rabbitmq消息发送的可靠性：结合mysql来保证消息投递的可靠性

消息从生产者到Broker，则会触发confirmCallBack回调
消息从exchange到Queue，投递失败则会调用returnCallBack

用一张表来记录发送到mq的每一条消息，方便发送失败需要重试。status： 1-正常，0-重试，2-失败。
发送消息前，保存消息，并设置status为0和设置重试时间TryTime。
发送消息后：

如果回调方法confirm接收到为true---表示发送成功，拿到msgId，修改数据库中status为1，表示消息投递成功。
如果回调方法confirm接收到为false---失败不做任何操作，此时消息状态status还是0，而0表示重试的状态。

4. 设置一个定时任务：10秒执行一次. 根据（status）状态0并且重试时间（try_time）< sysdate()当前时间查询出List<RabbitmqSendLog> rabbitmqSendLogs消息的数量rabbitmqSendLogs

5.遍历所有消息rabbitmqSendLogs.forEach

如果重试次数count>=3，则直接设置这条消息发送失败status=2
如果重试次数count<3, 则根据message_id和获取当前时间更新date来更新这条消息重试次数count+1；
获取消息体content，并讲获取到的json字符串解析成对象，然后通过rabbitTemplate把对象投递到rabbitmq

数据表rabbitmq_send_log

对应的实体类

@Data
@TableName("rabbitmq_send_log")
public class RabbitmqSendLog {
//    @TableId(type = IdType.AUTO)
    private String messageId;
    private String content;
    private Integer status;
    private String routeKey;
    private String exchange;
    private Integer count;
    private Date tryTime;
    @TableField(fill = FieldFill.INSERT)
    private Date createTime;
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private Date updateTime;
}

server:
  port: 8071

spring:
  rabbitmq:
    host: localhost
    port: 5672
    username: admin
    password: 123456
    virtual-host: /ems
    template:
      retry: #重试，消息发送失败会重试
        enabled: true # 开启重试
        initial-interval: 10000ms  #第一次十秒重试
        max-interval: 80000ms  #最后一次是八秒重试
        multiplier: 2  #重试翻倍率
    publisher-confirms: true #发送者开启 confirm 确认机制
    publisher-returns: true  # 发送者开启 return 确认机制

  datasource:
    url: jdbc:mysql://localhost:3306/one?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&AllowPublicKeyRetrieval=True
    username: root
    password: root


mybatis-plus:
  mapper-locations: classpath*:com/test/mapper/xml/*.xml
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
    map-underscore-to-camel-case: true
  type-aliases-package: com.test.domain

配置类

package com.test.config;


import com.test.mapper.RabbitmqSendLogMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.amqp.rabbit.connection.CorrelationData;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.amqp.support.converter.Jackson2JsonMessageConverter;
import org.springframework.amqp.support.converter.MessageConverter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.annotation.PostConstruct;
import javax.annotation.Resource;

@Slf4j
@Configuration
public class RabbitCallbackConfig implements RabbitTemplate.ConfirmCallback, RabbitTemplate.ReturnCallback {
    @Resource
    private RabbitmqSendLogMapper rabbitmqSendLogMapper;

    @Bean
    RabbitTemplate rabbitTemplate(ConnectionFactory connectionFactory) {
        RabbitTemplate rabbitTemplate = new RabbitTemplate(connectionFactory);
        //rabbitTemplate发送消息json转换配置
        rabbitTemplate.setMessageConverter(new Jackson2JsonMessageConverter());
        rabbitTemplate.setMandatory(true);
        rabbitTemplate.setConfirmCallback(this);
        rabbitTemplate.setReturnCallback(this);
        return rabbitTemplate;
    }

    /**
     * 配置接收消息json转换为对象
     *
     * @return
     */
    @Bean
    public MessageConverter jsonMessageConverter() {
        return new Jackson2JsonMessageConverter();
    }

    // 下边这样写也可以
    // @Autowired
    // private RabbitTemplate rabbitTemplate;
    // @PostConstruct
    // public void init() {
    //     rabbitTemplate.setMandatory(true);
    //     rabbitTemplate.setReturnCallback(this);
    //     rabbitTemplate.setConfirmCallback(this);
    // }
//消息从生产者到Broker，则会触发confirmCallBack回调
    @Override
    public void confirm(CorrelationData correlationData, boolean ack, String cause) {
        if (!ack) {
            log.error("confirm==>发送到broker.exchange失败\r\n" +
                            "correlationData={}\r\n" + "ack={}\r\n" + "cause={}",
                    correlationData, ack, cause);
        } else {
            log.info("confirm==>发送到broker.exchange成功\r\n" +
                            "correlationData={}\r\n" + "ack={}\r\n" + "cause={}",
                    correlationData, ack, cause);
            String msgId = correlationData.getId();
            Integer status = 1;
            //拿到msgId，修改数据库中status为1，表示消息投递成功
            rabbitmqSendLogMapper.updateRabbitmqSendLogStatus(msgId, status);
            //update rabbitmq_send_log set status = #{status} where message_id=#{msg}
            System.out.println("消息投递成功->msgId: " + msgId);

        }
    }

    //消息从exchange到Queue，投递失败则会调用returnCallBack
    @Override
    public void returnedMessage(Message message, int replyCode, String replyText,
                                String exchange, String routingKey) {
        log.info("returnedMessage==> \r\n" + "message={}\r\n" + "replyCode={}\r\n" +
                        "replyText={}\r\n" + "exchange={}\r\n" + "routingKey={}",
                message, replyCode, replyText, exchange, routingKey);
    }
}

定时任务，每隔10秒冲数据库查询，然后再从新投递到mq。

package com.test.task;

import com.alibaba.fastjson.JSON;
import com.test.domain.RabbitmqSendLog;
import com.test.domain.Student;
import com.test.mapper.RabbitmqSendLogMapper;
import org.springframework.amqp.rabbit.connection.CorrelationData;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;
import java.util.Date;
import java.util.List;

/**
 * Created by IntelliJ IDEA.
 *
 * @Author : Yang Kai
 * @create 2022/12/21 15:43
 */
@Component
@EnableScheduling
public class RabbitSendTask {
    @Resource
    private RabbitmqSendLogMapper rabbitmqSendLogMapper;
    @Autowired
    private RabbitTemplate rabbitTemplate;

    //每隔十秒执行一次
    @Scheduled(cron = "0/10 * * * * ?")
    public void messageSendTask() {
        //select * from rabbitmq_send_log where status=0 and try_time &lt; sysdate()
        List<RabbitmqSendLog> rabbitmqSendLogs = rabbitmqSendLogMapper.getMsgStatus();
        rabbitmqSendLogs.forEach(s->{
            //3表示：如果重试次数大于或等于3
            if (s.getCount()>=3){
                //update rabbitmq_send_log set status = #{status} where message_id=#{msgId}
                rabbitmqSendLogMapper.updateRabbitmqSendLogStatus(s.getMessageId(),2);//直接设置这条消息发送失败
            }else {
                System.out.println("重试消息:  "+s);
                //更新重试消息的次数
                //update rabbitmq_send_log set count=count+1,update_time=#{date} where message_id=#{messageId}
                rabbitmqSendLogMapper.updateCount(s.getMessageId(),new Date());
                //拿到重试消息的json消息体,把json转换为消息对象
                Student student = JSON.parseObject(s.getContent(), Student.class);
                //投递消息
                rabbitTemplate.convertAndSend(s.getExchange(),s.getRouteKey(),student,new CorrelationData(s.getMessageId()));
            }
        });
    }
}

接收rabbitmq消息的类

package com.test.service;

import com.rabbitmq.client.Channel;
import com.test.domain.Student;
import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessageBuilder;
import org.springframework.amqp.rabbit.annotation.Exchange;
import org.springframework.amqp.rabbit.annotation.Queue;
import org.springframework.amqp.rabbit.annotation.QueueBinding;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.support.AmqpHeaders;
import org.springframework.amqp.support.converter.Jackson2JsonMessageConverter;
import org.springframework.amqp.support.converter.MessageConverter;
import org.springframework.context.annotation.Bean;
import org.springframework.messaging.handler.annotation.Header;
import org.springframework.stereotype.Component;

import java.io.IOException;

@Slf4j
@Component
public class WorkCustomer {


    @RabbitListener(bindings = {
            @QueueBinding(
                    value = @Queue(value = "queue.name.user", declare = "true"), // 创建info队列,declare默认队列持久化
                    key = {"route.user"}, // 路由key
                    exchange = @Exchange(type = "direct", name = "exchange-directs-user")
            )})
    public void receive12211(Student student, Channel channel, @Header(AmqpHeaders.DELIVERY_TAG) long deliveryTag) {
        System.out.println("路由模式message1 = " + student);
    }


}

发送消息

  @Test
    public void contextLoadsx() {
        String msgId = UUID.randomUUID().toString();
        System.out.println("1msgId:"+msgId);
        RabbitmqSendLog rabbitmqSendLog = new RabbitmqSendLog();
        rabbitmqSendLog.setMessageId(msgId);
        rabbitmqSendLog.setExchange("exchange-directs-user");
        rabbitmqSendLog.setRouteKey("route.user");
        rabbitmqSendLog.setCount(1);
        rabbitmqSendLog.setStatus(0);
        //1分钟后重试的时间
        rabbitmqSendLog.setTryTime(new Date(System.currentTimeMillis()+1000+60+1));
        Student student = new Student();
        student.setAddress("上海");
        student.setAge("12");
        student.setName("小明");
        String s = JSON.toJSONString(student);
        rabbitmqSendLog.setContent(s);
        int insert = rabbitmqSendLogMapper.insert(rabbitmqSendLog);
        try {
            rabbitTemplate.convertAndSend("exchange-directs-user", "route.user", student,new CorrelationData(msgId));
        }catch (Exception e){
            //如果mq网络原因.发送邮件,活着其他方式通知
//            rabbitmqSendLogMapper.insert(rabbitmqSendLog);
        }
        
    }