redis实现秒杀下单的业务逻辑

业务逻辑：

具体代码：

package com.hmdp.service.impl;import com.hmdp.dto.Result;
import com.hmdp.entity.SeckillVoucher;
import com.hmdp.entity.VoucherOrder;
import com.hmdp.mapper.VoucherOrderMapper;
import com.hmdp.service.ISeckillVoucherService;
import com.hmdp.service.IVoucherOrderService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisIdWorker;
import com.hmdp.utils.UserHolder;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;import javax.annotation.Resource;
import java.time.LocalDateTime;/*** <p>*  服务实现类* </p>** @author ztn* @since 2025-09-23*/
@Service
public class VoucherOrderServiceImpl extends ServiceImpl<VoucherOrderMapper, VoucherOrder> implements IVoucherOrderService {@Resourceprivate ISeckillVoucherService seckillVoucherService;@Resourceprivate RedisIdWorker redisIdWorker;@Override@Transactionalpublic Result seckillVocher(Long voucherId) {// 1.查询优惠券SeckillVoucher voucher = seckillVoucherService.getById(voucherId);// 2.判断秒杀是否开始if(voucher.getBeginTime().isAfter(LocalDateTime.now())){return Result.fail("秒杀尚未开始");}// 3.判断秒杀是否结束if(voucher.getEndTime().isBefore(LocalDateTime.now())){return Result.fail("秒杀已经结束");}// 4.判断库是否充足if(voucher.getStock() < 1){return Result.fail("库存不足");}// 5.扣减库存boolean success = seckillVoucherService.update().setSql("stock = stock - 1").eq("voucher_id", voucherId).update();if(!success){return Result.fail("库存不足");}// 6.创建订单vVoucherOrder voucherOrder = new VoucherOrder();// 6.1订单idlong orderId = redisIdWorker.nextId("order");voucherOrder.setId(orderId);// 6.2用户idLong userId = UserHolder.getUser().getId();voucherOrder.setUserId(userId);// 6.3代金券idvoucherOrder.setVoucherId(voucherId);save(voucherOrder);// 7.返回订单idreturn Result.ok(orderId);}
}