springcloud stream rabbitmq延时消息发送javabean对象

最新推荐文章于 2023-04-20 16:26:09 发布

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最新推荐文章于 2023-04-20 16:26:09 发布

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分类专栏： SpringCloud

本文链接：https://blog.youkuaiyun.com/zsj777/article/details/115475509

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本文介绍了如何使用Spring Cloud Stream配置应用程序，使其能够发送和接收JSON格式的消息。通过实体类FaceRabbitAddMessage定义消息内容，并在监听器中设置条件，当接收到第三次消息时抛出特定异常，将消息路由到死信队列，避免堆积。同时展示了消息发送类如何设置延迟发送。

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1、参考

https://blog.youkuaiyun.com/zsj777/article/details/115474709

2、配置文件添加

spring.cloud.stream.bindings.example-topic-output.content-type=application/json

3、实体类

package com.example.demo.controller;


import java.io.Serializable;

public class FaceRabbitAddMessage implements Serializable {

    private Integer visitorId;

    private String date;
    //延时发送时间 毫秒
    private Integer delayTime;

    public Integer getVisitorId() {
        return visitorId;
    }

    public void setVisitorId(Integer visitorId) {
        this.visitorId = visitorId;
    }

    public String getDate() {
        return date;
    }

    public void setDate(String date) {
        this.date = date;
    }

    public Integer getDelayTime() {
        return delayTime;
    }

    public void setDelayTime(Integer delayTime) {
        this.delayTime = delayTime;
    }
}

4、Listener修改

package com.example.demo.controller;

import org.springframework.amqp.AmqpRejectAndDontRequeueException;
import org.springframework.cloud.stream.annotation.StreamListener;
import org.springframework.messaging.MessageHeaders;
import org.springframework.messaging.handler.annotation.Headers;
import org.springframework.messaging.handler.annotation.Payload;
import org.springframework.stereotype.Component;

@Component
public class TestListener {
    private int count = 1;

    @StreamListener(TestTopic.INPUT)
    public void receive(@Payload FaceRabbitAddMessage payload, @Headers MessageHeaders messageHeaders) {
        System.out.println(count);
//        设定了计数器count，当count为3的时候抛出AmqpRejectAndDontRequeueException
//    这个特定的异常。此时，当只有当抛出这个异常的时候，才会将消息放入DLQ队列，从而不会造成严重的堆积问题。
        if (count == 3) {
            count = 1;
            throw new AmqpRejectAndDontRequeueException("tried 3 times failed, send to dlq!");
        } else {
            count++;
            throw new RuntimeException("Message consumer failed!");
        }
    }
}

5、消息发送类修改

package com.example.demo.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.messaging.Message;
import org.springframework.messaging.SubscribableChannel;
import org.springframework.messaging.support.MessageBuilder;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class TestController {
    @GetMapping("/test")
    public String echo() {
        return "22";
    }

    @GetMapping("/index")
    public String index() {
        return "3333";
    }

    @Autowired
    private TestTopic testTopic;



    @GetMapping("/sendMsg")
    public String sendMsg() {
        FaceRabbitAddMessage messageVO = new FaceRabbitAddMessage();
        messageVO.setDate("DDDDD");
        testTopic.output().send(MessageBuilder.withPayload(messageVO).setHeader("x-delay", 15000).build());
        return "发送成功";
    }
}