黑马点评用rabbitmq实现优惠券秒杀下单后的异步操作数据库数据

导入配置

		<dependency>		 			<groupId>org.springframework.boot</groupId> 			<artifactId>spring-boot-starter-amqp</artifactId> 			<version>2.7.7</version> 		</dependency> 

配置文件配置

JavaConfig配置

@Component @Slf4j public class RabbitmqConfig implements InitializingBean {     @Resource     private RabbitTemplate rabbitTemplate;      @Override     public void afterPropertiesSet() throws Exception {         log.info("初始化配置rabbitmq配置");  //        rabbitTemplate.setMessageConverter(new Jackson2JsonMessageConverter(new ObjectMapper()));         rabbitTemplate.setConfirmCallback(new RabbitTemplate.ConfirmCallback() {             @Override             public void confirm(CorrelationData correlationData, boolean b, String s) {                 if(!b)                 {                     log.error("发送消息到mq失败,原因:{}",s);                 }             }         });         rabbitTemplate.setReturnCallback(new RabbitTemplate.ReturnCallback() {             @Override             public void returnedMessage(Message message, int replyCode, String replyText, String exchange, String routingKey) {                 log.error("消息返回回调触发,交换机:{},路由:{},消息内容:{},原因:{}",exchange,routingKey,message,replyText);             }         });     } } 

通过@Bean注入MessageConverter,保证消息的正确传输

    @Bean     public MessageConverter jsonMessageConverter(ObjectMapper objectMapper) {         return new Jackson2JsonMessageConverter(objectMapper);     } 

修改后的代码

    @Override     //关于事务注解     public Result seckillVoucher(Long voucherId) { //        1,执行lua脚本,lua脚本用于判断库存是否充足,扣库存操作         Long userId=UserHolder.getUser().getId();         long orderId=redisIDworker.nextId("order");          //执行此操作前保证,用户查看优惠券的请求,和添加优惠券时 已经将秒杀优惠圈的库存数量添加到了redis中         Long result=stringRedisTemplate.execute(                 SECKILL_SCRIPT,                 Collections.emptyList(),                 voucherId.toString(),                 userId.toString(),                 String.valueOf(orderId)         );         //获取lua脚本返回值         int r=result.intValue();         if(r!=0)         {             return Result.fail(r==1?"库存不足":"不能重复下单");         } //        //获取代理对象 //        IVoucherOrderService proxy= (IVoucherOrderService) AopContext.currentProxy();         //异步写数据库         VoucherOrder voucherOrder = new VoucherOrder();         voucherOrder.setId(orderId);         voucherOrder.setUserId(userId);         voucherOrder.setVoucherId(voucherId);         rabbitTemplate.convertAndSend(SaveVoucherConstants.SECKILL_VOUCHER_SAVE_QUEUE,voucherOrder);         log.info("发送保存秒杀券订单信息成功:{}",orderId);         return Result.ok("seckSuccess");     } 

监听器

@Component @Slf4j public class AsyncSaveVoucherListener {     @Resource     private IVoucherOrderService voucherOrderService;     @Resource     private ISeckillVoucherService seckillVoucherService;     @RabbitListener(queuesToDeclare = {@Queue(name= SaveVoucherConstants.SECKILL_VOUCHER_SAVE_QUEUE)})     public void AsyncSave(VoucherOrder voucherOrder)     {         log.info("接收到存储订单信息的消息,{}", JSON.toJSON(voucherOrder).toString());         boolean success = seckillVoucherService.update().setSql("stock=stock-1").eq("voucher_id", voucherOrder.getVoucherId()).gt("stock", 0).update();         voucherOrderService.save(voucherOrder);         log.info("订单信息存储完成?{}",success);     } }