设置消息TTL——通过队列进行设置

朱雀 2021-07-24 14:49 413阅读 0赞

**一 代码**

package com.rabbitmq.ttl;
    
    import com.rabbitmq.client.*;
    import com.rabbitmq.util.ConnectionUtils;
    import java.io.IOException;
    import java.util.HashMap;
    import java.util.Map;
    import java.util.concurrent.TimeoutException;
    
    /**
    * 消息过期（通过队列设置）
    */
    public class MsgTTL2 {
        private static final String EXCHANGE_NAME = "exchange_demo";
        private static final String ROUTING_KEY = "routingkey_demo";
        private static final String QUEUE_NAME = "msgTTL2_demo";
        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();
            // 创建一个 type="direct" 、持久化的、非自动删除的交换器
            channel.exchangeDeclare(EXCHANGE_NAME, "direct", true, false, null);
            // 创建一个持久化、非排他的、非自动删除的队列
            Map<String, Object> arg = new HashMap<String, Object>(3);
            // 设置队列中消息过期时间，30秒过期（毫秒为单位）
            arg.put("x-message-ttl", 30000);
            channel.queueDeclare(QUEUE_NAME, true, false, false, arg);
            // 将交换器与队列通过路由键绑定
            channel.queueBind(QUEUE_NAME, EXCHANGE_NAME, ROUTING_KEY);
            // 发送一条持久化的消息: hello world !
            String message = "Hello World !";
            // 消息发布
            // 第三个参数为mandatory
            channel.basicPublish(EXCHANGE_NAME, ROUTING_KEY, false,
                    MessageProperties.PERSISTENT_TEXT_PLAIN,
                    message.getBytes());
            ConnectionUtils.close(channel, connection);
        }
    }

**二 测试**

1 30秒内查看队列中的消息——消息还存在

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70][]

2 30秒后查看队列中的消息——消息已经丢弃了

![20200104194853478.png][]

**三 参考代码**

[https://github.com/cakin24/RabbitMQDemo/blob/master/src/main/java/com/rabbitmq/ttl/MsgTTL2.java][https_github.com_cakin24_RabbitMQDemo_blob_master_src_main_java_com_rabbitmq_ttl_MsgTTL2.java]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70]: /images/20210724/a11cf975ed3c4caf8790d938025536c5.png
[20200104194853478.png]: /images/20210724/aa1f44d32cc449abb79c0f0e9c0aaee5.png
[https_github.com_cakin24_RabbitMQDemo_blob_master_src_main_java_com_rabbitmq_ttl_MsgTTL2.java]: https://github.com/cakin24/RabbitMQDemo/blob/master/src/main/java/com/rabbitmq/ttl/MsgTTL2.java