springBoot集成rabbitmq 之发布/订阅模式模式(Publish/Subscribe)

﹏ヽ暗。殇╰゛Y 2024-03-27 16:25 204阅读 0赞

### springBoot集成rabbitmq之发布/订阅模式模式(Publish/Subscribe) ###

**springBoot整合rabbitmq的例子: https://blog.csdn.net/weixin\_45730866/article/details/128971917，建议先看。**  
**comsumer服务**

配置类

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 RabbitPublishSubscribeConfig {
         
        /**
         * Queue 可以有4个参数
         *      1.name           队列名
         *      2.durable       持久化消息队列 ,rabbitmq重启的时候不需要创建新的队列 默认true
         *      3.auto-delete   表示消息队列没有在使用时将被自动删除 默认是false
         *      4.exclusive     表示该消息队列是否只在当前connection生效,默认是false
         */
        @Bean
        public Queue createPublishSubscribeQueueA() {
        
            return new Queue("PublishSubscribeQueueA",true);
        }
        @Bean
        public Queue createPublishSubscribeQueueB() {
        
            return new Queue("PublishSubscribeQueueB",true);
        }
        @Bean
        public Queue createPublishSubscribeQueueC() {
        
            return new Queue("PublishSubscribeQueueC",true);
        }
    
        @Bean
        public FanoutExchange  publishSubscribeExchange() {
        
            //配置广播路由器
            return new FanoutExchange("PublishSubscribeExchange");
        }
    
        @Bean
        public Binding bingQueueAToPublishSubscribeExchange() {
        
            return BindingBuilder.bind(createPublishSubscribeQueueA()).to(publishSubscribeExchange());
        }
    
        @Bean
        public Binding bingQueueBToPublishSubscribeExchange() {
        
            return BindingBuilder.bind(createPublishSubscribeQueueB()).to(publishSubscribeExchange());
        } 
        @Bean
        public Binding bingQueueCToPublishSubscribeExchange() {
        
            return BindingBuilder.bind(createPublishSubscribeQueueC()).to(publishSubscribeExchange());
        } 
    }

接收者A B C

import org.springframework.amqp.rabbit.annotation.RabbitHandler;
    import org.springframework.amqp.rabbit.annotation.RabbitListener;
    import org.springframework.stereotype.Component; 
    import java.util.Date; 
    @Component
    @RabbitListener(queues = "PublishSubscribeQueueA")
    public class ReceiverA {
        
        @RabbitHandler
        public void process(String message) {
        
            System.out.println("接收者A : " + message +","+ new Date());
        }
    }

import org.springframework.amqp.rabbit.annotation.RabbitHandler;
    import org.springframework.amqp.rabbit.annotation.RabbitListener;
    import org.springframework.stereotype.Component;
    import java.util.Date; 
     
    @Component
    @RabbitListener(queues = "PublishSubscribeQueueB")
    public class ReceiverB {
        
        @RabbitHandler
        public void process(String message) {
        
            System.out.println("接收者B : " + message +","+ new Date());
        }
    }

import org.springframework.amqp.rabbit.annotation.RabbitHandler;
    import org.springframework.amqp.rabbit.annotation.RabbitListener;
    import org.springframework.stereotype.Component;
    import java.util.Date; 
    @Component
    @RabbitListener(queues = "PublishSubscribeQueueC")
    public class ReceiverC {
        
        @RabbitHandler
        public void process(String message) {
        
            System.out.println("接收者C : " + message +","+ new Date());
        }
    }

**producer**  
  
  
发送者

import org.springframework.amqp.rabbit.connection.CorrelationData;
    import org.springframework.amqp.rabbit.core.RabbitTemplate;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Component;
    
    import java.util.Date;
    import java.util.UUID;
    
    @Component
    public class PublishSubscribeSender {
        
    	@Autowired
    	private RabbitTemplate rabbitTemplate;
    	public void send(int i) {
        
    		CorrelationData correlationData = new CorrelationData(UUID.randomUUID().toString());
    		String msg = "消息是"+i;
    		//消息发送，使用void convertAndSend(String exchange, String routingKey, Object message) throws AmqpException;
    		//但不指定routingKey。因为FanoutExchange类型的交换机，routingKey不起作用，它向所有的队列发送广播，只要队列绑定到该交换机即接受消息。
    		rabbitTemplate.convertAndSend("PublishSubscribeExchange","",msg,correlationData);
    		System.out.println("发送成功 "+new Date()+" "+msg);
    	}
    }

测试类

import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RequestMapping
    @RestController
    public class PublishSubscribeTestsController {
         
        @Autowired
        private PublishSubscribeSender publishSubscribeSender; 
        @GetMapping("publishSubscribe")
        public String publishSubscribe() {
        
            publishSubscribeSender.send(5201314);
            return "publishSubscribeOk";
        } 
    }

然后请求http://127.0.0.1:8080/publishSubscribe，consumer服务控制台如下：

接收者B : 消息是5201314,Mon Feb 13 10:37:30 CST 2023
    接收者C : 消息是5201314,Mon Feb 13 10:37:30 CST 2023
    接收者A : 消息是5201314,Mon Feb 13 10:37:30 CST 2023

produce控制如下：

发送成功 Mon Feb 13 10:37:30 CST 2023 消息是5201314