Spring Boot异步消息之AMQP讲解及实战（附源码）-蒲公英云

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AMQP（高级消息队列协议）是一个提供统一消息服务的应用层标准高级消息队列协议。是应用层协议的一个开放标准，为面向消息的中间件设计。基于此协议的客户端与消息中间件可传递消息，并不受客户端/中间件的不同产品，不同开发语言等条件的限制。

下面实现主要用RabbitMQ讲解AMQP实例，因此需要事先安装RabbitMQ和erlang语言

erlang下载地址 https://www.erlang.org/downloads

RabbitMQ下载地址 https://www.rabbitmq.com/download.html

使用RabbitMQ实现发布/订阅异步消息模式

1：创建发布者应用ch8_2Sender

2：在pom.xml文件中添加依赖

<?xml version="1.0" encoding="UTF-8"?>
-<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0">
<modelVersion>4.0.0</modelVersion>
-<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.8.RELEASE</version>
<relativePath/>
<!-- lookup parent from repository -->
</parent>
<groupId>com.ch</groupId>
<artifactId>ch8_2Sender</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>ch8_2Sender</name>
<description>Demo project for Spring Boot</description>
+<properties>
-<dependencies>
-<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-amqp</artifactId>
</dependency>
+<dependency>
-<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
-<dependency>
<groupId>org.springframework.amqp</groupId>
<artifactId>spring-rabbit-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
-<build>
-<plugins>
-<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

3：创建Weather实体类

package com.ch.ch8_2Sender.entity;
import java.io.Serializable;
public class Weather implements Serializable{
    private static final long serialVersionUID = -8221467966772683998L;
    private String id;
    private String city;
    private String weatherDetail;
    public String getCity() {
        return city;
    }
    public void setCity(String city) {
        this.city = city;
    }
    public String getWeatherDetail() {
        return weatherDetail;
    }
    public void setWeatherDetail(String weatherDetail) {
        this.weatherDetail = weatherDetail;
    }
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    @Override
    public String toString() {
        return "Weather [id=" + id + ", city=" + city + ", weatherDetail=" + weatherDetail + "]";
    }
}

4：重写Ch82SenderApplication主类

package com.ch.ch8_2Sender;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessageBuilder;
import org.springframework.amqp.core.MessageDeliveryMode;
import org.springframework.amqp.rabbit.connection.CorrelationData;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.amqp.support.converter.Jackson2JsonMessageConverter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import com.ch.ch8_2Sender.entity.Weather;
import com.fasterxml.jackson.databind.ObjectMapper;
@SpringBootApplication
public class Ch82SenderApplication implements CommandLineRunner{ 
    @Autowired
    private ObjectMapper objectMapper;
    @Autowired 
    RabbitTemplate rabbitTemplate;
    public static void main(String[] args) {
        SpringApplication.run(Ch82SenderApplication.class, args);
    }
    /**
     * 定义发布者
     */
    @Override
    public void run(String... args) throws Exception {
        //定义消息对象
        Weather weather = new Weather();
        weather.setId("010");
        weather.setCity("北京");
        weather.setWeatherDetail("今天晴到多云，南风5-6级，温度19-26°C");
        //指定Json转换器，Jackson2JsonMessageConverter默认将消息转换成byte[]类型的消息
        rabbitTemplate.setMessageConverter(new Jackson2JsonMessageConverter());
        //objectMapper将weather对象转换为JSON字节数组
        Message msg=MessageBuilder.withBody(objectMapper.writeValueAsBytes(weather))
                .setDeliveryMode(MessageDeliveryMode.NON_PERSISTENT)
                .build();
        // 消息唯一ID
        CorrelationData correlationData = new CorrelationData(weather.getId());
        //使用已封装好的convertAndSend(String exchange , String routingKey , Object message, CorrelationData correlationData)
        //将特定的路由key发送消息到指定的交换机
        rabbitTemplate.convertAndSend(
                "weather-exchange", //分发消息的交换机名称
                "weather.message", //用来匹配消息的路由Key
                msg, //消息体
                correlationData);
    }
}

5：创建订阅者应用ch8_2Receiver-1

package com.ch.ch8_2Receiver1;
import org.springframework.amqp.rabbit.annotation.Exchange;
import org.springframework.amqp.rabbit.annotation.Queue;
import org.springframework.amqp.rabbit.annotation.QueueBinding;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.messaging.handler.annotation.Payload;
import org.springframework.stereotype.Component;
import com.fasterxml.jackson.databind.ObjectMapper;
/**
 * 定义订阅者Receiver1
 */
@Component
public class Receiver1 {
    @Autowired
    private ObjectMapper objectMapper;
    @RabbitListener(
            bindings = 
            @QueueBinding(
                //队列名weather-queue1保证和别的订阅者不一样
                value = @Queue(value = "weather-queue1",durable = "true"),
                //weather-exchange与发布者的交换机名相同
                exchange = @Exchange(value = "weather-exchange",durable = "true",type = "topic"),
                //weather.message与发布者的消息的路由Key相同
                key = "weather.message"
            )    
    )
    @RabbitHandler
    public void receiveWeather(@Payload byte[] weatherMessage)throws Exception{
        System.out.println("-----------订阅者Receiver1接收到消息--------");
        //将JSON字节数组转换为Weather对象
        Weather w=objectMapper.readValue(weatherMessage, Weather.class);
        System.out.println("Receiver1收到的消息内容："+w);
    }
}

6:创建订阅者应用ch8_2Receiver-2

package com.ch.ch8_2Receiver1;
import org.springframework.amqp.rabbit.annotation.Exchange;
import org.springframework.amqp.rabbit.annotation.Queue;
import org.springframework.amqp.rabbit.annotation.QueueBinding;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.messaging.handler.annotation.Payload;
import org.springframework.stereotype.Component;
import com.fasterxml.jackson.databind.ObjectMapper;
/**
 * 定义订阅者Receiver2
 */
@Component
public class Receiver2 {
    @Autowired
    private ObjectMapper objectMapper;
    @RabbitListener(
            bindings = 
            @QueueBinding(
                //队列名weather-queue2保证和别的订阅者不一样
                value = @Queue(value = "weather-queue2",durable = "true"),
                //weather-exchange与发布者的交换机名相同
                exchange = @Exchange(value = "weather-exchange",durable = "true",type = "topic"),
                //weather.message与发布者的消息的路由Key相同
                key = "weather.message"
            )    
    )
    @RabbitHandler
    public void receiveWeather(@Payload byte[] weatherMessage)throws Exception{
        System.out.println("-----------订阅者Receiver2接收到消息--------");
        Weather w=objectMapper.readValue(weatherMessage, Weather.class);
        //将JSON字节数组转换为Weather对象
        System.out.println("Receiver2收到的消息内容："+w);
    }
}