问题苍穹外卖这一块业务是直接拿购物车的快照去结算如果在加入购物车之后的时间商家修改了商品信息会出现问题。以下是苍穹外卖下单业务源代码package com.sky.service.impl; import com.sky.constant.MessageConstant; import com.sky.context.BaseContext; import com.sky.dto.OrdersSubmitDTO; import com.sky.entity.AddressBook; import com.sky.entity.OrderDetail; import com.sky.entity.Orders; import com.sky.entity.ShoppingCart; import com.sky.exception.AddressBookBusinessException; import com.sky.exception.ShoppingCartBusinessException; import com.sky.mapper.AddressBookMapper; import com.sky.mapper.OrderDetailMapper; import com.sky.mapper.OrderMapper; import com.sky.mapper.ShoppingCartMapper; import com.sky.service.OrderService; import com.sky.vo.OrderSubmitVO; import lombok.extern.slf4j.Slf4j; import org.springframework.beans.BeanUtils; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import java.time.LocalDateTime; import java.util.ArrayList; import java.util.List; Service Slf4j public class OrderServiceImpl implements OrderService { Autowired private OrderMapper orderMapper; Autowired private OrderDetailMapper orderDetailMapper; Autowired private AddressBookMapper addressBookMapper; Autowired private ShoppingCartMapper shoppingCartMapper; /** * 用户下单 * param ordersSubmitDTO * return */ Override public OrderSubmitVO submit(OrdersSubmitDTO ordersSubmitDTO) { // 判空地址簿购物车 AddressBook add addressBookMapper.getById(ordersSubmitDTO.getAddressBookId()); if(add null){ throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL); } ShoppingCart shoppingCart new ShoppingCart(); shoppingCart.setUserId(BaseContext.getCurrentId()); ListShoppingCart list shoppingCartMapper.list(shoppingCart); if(list.isEmpty() || list null){ throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL); } // 向订单表插入一条订单数据 Orders orders new Orders(); BeanUtils.copyProperties(ordersSubmitDTO,orders); orders.setOrderTime(LocalDateTime.now()); orders.setPayStatus(Orders.UN_PAID); orders.setStatus(Orders.PENDING_PAYMENT); orders.setNumber(String.valueOf(System.currentTimeMillis())); orders.setPhone(add.getPhone()); orders.setConsignee(add.getConsignee()); orders.setUserId(BaseContext.getCurrentId()); orderMapper.insert(orders); // 向订单明细表批量插入多条数据 ListOrderDetail detailList new ArrayList(); for (ShoppingCart cart : list) { OrderDetail orderDetail new OrderDetail(); BeanUtils.copyProperties(cart,orderDetail); orderDetail.setOrderId(orders.getId()); detailList.add(orderDetail); } orderDetailMapper.insertBatch(detailList); // 清空购物车 shoppingCartMapper.clearByUserId(BaseContext.getCurrentId()); // 返回VO OrderSubmitVO orderSubmitVO OrderSubmitVO.builder() .id(orders.getId()) .orderNumber(orders.getNumber()) .orderAmount(orders.getAmount()) .orderTime(orders.getOrderTime()) .build(); return orderSubmitVO; } }解决方法如果商家修改商品信息后直接更改购物车信息会涉及多表查询而且如果用户量大的话处理起来非常的麻烦那么争对苍穹外卖这个模块可以在结算的时候再做一次校验for (ShoppingCart cartItem : shoppingCartList) { // 1. 查最新的菜品/套餐数据 Dish dish dishMapper.getById(cartItem.getDishId()); // 2. 检查是否还在售 if (dish.getStatus() 0) { throw new OrderBusinessException(dish.getName() 已下架); } // 3. 检查价格是否变动 if (!dish.getPrice().equals(cartItem.getAmount())) { // 直接抛异常提示用户刷新购物车 throw new OrderBusinessException(dish.getName() 价格有变动请重新确认); } }