苏州建网站提供电商拿货平台
在接触RammitMQ时，好多文章都说在配置中设置属性
# rabbitmq 配置 rabbitmq:host: xxx.xxx.xxx.xxxport: xxxxusername: xxxpassword: xxxxxx## 生产端配置# 开启发布确认,就是confirm模式. 消费端ack应答后,才将消息从队列中删除#确认消息已发送到队列(Queue)publisher-returns: true#确认消息已发送到交换机(Exchange)publisher-confirm-type: correlatedlistener: #消费者 端配置retry:enabled: true # 是否支持重试default-requeue-rejected: falsemax-attempts: 5 #最大重试次数initial-interval: 3000 # 重试时间间隔direct:acknowledge-mode: manualsimple:acknowledge-mode: manual
消息接收消息失败时，可以重复调用5次；按照此操作，发现没有重复调用。
----------------------------------正确思路---------------------------------------------------------------------------------
设置完配置文件属性后，在代码中利用redis与channel.basicNack联合使用，将错误记录保存至数据库，方便查找原因；
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package com.charg.listener;import com.charg.common.constant.CacheConstants;
import com.charg.common.constant.Constants;
import com.charg.common.utils.JsonUtils;
import com.charg.common.utils.redis.RedisUtils;
import com.charg.constant.RabbitConstants;
import com.charg.product.domain.bo.ProductDeviceBo;
import com.charg.product.domain.bo.RabMsgLogBo;
import com.charg.product.service.IProductDeviceService;
import com.charg.product.service.IRabMsgLogService;
import com.rabbitmq.client.Channel;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;import java.io.IOException;
import java.time.Duration;/*** rabbitmq 监听*/
@Slf4j
@Component
public class RabbitQueueListener {/*** 最大重试次数*/private static int maxReconsumeCount = 3;@Autowiredprivate StringRedisTemplate redisTemplate;/*** 监听 队列的处理器** @param message*/@RabbitListener(queues = "队列名称")@RabbitHandlerpublic void onMessage(Message message, Channel channel) {//唯一标识String messageId = message.getMessageProperties().getMessageId();try {//判断messageId在redis中是否存在if (verificationMessageId(messageId)) {log.error("消息已重复处理,拒绝再次接收...");// 拒绝消息channel.basicReject(message.getMessageProperties().getDeliveryTag(), false);} else {//不存在 则处理消息// 接收消息if (StringUtils.isNotBlank(new String(message.getBody()))) {//修改业务逻辑if (!false) {log.error("消息即将再次返回队列处理...逻辑错误");// 处理最大回调次数getMaximumNumber(message, channel);} else {channel.basicAck(message.getMessageProperties().getDeliveryTag(), false);//加入缓存addMessageId(message);}} else {log.info("消息为空拒绝接收...");// 拒绝消息channel.basicReject(message.getMessageProperties().getDeliveryTag(), false);}}} catch (Exception e) {e.printStackTrace();try {if (message.getMessageProperties().getRedelivered()) {log.error("消息已重复处理,拒绝再次接收----...");// 拒绝消息channel.basicReject(message.getMessageProperties().getDeliveryTag(), false);} else {log.error("消息即将再次返回队列处理...");// 处理最大回调次数getMaximumNumber(message, channel);}} catch (Exception exception) {exception.printStackTrace();}}}/*** 记录消息最大次数** @param message* @param channel* @throws IOException*/private void getMaximumNumber(Message message, Channel channel) {try {int recounsumeCounts = RedisUtils.getCacheObject("messageMaxKey"+message.getMessageProperties().getMessageId()) == null ? 0 : RedisUtils.getCacheObject("messageMaxKey"+message.getMessageProperties().getMessageId());if (maxReconsumeCount > recounsumeCounts) {log.info("maxMessageId(message.getMessageProperties().getMessageId())=" + recounsumeCounts);channel.basicNack(message.getMessageProperties().getDeliveryTag(), false, true);// 记录重试次数maxMessageId(message.getMessageProperties().getMessageId());} else {log.info("次数达到三次了呢---------" + RedisUtils.getCacheObject(CacheConstants.MESSAGE_MAX_KEY + message.getMessageProperties().getMessageId()));// 将消息重新放回队列channel.basicNack(message.getMessageProperties().getDeliveryTag(), false, false);// 清除缓存RedisUtils.deleteObject("messageMaxKey" + message.getMessageProperties().getMessageId());//重试三次后，还是失败 需记录到数据库addRabMsgLog(message);}} catch (Exception e) {e.printStackTrace();}}/*** 设置消息的最大重试次数*/public void maxMessageId(String messageId) {String messageMax ="messageMaxKey"+ messageId;// 存入缓存，用来记录该消息重试了几次if (RedisUtils.hasKey(messageMax)) {RedisUtils.incrAtomicValue(messageMax);} else {//错误的消息-插入数据库RedisUtils.setCacheObject(messageMax, 1, Duration.ofHours(Constants.MESSAGE_TIME));}}/*** 校验消息是否消费过该消息** @param messageId 消息id* @return*/public boolean verificationMessageId(String messageId) {// 消息是否存在keyString verifyIsExistKey ="messageExistKey" + messageId;if ((RedisUtils.hasKey(verifyIsExistKey))) {return true;}return false;}/*** 保存消费过消息** @param message 消息* @return*/public void addMessageId(Message message) {// 存入缓存RedisUtils.setCacheObject("messageExistKey" + message.getMessageProperties().getMessageId(), message.getMessageProperties().getMessageId(), 1);}/*** 消息队列 失败日志 操作* 自己存数据库逻辑*/public void addRabMsgLog(Message message) {log.info("====操作日志===");//将内容记录到数据库}}
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