2.3 RabbitMQ高級特效-自定義消費者

之前的demo都是通過QueueingConsumer對象來消費消息，可以通過繼承DefaultCunsumer類來處理消息。

自定義消費者代碼

package com.star.movie.consumer;

import com.rabbitmq.client.AMQP;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.DefaultConsumer;
import com.rabbitmq.client.Envelope;

import java.io.IOException;

/**
 * @Description：
 * @author:kaili
 * @Date: 2019-04-22 18:05
 **/
public class MyConsumer extends DefaultConsumer {

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

    @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));
    }
}

通過handleDelivery方法來處理消息，打印該方法的參數看都是那些信息。

消費者代碼

package com.star.movie.consumer;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.star.movie.common.Constant;

/**
 * @Description：自定義消費者
 * @author:kaili
 * @Date: 2019-04-22 18:03
 **/
public class ExtendConsumer {
    public static void main(String[] args) throws Exception{
        Connection connection = Constant.getConnection();
        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);

        channel.basicConsume(queueName,true,new MyConsumer(channel));
    }
}

生產者代碼

package com.star.movie.consumer;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.star.movie.common.Constant;

/**
 * @Description：
 * @author:kaili
 * @Date: 2019-04-22 18:03
 **/
public class ConsumerProducer {
    public static void main(String[] args) throws Exception{
        Connection connection = Constant.getConnection();
        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());
        }
    }
}

step 1 啓動消費者代碼
生成類型爲topic的交換機test_consumer_exchange，綁定test_consumer_queue隊列，綁定健爲consumer.#

step 2 啓動生產者代碼
觀察消費者端控制檯打印的信息

Connected to the target VM, address: '127.0.0.1:56342', transport: 'socket'
-----------consume message----------
consumerTag: amq.ctag-odY05-Srxf-XuSTO1TNsDg
envelope: Envelope(deliveryTag=1, redeliver=false, exchange=test_consumer_exchange, routingKey=consumer.save)
properties: #contentHeader<basic>(content-type=null, content-encoding=null, headers=null, delivery-mode=null, priority=null, correlation-id=null, reply-to=null, expiration=null, message-id=null, timestamp=null, type=null, user-id=null, app-id=null, cluster-id=null)
body: Hello RabbitMQ Consumer Message
-----------consume message----------
consumerTag: amq.ctag-odY05-Srxf-XuSTO1TNsDg
envelope: Envelope(deliveryTag=2, redeliver=false, exchange=test_consumer_exchange, routingKey=consumer.save)
properties: #contentHeader<basic>(content-type=null, content-encoding=null, headers=null, delivery-mode=null, priority=null, correlation-id=null, reply-to=null, expiration=null, message-id=null, timestamp=null, type=null, user-id=null, app-id=null, cluster-id=null)
body: Hello RabbitMQ Consumer Message
-----------consume message----------
consumerTag: amq.ctag-odY05-Srxf-XuSTO1TNsDg
envelope: Envelope(deliveryTag=3, redeliver=false, exchange=test_consumer_exchange, routingKey=consumer.save)
properties: #contentHeader<basic>(content-type=null, content-encoding=null, headers=null, delivery-mode=null, priority=null, correlation-id=null, reply-to=null, expiration=null, message-id=null, timestamp=null, type=null, user-id=null, app-id=null, cluster-id=null)
body: Hello RabbitMQ Consumer Message
-----------consume message----------
consumerTag: amq.ctag-odY05-Srxf-XuSTO1TNsDg
envelope: Envelope(deliveryTag=4, redeliver=false, exchange=test_consumer_exchange, routingKey=consumer.save)
properties: #contentHeader<basic>(content-type=null, content-encoding=null, headers=null, delivery-mode=null, priority=null, correlation-id=null, reply-to=null, expiration=null, message-id=null, timestamp=null, type=null, user-id=null, app-id=null, cluster-id=null)
body: Hello RabbitMQ Consumer Message
-----------consume message----------
consumerTag: amq.ctag-odY05-Srxf-XuSTO1TNsDg
envelope: Envelope(deliveryTag=5, redeliver=false, exchange=test_consumer_exchange, routingKey=consumer.save)
properties: #contentHeader<basic>(content-type=null, content-encoding=null, headers=null, delivery-mode=null, priority=null, correlation-id=null, reply-to=null, expiration=null, message-id=null, timestamp=null, type=null, user-id=null, app-id=null, cluster-id=null)
body: Hello RabbitMQ Consumer Message

生產者端投遞的5條消息都在日誌中，在envelope中的deliveryTag標識消息記錄，
body是消息的實體類容。