(三)RabbitMQ七种模式介绍与代码演示

Lison , v1.0.0, 2023.06.22

七种模式介绍与代码演示

文章目录

  • 七种模式介绍与代码演示
    • 四大交换机
      • 四种交换机介绍
    • 工作模式
      • 简单模式(Hello World)
      • 工作队列模式(Work queues)
      • 订阅模式(Publish/Subscribe)
      • 路由模式(Routing)
      • 主题模式(Topics)
      • 远程过程调用(RPC)
      • 发布者确认(Publisher Confirms)
    • 代码演示
      • 简单模式
      • 工作队列模式
      • 发布订阅模式
      • 路由模式
      • 主题模式
    • SpringBoot整合RabbitMQ
      • 引入依赖基础配置
      • 生产者
      • 消费者

四大交换机

交换机概念

  • 交换机可以理解成具有路由表的路由程序,仅此而已。每个消息都有一个称为路由键(routing key)的属性,就是一个简单的字符串。
  • 最新版本的RabbitMQ有四种交换机类型,分别是Direct exchange、Fanout exchange、Topic exchange、Headers exchange。
  • 交换机的作用: 生产者向broker(rabbitmq服务器)发送消息,交换机通过生产者绑定的路由键,将消息推送到不同的消息队列中。而消费者,只绑定队列,从队列中获取消息。
  • 以上三种类型的发送精准顺序为:点对点类型 > 通配符类型 > 广播类型

四种交换机介绍

  • 直连交换机(Direct exchange): 具有路由功能的交换机,绑定到此交换机的时候需要指定一个routing_key,交换机发送消息的时候需要routing_key,会将消息发送道对应的队列
  • 扇形交换机(Fanout exchange): 广播消息到所有队列,没有任何处理,速度最快
  • 主题交换机(Topic exchange): 在直连交换机基础上增加模式匹配,也就是对routing_key进行模式匹配,*代表一个单词,#代表多个单词
  • 首部交换机(Headers exchange): 忽略routing_key,使用Headers信息(一个Hash的数据结构)进行匹配,优势在于可以有更多更灵活的匹配规则

交换机参数

  1. name: 交换机名称
  2. type: 交换机类型 direct,topic,fanout,headers
  3. durability: 是否需要持久化,true 为持久化
  4. auto delete: 当最后一个绑定到 Exchange 上的队列被删除后,Exchange 就没有绑定的队列了,自动删除该 Exchange
  5. internal: 当前 Exchange 是否为内部交换机,默认为 false,客户端无法直接发送消息到这个交换机中,只能通过交换机路由到交换机这种方式
  6. arguments: 扩展参数,用于扩展 AMQP 协议自制定化使用

工作模式

简单模式(Hello World)

在这里插入图片描述

做最简单的事情,一个生产者对应一个消费者,RabbitMQ相当于一个消息代理,负责将A的消息转发给B

应用场景: 将发送的电子邮件放到消息队列,然后邮件服务在队列中获取邮件并发送给收件人

工作队列模式(Work queues)

(三)RabbitMQ七种模式介绍与代码演示_第1张图片

在多个消费者之间分配任务(竞争的消费者模式),一个生产者对应多个消费者,一般适用于执行资源密集型任务,单个消费者处理不过来,需要多个消费者进行处理

应用场景: 一个订单的处理需要10s,有多个订单可以同时放到消息队列,然后让多个消费者同时处理,这样就是并行了,而不是单个消费者的串行情况

订阅模式(Publish/Subscribe)

(三)RabbitMQ七种模式介绍与代码演示_第2张图片

一次向许多消费者发送消息,一个生产者发送的消息会被多个消费者获取,也就是将消息将广播到所有的消费者中。

应用场景: 更新商品库存后需要通知多个缓存和多个数据库,这里的结构应该是:

  • 一个fanout类型交换机扇出两个个消息队列,分别为缓存消息队列、数据库消息队列
  • 一个缓存消息队列对应着多个缓存消费者
  • 一个数据库消息队列对应着多个数据库消费者

路由模式(Routing)

(三)RabbitMQ七种模式介绍与代码演示_第3张图片

有选择地(Routing key)接收消息,发送消息到交换机并且要指定路由key ,消费者将队列绑定到交换机时需要指定路由key,仅消费指定路由key的消息

应用场景: 如在商品库存中增加了1台iphone12,iphone12促销活动消费者指定routing key为iphone12,只有此促销活动会接收到消息,其它促销活动不关心也不会消费此routing key的消息

主题模式(Topics)

(三)RabbitMQ七种模式介绍与代码演示_第4张图片

根据主题(Topics)来接收消息,将路由key和某模式进行匹配,此时队列需要绑定在一个模式上,#匹配一个词或多个词,*只匹配一个词。

应用场景: 同上,iphone促销活动可以接收主题为iphone的消息,如iphone12、iphone13等

远程过程调用(RPC)

(三)RabbitMQ七种模式介绍与代码演示_第5张图片

如果我们需要在远程计算机上运行功能并等待结果就可以使用RPC,具体流程可以看图。应用场景:需要等待接口返回数据,如订单支付

发布者确认(Publisher Confirms)

与发布者进行可靠的发布确认,发布者确认是RabbitMQ扩展,可以实现可靠的发布。在通道上启用发布者确认后,RabbitMQ将异步确认发送者发布的消息,这意味着它们已在服务器端处理。

应用场景: 对于消息可靠性要求较高,比如钱包扣款

代码演示

代码中没有对后面两种模式演示,有兴趣可以自己研究

简单模式

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;

import java.io.IOException;
import java.util.concurrent.TimeoutException;

public class SimpleQueueSender {

    private final static String QUEUE_NAME = "simple_queue";

    public static void main(String[] args) throws IOException, TimeoutException {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("127.0.0.1");
        factory.setPort(5672);
        factory.setUsername("admin");
        factory.setPassword("123456");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        // 声明队列
        // queue:队列名
        // durable:是否持久化
        // exclusive:是否排外  即只允许该channel访问该队列   一般等于true的话用于一个队列只能有一个消费者来消费的场景
        // autoDelete:是否自动删除  消费完删除
        // arguments:其他属性
        channel.queueDeclare(QUEUE_NAME, false, false, false, null);

        //消息内容
        String message = "simplest mode message";
        channel.basicPublish("", QUEUE_NAME, null, message.getBytes());
        System.out.println("[x]Sent '" + message + "'");

        //最后关闭通关和连接
        channel.close();
        connection.close();

    }
}
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;

import java.io.IOException;
import java.util.concurrent.TimeoutException;


public class SimpleQueueReceiver {

    private final static String QUEUE_NAME = "simple_queue";

    public static void main(String[] args) throws IOException, InterruptedException, TimeoutException {
        // 获取连接
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        factory.setPort(5672);
        factory.setUsername("admin");
        factory.setPassword("123456");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        channel.queueDeclare(QUEUE_NAME, false, false, false, null);

        DeliverCallback deliverCallback = (consumerTag, delivery) -> {
            String message = new String(delivery.getBody(), "UTF-8");
            System.out.println(" [x] Received  '" +
                    delivery.getEnvelope().getRoutingKey() + "':'" + message + "'");
        };
        channel.basicConsume(QUEUE_NAME, true, deliverCallback, consumerTag -> {
        });

        System.out.println("----");
    }
}

工作队列模式

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;

import java.io.IOException;
import java.util.concurrent.TimeoutException;

public class QueueWorkReceiver1 {

    private final static String QUEUE_NAME = "queue_work";

    public static void main(String[] args) throws IOException, InterruptedException, TimeoutException {
          // 获取连接
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        factory.setPort(5672);
        factory.setUsername("admin");
        factory.setPassword("123456");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        channel.queueDeclare(QUEUE_NAME, false, false, false, null);
        // 同一时刻服务器只会发送一条消息给消费者
        channel.basicQos(1);

        DeliverCallback deliverCallback = (consumerTag, delivery) -> {
            String message = new String(delivery.getBody(), "UTF-8");
            System.out.println(" [x] Received '" +
                    delivery.getEnvelope().getRoutingKey() + "':'" + message + "'");
        };
        channel.basicConsume(QUEUE_NAME, true, deliverCallback, consumerTag -> {
        });

    }
}
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;

import java.io.IOException;
import java.util.concurrent.TimeoutException;

public class QueueWorkReceiver2 {

    private final static String QUEUE_NAME = "queue_work";

    public static void main(String[] args) throws IOException, InterruptedException, TimeoutException {
          // 获取连接
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        factory.setPort(5672);
        factory.setUsername("admin");
        factory.setPassword("123456");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        channel.queueDeclare(QUEUE_NAME, false, false, false, null);
        // 同一时刻服务器只会发送一条消息给消费者
        channel.basicQos(1);

        DeliverCallback deliverCallback = (consumerTag, delivery) -> {
            String message = new String(delivery.getBody(), "UTF-8");
            System.out.println(" [x] Received '" +
                    delivery.getEnvelope().getRoutingKey() + "':'" + message + "'");
        };
        channel.basicConsume(QUEUE_NAME, true, deliverCallback, consumerTag -> {
        });

    }
}
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;

import java.io.IOException;
import java.util.concurrent.TimeoutException;


public class QueueWorkSender {

    private final static String QUEUE_NAME = "queue_work";

    public static void main(String[] args) throws IOException, InterruptedException, TimeoutException {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        factory.setPort(5672);
        factory.setUsername("admin");
        factory.setPassword("123456");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        // 声明队列
        channel.queueDeclare(QUEUE_NAME, false, false, false, null);
        for (int i = 0; i < 100; i++) {
            String message = "work mode message" + i;
            channel.basicPublish("", QUEUE_NAME, null, message.getBytes());
            System.out.println("[x] Sent '" + message + "'");
            Thread.sleep(i * 10);
        }

        channel.close();
        connection.close();
    }
}

发布订阅模式

package com.lison.upgrade.middleware.rabbitmq;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;

public class PublishSubscribeReceive1 {

    private static final String EXCHANGE_NAME = "logs";

    public static void main(String[] argv) throws Exception {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        factory.setPort(5672);
        factory.setUsername("admin");
        factory.setPassword("123456");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();


        channel.exchangeDeclare(EXCHANGE_NAME, "fanout");
        String queueName = channel.queueDeclare().getQueue();
        channel.queueBind(queueName, EXCHANGE_NAME, "");

        System.out.println(" [*] Waiting for messages. To exit press CTRL+C");

        // 订阅消息的回调函数
        DeliverCallback deliverCallback = (consumerTag, delivery) -> {
            String message = new String(delivery.getBody(), "UTF-8");
            System.out.println(" [x] Received '" + message + "'");
        };

        // 消费者,有消息时出发订阅回调函数
        channel.basicConsume(queueName, true, deliverCallback, consumerTag -> {
        });
    }
}
package com.lison.upgrade.middleware.rabbitmq;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;

public class PublishSubscribeReceive2 {

    private static final String EXCHANGE_NAME = "logs";

    public static void main(String[] argv) throws Exception {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        factory.setPort(5672);
        factory.setUsername("admin");
        factory.setPassword("123456");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();


        channel.exchangeDeclare(EXCHANGE_NAME, "fanout");
        String queueName = channel.queueDeclare().getQueue();
        channel.queueBind(queueName, EXCHANGE_NAME, "");

        System.out.println(" [*] Waiting for messages. To exit press CTRL+C");

        // 订阅消息的回调函数
        DeliverCallback deliverCallback = (consumerTag, delivery) -> {
            String message = new String(delivery.getBody(), "UTF-8");
            System.out.println(" [x] Received2 '" + message + "'");
        };

        // 消费者,有消息时出发订阅回调函数
        channel.basicConsume(queueName, true, deliverCallback, consumerTag -> {
        });
    }
}
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;

public class PublishSubscribeSender {

    private static final String EXCHANGE_NAME = "logs";

    public static void main(String[] argv) throws Exception {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        factory.setPort(5672);
        factory.setUsername("admin");
        factory.setPassword("123456");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();


        channel.exchangeDeclare(EXCHANGE_NAME, "fanout");

        String message = "publish subscribe message";
        channel.basicPublish(EXCHANGE_NAME, "", null, message.getBytes("UTF-8"));
        System.out.println(" [x] Sent '" + message + "'");

        channel.close();
        connection.close();
    }
}

路由模式

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;

import java.io.IOException;
import java.util.concurrent.TimeoutException;


public class QueueRoutingReceiver1 {

    private final static String QUEUE_NAME = "queue_routing";
    private final static String EXCHANGE_NAME = "exchange_direct";

    public static void main(String[] args) throws IOException, TimeoutException {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        factory.setPort(5672);
        factory.setUsername("admin");
        factory.setPassword("123456");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();


        channel.queueDeclare(QUEUE_NAME, false, false, false, null);
        // 指定路由的key,接收key和key2
        channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "key");
        channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "key2");

        channel.basicQos(1);

        DeliverCallback deliverCallback = (consumerTag, delivery) -> {
            String message = new String(delivery.getBody(), "UTF-8");
            System.out.println(" [x] Received '" +
                    delivery.getEnvelope().getRoutingKey() + "':'" + message + "'");
        };
        channel.basicConsume(QUEUE_NAME, true, deliverCallback, consumerTag -> {
        });
    }

}
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;

import java.io.IOException;
import java.util.concurrent.TimeoutException;


public class QueueRoutingReceiver2 {

    private final static String QUEUE_NAME = "queue_routing2";
    private final static String EXCHANGE_NAME = "exchange_direct";

    public static void main(String[] args) throws IOException, TimeoutException {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        factory.setPort(5672);
        factory.setUsername("admin");
        factory.setPassword("123456");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();


        channel.queueDeclare(QUEUE_NAME, false, false, false, null);
        // 仅接收key2
        channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "key2");

        channel.basicQos(1);

        DeliverCallback deliverCallback = (consumerTag, delivery) -> {
            String message = new String(delivery.getBody(), "UTF-8");
            System.out.println(" [x] Received '" +
                    delivery.getEnvelope().getRoutingKey() + "':'" + message + "'");
        };
        channel.basicConsume(QUEUE_NAME, true, deliverCallback, consumerTag -> {
        });


    }
}
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;

import java.io.IOException;
import java.util.concurrent.TimeoutException;


public class QueueRoutingSender {

    private final static String EXCHANGE_NAME = "exchange_direct";
    private final static String EXCHANGE_TYPE = "direct";

    public static void main(String[] args) throws IOException, TimeoutException {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        factory.setPort(5672);
        factory.setUsername("admin");
        factory.setPassword("123456");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        // 交换机声明
        channel.exchangeDeclare(EXCHANGE_NAME, EXCHANGE_TYPE);

        // 只有routingKey相同的才会消费
        String message = "routing mode message";
        channel.basicPublish(EXCHANGE_NAME, "key2", null, message.getBytes());
        System.out.println("[x] Sent '" + message + "'");
//        channel.basicPublish(EXCHANGE_NAME, "key", null, message.getBytes());
//        System.out.println("[x] Sent '" + message + "'");

        channel.close();
        connection.close();
    }
}

主题模式

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;

import java.io.IOException;
import java.util.concurrent.TimeoutException;


public class Receiver1 {

    private final static String QUEUE_NAME = "queue_topic";
    private final static String EXCHANGE_NAME = "exchange_topic";

    public static void main(String[] args) throws IOException, InterruptedException, TimeoutException {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        factory.setPort(5672);
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        channel.queueDeclare(QUEUE_NAME, false, false, false, null);
        // 可以接收key.1
        channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "key.*");

        channel.basicQos(1);

        DeliverCallback deliverCallback = (consumerTag, delivery) -> {
            String message = new String(delivery.getBody(), "UTF-8");
            System.out.println(" [x] Received '" +
                    delivery.getEnvelope().getRoutingKey() + "':'" + message + "'");
        };
        channel.basicConsume(QUEUE_NAME, true, deliverCallback, consumerTag -> {
        });
    }
}
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.DeliverCallback;

import java.io.IOException;
import java.util.concurrent.TimeoutException;

public class Receiver2 {

    private final static String QUEUE_NAME = "queue_topic2";
    private final static String EXCHANGE_NAME = "exchange_topic";
    private final static String EXCHANGE_TYPE = "topic";

    public static void main(String[] args) throws IOException, InterruptedException, TimeoutException {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        factory.setPort(5672);
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        channel.queueDeclare(QUEUE_NAME, false, false, false, null);
        // *号代表单个单词,可以接收key.1
        channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "*.*");
        // #号代表多个单词,可以接收key.1.2
        channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, "*.#");

        channel.basicQos(1);

        DeliverCallback deliverCallback = (consumerTag, delivery) -> {
            String message = new String(delivery.getBody(), "UTF-8");
            System.out.println(" [x] Received '" +
                    delivery.getEnvelope().getRoutingKey() + "':'" + message + "'");
        };
        channel.basicConsume(QUEUE_NAME, true, deliverCallback, consumerTag -> {
        });
    }
}
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;

import java.io.IOException;
import java.util.concurrent.TimeoutException;


public class Sender {

    private final static String EXCHANGE_NAME = "exchange_topic";
    private final static String EXCHANGE_TYPE = "topic";

    public static void main(String[] args) throws IOException, TimeoutException {
        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        factory.setPort(5672);
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        channel.exchangeDeclare(EXCHANGE_NAME, EXCHANGE_TYPE);

        String message = "topics model message with key.1";
        channel.basicPublish(EXCHANGE_NAME, "key.1", null, message.getBytes());
        System.out.println("[x] Sent '" + message + "'");
        String message2 = "topics model message with key.1.2";
        channel.basicPublish(EXCHANGE_NAME, "key.1.2", null, message2.getBytes());
        System.out.println("[x] Sent '" + message2 + "'");

        channel.close();
        connection.close();
    }
}

SpringBoot整合RabbitMQ

引入依赖基础配置

1、创建SpringBoot项目,引入RabbitMQ起步依赖


<dependency>
    <groupId>org.springframework.bootgroupId>
    <artifactId>spring-boot-starter-amqpartifactId>
dependency>

2、写配置文件

spring:
 rabbitmq:
   host: 127.0.0.1
   port: 5672
   username: admin
   password: 123456
   virtual-host: /
#日志格式
logging:
 pattern:
   console: '%d{HH:mm:ss.SSS} %clr(%-5level) --- [%-15thread] %cyan(%-50logger{50}):%msg%n'

SpringBoot整合RabbitMQ时,需要在配置类创建队列和交换机,写法如下:

@Configuration
public class RabbitConfig {
    private final String EXCHANGE_NAME = "boot_topic_exchange";
    private final String QUEUE_NAME = "boot_queue";
    // 创建交换机
    @Bean("bootExchange")
    public Exchange getExchange() {
        return ExchangeBuilder
               .topicExchange(EXCHANGE_NAME) // 交换机类型
               .durable(true) // 是否持久化
               .build();
          }
    // 创建队列
    @Bean("bootQueue")
    public Queue getMessageQueue() {
        return new Queue(QUEUE_NAME); // 队列名
   }
    // 交换机绑定队列
    @Bean
    public Binding bindMessageQueue(@Qualifier("bootExchange") Exchange exchange, @Qualifier("bootQueue") Queue queue) {
        return BindingBuilder
               .bind(queue)
               .to(exchange)
               .with("#.message.#")
               .noargs();
   }
}



生产者

SpringBoot整合RabbitMQ时,提供了工具类RabbitTemplate发送消息,编写生产者时只需要注入RabbitTemplate即可发送消息。

@SpringBootTest
public class TestProducer {
    // 注入RabbitTemplate工具类
    @Autowired
    private RabbitTemplate rabbitTemplate;
    @Test
    public void testSendMessage(){
        /**
         * 发送消息
         * 参数1:交换机
         * 参数2:路由key
         * 参数3:要发送的消息
         */
      rabbitTemplate.convertAndSend("boot_topic_exchange","message","这个是生产者发送消息!");
   }
}

在这里插入图片描述

消费者

@Component
public class Consumer {
    // 监听队列
    @RabbitListener(queues = "boot_queue")
    public void listen_message(String message){
        System.out.println("发送短信:"+message);
   }
}

启动项目,可以看到消费者会消费队列中的消息

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