RabbitMQ的mandatory参数测试

川长思鸟来 2021-07-24 14:43 337阅读 0赞

**一 代码**

package com.rabbitmq;
    
    import com.rabbitmq.client.*;
    import com.rabbitmq.util.ConnectionUtils;
    import java.io.IOException;
    import java.util.concurrent.TimeoutException;
    
    /**
    * 生产者Mandatory参数测试
    */
    public class Mandatory {
        private static final String EXCHANGE_NAME = "exchange_demo";
        private static final String ROUTING_KEY = "routingkey_demo";
        private static final String QUEUE_NAME = "queue_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, InterruptedException {
            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
            channel.queueDeclare(QUEUE_NAME, true, false, false, null);
            // 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, "", true,
                    MessageProperties.PERSISTENT_TEXT_PLAIN,
                    message.getBytes());
            // 消息返回监听器
            channel.addReturnListener(new ReturnListener() {
                // 处理返回
                public void handleReturn(int i, String s, String s1, String s2,
                                         AMQP.BasicProperties basicProperties,
                                         byte[] bytes) throws IOException {
                    String msg = new String(bytes);
                    System.out.println(String.format("Basic Return返回的结果: %s", msg));
                }
            });
        }
    }

**二 测试**

控制台输出如下，消息被返回给生产者。

Basic Return返回的结果: Hello World !

**三 说明**

当basicPublish的mandatory参数设置为false时，如果消息没有被正确路由，消息会丢弃，不会返回给生产者。

**四 流程说明**

![20200507105730498.png][]

**五 参考代码**

[https://github.com/cakin24/RabbitMQDemo/blob/master/src/main/java/com/rabbitmq/Mandatory.java][https_github.com_cakin24_RabbitMQDemo_blob_master_src_main_java_com_rabbitmq_Mandatory.java]

https://gitee.com/cakin24/RabbitMQDemo/tree/master/src/main/java/com/rabbitmq/msgdirection/mandatory

[20200507105730498.png]: /images/20210724/2bfa1304b6fe4eab8be57c209b80fb36.png
[https_github.com_cakin24_RabbitMQDemo_blob_master_src_main_java_com_rabbitmq_Mandatory.java]: https://github.com/cakin24/RabbitMQDemo/blob/master/src/main/java/com/rabbitmq/Mandatory.java