RabbitMQ消费端自定义监听

Posted 2022-04-18 luhan777

　　场景：

　　　　我们一般在代码中编写while循环，进行consumer.nextDelivery方法进行获取下一条消息，然后进行消费处理。

　　实际环境：

　　　　我们使用自定义的Consumer更加的方便，解耦性更强，也在实际工作中最常用。

　　操作：　　

        //生产端代码
        ConnectionFactory connectionFactory = new ConnectionFactory();
        connectionFactory.setHost("127.0.0.1");
        connectionFactory.setPort(5672);
        connectionFactory.setVirtualHost("/");
        
        Connection connection = connectionFactory.newConnection();
        Channel channel = connection.createChannel();
        
        String exchange = "test_consumer_exchange";
        String routingKey = "consumer.save";
        
        String msg = "Hello RabbitMQ Consumer Message";
        
        for(int i =0; i<5; i ++)
            channel.basicPublish(exchange, routingKey, true, null, msg.getBytes());
        

        //消费端代码
        ConnectionFactory connectionFactory = new ConnectionFactory();
        connectionFactory.setHost("127.0.0.1");
        connectionFactory.setPort(5672);
        connectionFactory.setVirtualHost("/");
        
        Connection connection = connectionFactory.newConnection();
        Channel channel = connection.createChannel();
        
        
        String exchangeName = "test_consumer_exchange";
        String routingKey = "consumer.#";
        String queueName = "test_consumer_queue";
        
        channel.exchangeDeclare(exchangeName, "topic", true, false, null);
        channel.queueDeclare(queueName, true, false, false, null);
        channel.queueBind(queueName, exchangeName, routingKey);
        //使用自定义consumer
        channel.basicConsume(queueName, true, new MyConsumer(channel));    

       //自定义消费端
        //继承DefaultConsumer类
        public class MyConsumer extends DefaultConsumer 


               public MyConsumer(Channel channel) 
                       super(channel);
               
    
               //重写handleDelivery()
              @Override
              public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException 
                      System.err.println("-----------consume message----------");
                      System.err.println("consumerTag: " + consumerTag);
                      System.err.println("envelope: " + envelope);
                      System.err.println("properties: " + properties);
                      System.err.println("body: " + new String(body));
               

  
              

　　　　运行结果：