination = "demo.topic")
    public void receiver1(String text) {
        System.out.println("TopicConsumer : receiver1 : " + text);
    }

    @JmsListener(destination = "demo.topic")
    public void receiver2(String text) {
        System.out.println("TopicConsumer : receiver2 : " + text);
    }

    @JmsListener(destination = "demo.topic")
    public void receiver3(String text) {
        System.out.println("TopicConsumer : receiver3 : " + text);
    }
}

启动项目，访问：

http://localhost:8080/topic?msg=666

打印如下

TopicConsumer : receiver1 : 666
TopicConsumer : receiver3 : 666
TopicConsumer : receiver2 : 666

那么点对点和发布订阅模型可以一起使用吗？

不可以

如何配置？

1.注释掉 #spring.jms.pub-sub-domain=true

2.加入Bean：给topic定义独立的JmsListenerContainer

    @Bean
    public JmsListenerContainerFactory<?> jmsListenerContainerTopic(ConnectionFactory activeMQConnectionFactory) {
        DefaultJmsListenerContainerFactory bean = new DefaultJmsListenerContainerFactory();
        bean.setPubSubDomain(true);
        bean.setConnectionFactory(activeMQConnectionFactory);
        return bean;
    }

3.@JmsListener如果不指定独立的containerFactory的话是只能消费queue消息

    @JmsListener(destination = "demo.topic", containerFactory = "jmsListenerContainerTopic")
    public void receiver1(String text) {
        System.out.println("TopicConsumer : receiver1 : " + text);
    }