釋出訂閱模式與前面的點對點模式很類似，簡直一毛一樣

注意：釋出訂閱模式 先啟動消費者

公用pom：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.toov5</groupId>
  <artifactId>springboot-topic-producer</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.1.RELEASE</version>
    </parent>
    <!-- 管理依賴 -->
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.M7</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
    <dependencies>
        <!-- SpringBoot整合Web元件 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- SpringBoot Activemq -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-activemq</artifactId>
        </dependency>
    </dependencies>
    <!-- 注意： 這裡必須要新增， 否者各種依賴有問題 -->
    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/libs-milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>
</project>

　與上一篇部落格類似的：改改就歐克了 猜猜都知道該怎麼玩

　yml：

spring:
  activemq:
    broker-url: tcp://192.168.91.6:61616
    user: admin
    password: admin
my_topic: springboot-topic-toov5
server:
  port: 8081

　　config

package com.toov5.config;

import javax.jms.Topic;

import org.apache.activemq.command.ActiveMQTopic;
 
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;

@Component
public class ConfigQueue {
   @Value("${my_topic}")
   private String myTopic;
    
    //首先將佇列注入到SpringBoot容器中去
    @Bean
    public
 
 Topic queue() {
        return new ActiveMQTopic(myTopic);
    } 
    
}

producer

package com.toov5.topicProducer;

import javax.jms.Topic;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jms.core.JmsMessagingTemplate;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

@Component
public class TopicProducer {
    @Autowired
    private JmsMessagingTemplate jmsMessagingTemplate;
    //把佇列注入進來 
    @Autowired  //此註解預設是以型別找  在配置檔案中 已經注入的  @Bean 
    private Topic topic;
    
    //每隔5s時間向佇列傳送訊息
    @Scheduled(fixedDelay=5000)  //每間隔2s向佇列傳送訊息
    public void send() {
        String msgString = System.currentTimeMillis()+" ";
        jmsMessagingTemplate.convertAndSend(topic,msgString);
        System.out.println("釋出訂閱通訊，msg"+msgString);
    }
}

建立producer maven

SpringBoot 預設開啟點對點的！！！！ 訂閱模式需要手動！！！！！

yml中： 

#### 開啟發布訂閱
jms:
pub-sub-domain: true

yml：

spring:
  activemq:
    broker-url: tcp://192.168.91.6:61616
    user: admin
    password: admin
my_queue: springboot-queue-toov5
server:
  port: 8080　　

 consumer

package com.toov5.activemqConsumer;

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

@Component
public class P2PConsumer {
   
    @JmsListener(destination= "${my_queue}")    //用這個註解去監聽 監聽的佇列
    public void receiver(String msg) {
        System.out.println("消費者成功獲取到生產者的訊息，msg"+msg);
    }
    
    
}

啟動類

package com.toov5.activemqConsumer;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class AppConsumer {

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

 先啟動消費者 然後啟動生產者，多開幾個埠玩玩叢集~