RabbitMQ Hello World

Hello World！

1. 依赖

   <groupId>com.rabbitmq</groupId>
   <artifactId>amqp-client</artifactId>
   <version>5.16.0</version>
   

2. 消息发送方

   package org.example;
   
   import com.rabbitmq.client.ConnectionFactory;
   import com.rabbitmq.client.Connection;
   import com.rabbitmq.client.Channel;
   
   import java.io.IOException;
   import java.util.concurrent.TimeoutException;
   
   /**
    * 消息发送方
    */
   public class Send {
       //队列名称
       private static final String QUEUE_NAME = "hello";
   
       /**
        * 向队列发送消息（使用socket连接）
        * @param args
        * @throws Exception
        */
       public static void main(String[] args) throws Exception {
   
           ConnectionFactory factory = new ConnectionFactory();
           factory.setHost("localhost");
           //创建连接
           try (Connection connection = factory.newConnection();
                //创建通道
                Channel channel = connection.createChannel()) {
               //声明一个队列是幂等的--只有当它不存在时才会被创建。
               channel.queueDeclare(QUEUE_NAME, false, false, false, null);
               String message = "Hello World!";
               channel.basicPublish("", QUEUE_NAME, null, message.getBytes());
               System.out.println("[x] Sent '" + message + "'");
           } catch (Exception e) {
               e.printStackTrace();
           }
   
   
       }
   }
   

3. 消费者

   package org.example;
   
   import com.rabbitmq.client.Channel;
   import com.rabbitmq.client.Connection;
   import com.rabbitmq.client.ConnectionFactory;
   import com.rabbitmq.client.DeliverCallback;
   
   /**
    * 消费者
    */
   public class Recv {
       private static final String QUEUE_NAME = "hello";
   
       /**
        * 接收队列中的消息（使用socket连接）
        * 不关闭Connection和Channel是因为希望在消费者异步侦听消息到达时，进程保持活动状态
        * @param args
        * @throws Exception
        */
       public static void main(String[] args) throws Exception {
           ConnectionFactory factory = new ConnectionFactory();
           factory.setHost("localhost");
           Connection connection = factory.newConnection();
           Channel channel = connection.createChannel();
   
           channel.queueDeclare(QUEUE_NAME, false, false, false, null);
           System.out.println("[*] Waiting for message.To exit press CTRL+C");
   
           //消费者执行消费时的回调函数（函数式接口：只有一个方法的接口）
           DeliverCallback deliverCallback=(consumerTag,delivery)->{
               String message = new String(delivery.getBody(), "UTF-8");
               System.out.println("[x] Received '" + message + "'");
           };
           //消费消息
           channel.basicConsume(QUEUE_NAME,true,deliverCallback,consumerTag -> {});
   
   
       }
   }