基于SpringBoot开发的微信点餐系统

package cn.chenhaoxiang.service.impl; import cn.chenhaoxiang.converter.OrderMaster2OrderDTOConverter; import cn.chenhaoxiang.dao.OrderDetailDao; import cn.chenhaoxiang.dao.OrderMasterDao; import cn.chenhaoxiang.dataObject.OrderDetail; import cn.chenhaoxiang.dataObject.OrderMaster; import cn.chenhaoxiang.dataObject.ProductInfo; import cn.chenhaoxiang.dto.CartDTO; import cn.chenhaoxiang.dto.OrderDTO; import cn.chenhaoxiang.enums.OrderStausEnum; import cn.chenhaoxiang.enums.PayStatusEnum; import cn.chenhaoxiang.enums.ResultEnum; import cn.chenhaoxiang.exception.ResponseBankException; import cn.chenhaoxiang.exception.SellException; import cn.chenhaoxiang.service.*; import cn.chenhaoxiang.utils.KeyUtil; import lombok.extern.slf4j.Slf4j; import org.springframework.beans.BeanUtils; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.data.domain.Page; import org.springframework.data.domain.PageImpl; import org.springframework.data.domain.Pageable; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional; import org.springframework.util.CollectionUtils; import java.math.BigDecimal; import java.math.BigInteger; import java.util.ArrayList; import java.util.List; import java.util.stream.Collectors; /** * Created with IntelliJ IDEA. * User: 陈浩翔. * Date: 2018/1/14. * Time: 下午 10:39. * Explain: */ @Service @Slf4j public class OrderServiceImpl implements OrderService { @Autowired private ProductInfoService productInfoService; @Autowired private OrderDetailDao orderDetailDao; @Autowired private OrderMasterDao orderMasterDao; @Autowired private PayService payService; @Autowired private PushMessageService pushMessageService; @Autowired private WebSocket webSocket; @Override @Transactional public OrderDTO create(OrderDTO orderDTO) { String orderId = KeyUtil.getUniqueKey(); BigDecimal orderAmount = new BigDecimal(BigInteger.ZERO); // List<CartDTO> cartDTOList = new ArrayList<>();//方式一 //1.查询商品(数量，价格，库存等) for(OrderDetail orderDetail:orderDTO.getOrderDetailList()){ ProductInfo productInfo = productInfoService.findOne(orderDetail.getProductId()); if(productInfo==null){//商品不存在 throw new SellException(ResultEnum.PRODUCT_NOT_EXIST); // throw new ResponseBankException(ResultEnum.PRODUCT_NOT_EXIST);//修改状态码返回 } //2.计算总价 orderAmount=productInfo.getProductPrice() .multiply(new BigDecimal(orderDetail.getProductQuantity()))//相乘- 计算出一种商品的总价 .add(orderAmount); //订单详情入库 orderDetail.setDetailId(KeyUtil.getUniqueKey()); orderDetail.setOrderId(orderId); //商品图片，名字等 // orderDetail.setProductName(productInfo.getProductName());//不要这样写，要写很多 BeanUtils.copyProperties(productInfo,orderDetail);//拷贝对应的属性值，将productInfo的属性值拷贝到orderDetail ，所以如果有不为null的属性值，记得写在前面 orderDetailDao.save(orderDetail); // CartDTO cartDTO = new CartDTO(orderDetail.getProductId(),orderDetail.getProductQuantity());//方式一 // cartDTOList.add(cartDTO);//方式一 //扣库存放在下面了，不污染这里的代码，请见方式二 } //3.写入订单数据库(orderMaster和orderDetail) OrderMaster orderMaster = new OrderMaster(); orderDTO.setOrderId(orderId); //Spring的对象拷贝函数 - 属性值是null的也会被拷贝进去，所以如果有不为null的属性值，记得写在前面。但是注意，有点默认值也会被写回去 BeanUtils.copyProperties(orderDTO,orderMaster);//将orderDTO拷贝到orderMaster orderMaster.setOrderAmount(orderAmount); //这两个状态值被覆盖为null了，记得写回去 orderMaster.setOrderStatus(OrderStausEnum.NEW.getCode()); orderMaster.setPayStatus(PayStatusEnum.WAIT.getCode()); orderMasterDao.save(orderMaster); //4.扣库存 //方式二 //TODO 在这里，产生高并发的情况下，会出现超卖的情况 - 也就是会出现把库存扣到负数的情况 List<CartDTO> cartDTOList = orderDTO.getOrderDetailList().stream().map(e-> new CartDTO(e.getProductId(),e.getProductQuantity())) .collect(Collectors.toList());//Java8新特性 (java8 lambda) 推荐 productInfoService.decreaseStock(cartDTOList);//判断数量是否够 //发送websocket消息 webSocket.sendMessage(orderDTO.getOrderId()); return orderDTO; } @Override public OrderDTO findOne(String orderId) { OrderMaster orderMaster = orderMasterDao.findOne(orderId); if(orderMaster == null){ throw new SellException(ResultEnum.PRODUCT_NOT_EXIST); } List<OrderDetail> orderDetailList= orderDetailDao.findByOrderId(orderId); if(CollectionUtils.isEmpty(orderDetailList)){//判断orderDetailList为空 throw new SellException(ResultEnum.ORDERDETAIL_NOT_EXIST); } OrderDTO orderDTO = new OrderDTO(); BeanUtils.copyProperties(orderMaster,orderDTO);//拷贝 orderDTO.setOrderDetailList(orderDetailList); return orderDTO; } @Override public Page<OrderDTO> findList(String buyerOpenid, Pageable pageable) { Page<OrderMaster> orderMasterPage = orderMasterDao.findByBuyerOpenid(buyerOpenid,pageable);//这里不需要去查询订单详情 List<OrderDTO> orderDTOList = OrderMaster2OrderDTOConverter.convert(orderMasterPage.getContent()); return new PageImpl<OrderDTO>(orderDTOList,pageable,orderMasterPage.getTotalElements()); } @Override public Page<OrderDTO> findList(Pageable pageable) { Page<OrderMaster> orderMasterPage =orderMasterDao.findAll(pageable);//分页查询 List<OrderDTO> orderDTOList = OrderMaster2OrderDTOConverter.convert(orderMasterPage.getContent()); return new PageImpl<>(orderDTOList,pageable,orderMasterPage.getTotalElements()); } /** * 取消订单 * @param orderDTO * @return */ @Override @Transactional public OrderDTO cancel(OrderDTO orderDTO) { OrderMaster orderMaster = new OrderMaster(); //先判断订单状态 - 只有指定状态下的订单才能取消 if(!orderDTO.getOrderStatus().equals(OrderStausEnum.NEW.getCode())){//不是新下单的订单 log.error("[取消订单] 订单状态不正确，orderId={},orderStatus={}",orderDTO.getOrderId(),orderDTO.getOrderStatus()); throw new SellException(ResultEnum.ORDER_STATUS_ERROR); } //修改订单状态 orderDTO.setOrderStatus(OrderStausEnum.CANCEL.getCode()); //状态修改完再拷贝，否则orderMaster的状态还是没变的 BeanUtils.copyProperties(orderDTO,orderMaster); OrderMaster updateResult = orderMasterDao.save(orderMaster);//进行修改订单状态 if(updateResult == null){ log.error("[取消订单] 更新失败，orderMaster={}",orderMaster); throw new SellException(ResultEnum.ORDER_UPDATE_FAIL); } //返还库存 //先判断有没有商品 if(CollectionUtils.isEmpty(orderDTO.getOrderDetailList())){ log.error("[取消订单] 订单中无商品，orderDTO={}",orderDTO); throw new SellException(ResultEnum.ORDER_DETAIL_EMPTY); } //lambda表达式 List<CartDTO> cartDTOList = orderDTO.getOrderDetailList().stream() .map(e->new CartDTO(e.getProductId(),e.getProductQuantity()))