一、简介

扇型（广播）交换机，这个交换机没有路由键概念，就算你绑了路由键也是无视的。这个交换机在接收到消息后，会直接转发到绑定到它上面的所有队列。

广播交换机是不需要RoutingKey的；

二、代码展示

父pom文件

<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.1</version>
<!--        <version>2.2.5.RELEASE</version>-->
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.chensir</groupId>
    <artifactId>spring-boot-rabbitmq</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>spring-boot-rabbitmq</name>

    <properties>
        <java.version>8</java.version>
        <hutool.version>5.8.3</hutool.version>
        <lombok.version>1.18.24</lombok.version>
    </properties>

    <description>spring-boot-rabbitmq</description>

    <packaging>pom</packaging>

    <modules>
        <module>direct-exchange</module>
        <module>fanout-exchange</module>
        <module>topic-exchange</module>
        <module>game-exchange</module>
        <module>dead-letter-queue</module>
        <module>delay-queue</module>
        <module>delay-queue2</module>
    </modules>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>cn.hutool</groupId>
                <artifactId>hutool-all</artifactId>
                <version>${hutool.version}</version>
            </dependency>

            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>${lombok.version}</version>
            </dependency>
        </dependencies>
    </dependencyManagement>


</project>

pom文件

<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>com.chensir</groupId>
        <artifactId>spring-boot-rabbitmq</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <relativePath>../pom.xml</relativePath>
    </parent>

    <artifactId>fanout-exchange</artifactId>


    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-amqp</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </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>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

配置文件

server.port=8082

#host
spring.rabbitmq.host=121.40.100.52
#默认5672
spring.rabbitmq.port=5672
#用户名
spring.rabbitmq.username=guest
#密码
spring.rabbitmq.password=guest
#连接到代理时用的虚拟主机
spring.rabbitmq.virtual-host=/
#每个消费者每次可最大处理的nack消息数量 默认250个
spring.rabbitmq.listener.simple.prefetch=1
#表示消息确认方式，其有三种配置方式，分别是none、manual(手动)和auto(自动)；默认auto
spring.rabbitmq.listener.simple.acknowledge-mode=auto
#监听重试是否可用
spring.rabbitmq.listener.simple.retry.enabled=true
#最大重试次数
#spring.rabbitmq.listener.simple.retry.max-attempts=5
#最大重试时间间隔
spring.rabbitmq.listener.simple.retry.max-interval=20000ms
#第一次和第二次尝试传递消息的时间间隔
spring.rabbitmq.listener.simple.retry.initial-interval=3000ms
#应用于上一重试间隔的乘数
spring.rabbitmq.listener.simple.retry.multiplier=2
#决定被拒绝的消息是否重新入队；默认是true（与参数acknowledge-mode有关系）
spring.rabbitmq.listener.simple.default-requeue-rejected=false

config

package com.chensir.config;

import org.springframework.amqp.core.*;
import org.springframework.amqp.support.converter.Jackson2JsonMessageConverter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.security.Key;

@Configuration
public class RabbitConfig {

    //解决对象类型乱码
    @Bean
    public Jackson2JsonMessageConverter messageConverter(){
        return new Jackson2JsonMessageConverter();
    }

    /**
     * 广播交换机(扇形交换机)
     * @return
     */
    @Bean
    public FanoutExchange fanoutExchange(){
//        DirectExchange directExchange=new DirectExchange("DirectExchange-01",true,false);
        FanoutExchange fanoutExchange = new FanoutExchange("FanoutExchange-01", true, false);
        return fanoutExchange;
    }

    /**
     * 队列a
     * @return
     */
    @Bean
    public Queue fanoutQueueA(){
        Queue queue = QueueBuilder.durable("FanoutQueue-01").build();
        return queue;
    }

    /**
     * 队列b
     * @return
     */
    @Bean
    public Queue fanoutQueueB(){
//        Queue queue=QueueBuilder.durable("DirectQueue-01").build();
        Queue queue = QueueBuilder.durable("FanoutQueue-02").build();
        return queue;
    }

    /**
     * 绑定
     * @return
     */
    @Bean
    public Binding bindingA() {
//        Binding binding=BindingBuilder.bind(directQueue()).to(directExchange).with("key-01");
        Binding binding = BindingBuilder.bind(fanoutQueueA()).to(fanoutExchange());
        return binding;
    }

    @Bean
    public Binding bindingB() {
//        Binding binding=BindingBuilder.bind(directQueue()).to(directExchange).with("key-01");
        Binding binding = BindingBuilder.bind(fanoutQueueB()).to(fanoutExchange());
        return binding;
    }

}

生产者

@Component
public class FanoutProvider {
    @Resource
    private RabbitTemplate rabbitTemplate;

    /**
     * 无需绑定routingkey
     */
    public void send(){
        for (int i = 0; i < 10; i++) {
            User user=new User();
            user.setId(i);
            user.setName("陈sir");
            user.setSex("男");
//            rabbitTemplate.convertAndSend("DirectExchange-01","key-01",user);
            rabbitTemplate.convertAndSend("FanoutExchange-01",null,user);
        }
    }

}

消费者

@Component
public class FanoutConsumer {

    @RabbitHandler
    @RabbitListener(queues = "FanoutQueue-01")
    public void processA(User user) {
        System.out.println("A 接受到消息,并正常处理结束"+ JSONUtil.toJsonStr(user));
    }

    @RabbitHandler
    @RabbitListener(queues = "FanoutQueue-02")
    public void processB(User user) {
        System.out.println("B 接受到消息,并正常处理结束"+ JSONUtil.toJsonStr(user));
    }
}