RabbitMQ消費端自定義監聽（九）

　　場景：

　　　　我們一般在代碼中編寫while循環，進行consumer.nextDelivery方法進行獲取下一條消息，然后進行消費處理。

　　實際環境：

　　　　我們使用自定義的Consumer更加的方便，解耦性更強，也在實際工作中最常用。

　　操作：　　

        //生產端代碼
        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());
        }

        //消費端代碼
        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);
        //使用自定義consumer
        channel.basicConsume(queueName, true, new MyConsumer(channel));    

       //自定義消費端
        //繼承DefaultConsumer類
        public class MyConsumer extends DefaultConsumer {


               public MyConsumer(Channel channel) {
                       super(channel);
               }
    
               //重寫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));
               }

  
          }    

　　　　運行結果：