一 代码

1 生产者延迟3秒发送消息到死信队列代码，此时queue.normal队列充当的是延迟队列

package com.rabbitmq.ttl; 
 
import com.rabbitmq.client.Channel; 
import com.rabbitmq.client.Connection; 
import com.rabbitmq.client.ConnectionFactory; 
import com.rabbitmq.client.MessageProperties; 
import com.rabbitmq.util.ConnectionUtils; 
import java.io.IOException; 
import java.util.HashMap; 
import java.util.Map; 
import java.util.concurrent.TimeoutException; 
 
/** 
* 死信队列（路由键为rk的消息过期后被放置到死信队列） 
*/ 
public class DealQueue { 
    private static final String IP_ADDRESS = "127.0.0.1"; 
    private static final int PORT = 5672;//RabbitMQ（AMQP） 服务端默认端口号为 5672 
    public static void main(String[] args) throws IOException, 
            TimeoutException { 
        ConnectionFactory factory = new ConnectionFactory(); 
        factory.setHost(IP_ADDRESS); 
        factory.setUsername("root"); 
        factory.setPassword("123456"); 
        Connection connection = factory.newConnection(); 
        Channel channel = connection.createChannel(); 
 
        channel.exchangeDeclare("exchange.dlx", "direct", true, false, null); 
        channel.exchangeDeclare("exchange.normal", "fanout", true, false, null); 
 
        Map<String, Object> arg = new HashMap<String, Object>(3); 
        arg.put("x-message-ttl", 3000); 
        arg.put("x-dead-letter-exchange", "exchange.dlx"); 
 
        channel.queueDeclare("queue.normal", false, false, false, arg); 
        channel.queueBind("queue.normal", "exchange.normal", ""); 
 
        channel.queueDeclare("queue.dlx", false, false, false, null); 
        channel.queueBind("queue.dlx", "exchange.dlx", "rk"); 
 
        String message = "delay message !"; 
 
        channel.basicPublish("exchange.normal", "rk", false, 
                MessageProperties.PERSISTENT_TEXT_PLAIN, 
                message.getBytes()); 
 
        ConnectionUtils.close(channel, connection); 
    } 
}

2 消费者从死信队列取消息代码

package com.rabbitmq.delay; 
 
import com.rabbitmq.client.*; 
import java.io.IOException; 
import java.util.concurrent.TimeUnit; 
import java.util.concurrent.TimeoutException; 
 
// 延时消费 
public class DelayQueue { 
    private static final String IP_ADDRESS = "127.0.0.1"; 
    private static final int PORT = 5672;//RabbitMQ（AMQP） 服务端默认端口号为 5672 
    public static void main(String[] args) throws IOException, 
            TimeoutException { 
        ConnectionFactory factory = new ConnectionFactory(); 
        factory.setHost(IP_ADDRESS); 
        factory.setUsername("root"); 
        factory.setPassword("123456"); 
        Connection connection = factory.newConnection(); 
        final Channel channel = connection.createChannel(); 
        channel.basicQos(64); 
        Consumer consumer = new DefaultConsumer(channel) { 
            @Override 
            public void handleDelivery(String consumerTag, 
                                       Envelope envelope, 
                                       AMQP.BasicProperties properties, 
                                       byte[] body) 
                    throws IOException { 
                System.out.println(" recv message: " + new String(body)); 
                try { 
                    TimeUnit.SECONDS.sleep(1); 
                } catch (InterruptedException e) { 
                    e.printStackTrace(); 
                } 
                channel.basicAck(envelope.getDeliveryTag(), false); 
            } 
        }; 
        channel.basicConsume("queue.dlx", consumer); 
    } 
}

二 测试

1 消费者控制台打印如下

recv message: delay message !

三 参考代码

CSDN

CSDN