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发布订阅模式 (fanout)—案例

前言

@RabbitListener和@RabbitHandler的使用

1.通过Spring官网快速创建一个RabbitMQ的生产者项目

2.导入项目后在application.yml文件中配置

# 服务端口
server:port: 8081#配置rabbitmq服务 测试不用写，默认本机
spring:rabbitmq:username: guest #默认账号password: guest #默认密码virtual-host: /host: localhostport: 5672#消息确认配置项#确认消息已发送到交换机： Exchangepublisher-confirm-type: correlated#确认消息已发送到队列: Queuepublisher-returns: true

3.创建一个RabbitMqConfig配置类

package com.exam.RebbitMQ.config;import org.springframework.amqp.core.Binding;
import org.springframework.amqp.core.BindingBuilder;
import org.springframework.amqp.core.FanoutExchange;
import org.springframework.amqp.core.Queue;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;@Configuration
public class RabbitMqConfig {//1:声明注册fanout模式的交换机,参数1：对应的service的fanoutName，参数2：持久化(true,false),参数3：自动删除（false/true）@Beanpublic FanoutExchange fanoutExchange(){return new  FanoutExchange("fanout_order_exchang", true, false);}//2:声明队列 sms.fanout.queue,email.fanout.queue,duanxin.fanout.queue//参数1:名字,参数2:持久化队列true//短信队列@Beanpublic Queue smsQueue() {System.err.println("执行了sms");return new Queue("sms.fanout.queue",true);}@Beanpublic Queue duanxinQueue() {System.err.println("执行了duanxin");return new Queue("duanxin.fanout.queue",true);}//邮箱队列@Beanpublic Queue emailQueue() {System.err.println("执行了email");return new Queue("email.fanout.queue",true);}//3:完成绑定关系(队列和交换机完成绑定关系)@Beanpublic Binding smsBinding() {//把smsQueue放到fanoutExchange交换机上面return BindingBuilder.bind(smsQueue()).to(fanoutExchange());}@Beanpublic Binding duanxinBinding() {//把duanxinQueue放到fanoutExchange交换机上面return BindingBuilder.bind(duanxinQueue()).to(fanoutExchange());}@Beanpublic Binding emailBinding() {//把emailQueue放到fanoutExchange交换机上面return BindingBuilder.bind(emailQueue()).to(fanoutExchange());}}

4. 生产者

• OrderService

package com.exam.RebbitMQ.service;public interface OrderService {void makeOrder(String userid,String productid,int num);
}

• OrderServiceImpl
  

package com.exam.RebbitMQ.service.Impl;import java.util.UUID;import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import com.exam.RebbitMQ.service.OrderService;@Service
public class OrderServiceImpl implements OrderService{@Autowiredprivate RabbitTemplate rabbitTemplate;/*** 模拟用户下单 **/public void makeOrder(String userid,String productid,int num) {//1.根据商品ID查询商品是否充足//2.保存订单String  orderId = UUID.randomUUID().toString();System.err.println("订单生成成功"+orderId);//3.通过MQ来完成消息的分发//参数1:交换机 参数二:路由key/queue队列名称  参数三:消息内容String  exchangName ="fanout_order_exchang";String routingKey = "";rabbitTemplate.convertAndSend(exchangName, routingKey, orderId);}}

5.测试生产者创建mq是否成功

• 在项目的test中发送请求

package com.huyi.rabbitmq;import com.huyi.rabbitmq.service.OrderService;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;@SpringBootTest
class RabbitMqApplicationTests {@Autowiredprivate OrderService orderService;@Testvoid contextLoads() {orderService.makeOrder("1","1", 18);}}

访问网址： http://localhost:15672/#/queues

6.再创建一个消费者项目

• yml配置

# 服务端口
server:port: 8082#配置rabbitmq服务 测试不用写，默认本机
spring:rabbitmq:username: guest #默认账号password: guest #默认密码virtual-host: /host: localhostport: 5672#消息确认配置项#确认消息已发送到交换机： Exchangepublisher-confirm-type: correlated#确认消息已发送到队列: Queuepublisher-returns: true

7. 创建消费者

• SmsConsumerService、SmsConsumerServiceImpl

package com.huyi.rabbitmq_consumber.service;public interface SmsConsumerService {void reviceMessage(String message);
}

package com.huyi.rabbitmq_consumber.service.Impl;import com.huyi.rabbitmq_consumber.service.SmsConsumerService;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;@Component
public class SmsConsumerServiceImpl implements SmsConsumerService {//注意：这里要和生产者RabbitMqConfig文件中的名字对应起来@RabbitListener(queues = {"sms.fanout.queue"})public void reviceMessage(String message) {System.err.println("sms_fanout--接收到了订单信息");}
}

• EmailConsumerService、EmailConsumerServiceImpl

package com.huyi.rabbitmq_consumber.service;public interface EmailConsumerService {void reviceMessage(String message);
}

package com.huyi.rabbitmq_consumber.service.Impl;import com.huyi.rabbitmq_consumber.service.EmailConsumerService;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;@Component
@RabbitListener(queues = {"email.fanout.queue"})
public class EmailConsumerServiceImpl implements EmailConsumerService {@RabbitHandlerpublic void reviceMessage(String message) {System.err.println("Email_fanout--接收到了订单信息"+message);}
}

• DuanxinConsumerService、DuanxinConsumerServiceImpl

package com.huyi.rabbitmq_consumber.service;public interface DuanxinConsumerService {void reviceMessage(String message);
}

package com.huyi.rabbitmq_consumber.service.Impl;import com.huyi.rabbitmq_consumber.service.DuanxinConsumerService;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;@Component
@RabbitListener(queues = {"duanxin.fanout.queue"})
public class DuanxinConsumerServiceImpl implements DuanxinConsumerService {@RabbitHandlerpublic void reviceMessage(String message) {System.err.println("Duanxin_fanout--接收到了订单信息"+message);}}

8.测试消费者接收信息

• 启动消费者项目
  
• 启动生产者项目
  
• 查看消费者项目是否监听到了生产者的信息