rabbitmq消费端的nack和重回队列的总结

 重回队列模式，是当投递消息失败时，让该消息重新回到队列的模式，该模式需要手动签收，并需要在消费者中进行判断，调用重回队列的确认模式

消费者

package com.flying.rabbitmq.api.ack;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;

public class Consumer {

    
    public static void mainString[] args) throws Exception {
        
        
        ConnectionFactory connectionFactory = new ConnectionFactory);
        connectionFactory.setHost"127.0.0.1");
        connectionFactory.setPort5672);
        connectionFactory.setVirtualHost"/");
        
        Connection connection = connectionFactory.newConnection);
        Channel channel = connection.createChannel);
        
        
        String exchangeName = "test_ack_exchange";
        String queueName = "test_ack_queue";
        String routingKey = "ack.#";
        
        channel.exchangeDeclareexchangeName, "topic", true, false, null);
        channel.queueDeclarequeueName, true, false, false, null);
        channel.queueBindqueueName, exchangeName, routingKey);
        
        // 手工签收 必须要关闭 autoAck = false
        channel.basicConsumequeueName, false, new MyConsumerchannel));
        
        
    }
}

自定义消费者：

package com.flying.rabbitmq.api.ack;

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

import java.io.IOException;

public class MyConsumer extends DefaultConsumer {


    private Channel channel ;
    
    public MyConsumerChannel channel) {
        superchannel);
        this.channel = channel;
    }

    @Override
    public void handleDeliveryString consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) throws IOException {
        System.err.println"-----------consume message----------");
        System.err.println"body: " + new Stringbody));
        try {
            Thread.sleep2000);
        } catch InterruptedException e) {
            e.printStackTrace);
        }
        ifInteger)properties.getHeaders).get"num") == 0) {
            channel.basicNackenvelope.getDeliveryTag), false, true);
        } else {
            channel.basicAckenvelope.getDeliveryTag), false);
        }
        
    }


}

生产者：

package com.flying.rabbitmq.api.ack;

import com.rabbitmq.client.AMQP;
import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;

import java.util.HashMap;
import java.util.Map;

public class Producer {

    
    public static void mainString[] args) throws Exception {
        
        ConnectionFactory connectionFactory = new ConnectionFactory);
        connectionFactory.setHost"127.0.0.1");
        connectionFactory.setPort5672);
        connectionFactory.setVirtualHost"/");
        
        Connection connection = connectionFactory.newConnection);
        Channel channel = connection.createChannel);
        
        String exchange = "test_ack_exchange";
        String routingKey = "ack.save";
        
        
        
        forint i =0; i<5; i ++){
            
            Map<String, Object> headers = new HashMap<String, Object>);
            headers.put"num", i);
            
            AMQP.BasicProperties properties = new AMQP.BasicProperties.Builder)
                    .deliveryMode2)
                    .contentEncoding"UTF-8")
                    .headersheaders)
                    .build);
            String msg = "Hello RabbitMQ ACK Message " + i;
            channel.basicPublishexchange, routingKey, true, properties, msg.getBytes));
        }
        
    }
}