2.1 Confirm確認消息

消息的確認是指生產者投遞消息後，如果Broker收到消息，則會給我們生產者一個應答。生產者進行接受應答，用來確認這條消息是否正常的發送到Broker，這種方式也是消息投靠信投遞的核心保障！

如何實現Confirm確認消息？
第一步：在channel上開啓確認模式：channel.confirmSelect()
第二部：在channel上添加監聽：addConfirmListener，監聽成功和失敗的返回結果，根據具體的結果對消息進行重新發送、或記錄日誌等後續處理！

生產者代碼

package com.star.movie.confirm;

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

import java.io.IOException;

/**
 * @Description：生產者
 * @author:kaili
 * @Date: 2019-04-22 17:23
 **/
public class ConfirmProducer {

    public static void main(String[] args) throws Exception{
        //2獲取Connection
        Connection connection = Constant.getConnection();
        //3 通過Connection創建一個新的Channel
        Channel channel = connection.createChannel();
        //4 指定我們的消息投遞模式: 消息的確認模式
        channel.confirmSelect();
        //5 發送一條消息
        String exchangeName = "test_confirm_exchange";
        String routingKey = "confirm.save";
        String msg = "Hello RabbitMQ Send confirm message!";
        channel.basicPublish(exchangeName,routingKey,null,msg.getBytes());
        //6 添加一個確認監聽
        channel.addConfirmListener(new ConfirmListener() {
            @Override
            public void handleAck(long deliveryTag, boolean multiple) throws IOException {
                System.err.println("-------ack!-----------");
            }

            @Override
            public void handleNack(long deliveryTag, boolean multiple) throws IOException {
                System.err.println("-------no ack!-----------");
            }
        });
    }

}

生產者代碼

package com.star.movie.confirm;

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

/**
 * @Description：消費者
 * @author:kaili
 * @Date: 2019-04-22 17:28
 **/
public class ConfirmConsumer {

    public static void main(String[] args) throws  Exception{
        //2 獲取Connection
        Connection connection = Constant.getConnection();
        //3 通過Connection創建一個新的Channel
        Channel channel = connection.createChannel();

        String exchangeName = "test_confirm_exchange";
        String routingKey = "confirm.#";
        String queueName = "test_confirm_queue";

        //4 聲明交換機和隊列 然後進行綁定設置, 最後制定路由Key
        channel.exchangeDeclare(exchangeName, "topic", true);
        channel.queueDeclare(queueName, true, false, false, null);
        channel.queueBind(queueName, exchangeName, routingKey);

        //5 創建消費者
        QueueingConsumer queueingConsumer = new QueueingConsumer(channel);
        channel.basicConsume(queueName, true, queueingConsumer);

        while(true){
            Delivery delivery = queueingConsumer.nextDelivery();
            String msg = new String(delivery.getBody());

            System.err.println("消費端: " + msg);
        }
    }
}

step 1 啓動消費者代碼
生成test_confirm_exchange交換機綁定test_confirm_queue隊列
step 2 啓動生產者代碼
觀察生產者控制檯，打印了投遞消息成功的ack消息

觀察消費者控制檯

消費者將隊列的消息消費完成