购物车业务逻辑
用户添加购物车有两种情况
已登陆:获取用户的用户名,使用用户名作为Key,购物车作为Value存入到Redis未登陆:将购物车放入用户浏览的的cookie中微信小程序用户未登陆拒绝添加购物车添加购物车流程
封装实体类
package com.jin.mall.pojo; import com.fasterxml.jackson.databind.annotation.JsonSerialize; import lombok.Data; @Data @JsonSerialize(include= JsonSerialize.Inclusion.NON_NULL) public class ProductCarInfo { /** * * This field was generated by MyBatis Generator. * This field corresponds to the database column ayy_product_car_info.id * * @mbg.generated */ private Long id; /** * * This field was generated by MyBatis Generator. * This field corresponds to the database column ayy_product_car_info.product_id * * @mbg.generated */ private Integer productId; /** * * This field was generated by MyBatis Generator. * This field corresponds to the database column ayy_product_car_info.product_car * * @mbg.generated */ private Integer productCar; /** * * This field was generated by MyBatis Generator. * This field corresponds to the database column ayy_product_car_info.quantity * * @mbg.generated */ private Integer quantity; /** * * This field was generated by MyBatis Generator. * This field corresponds to the database column ayy_product_car_info.shop_id * * @mbg.generated */ private Integer shopId; /** * * This field was generated by MyBatis Generator. * This field corresponds to the database column ayy_product_car_info.price * * @mbg.generated */ private Double price; /** * * This field was generated by MyBatis Generator. * This field corresponds to the database column ayy_product_car_info.specification * * @mbg.generated */ private String specification; }
自定义封装实体类,商家ID,商家名称,用户ID,购物项
package com.jin.mall.pojo; import lombok.Data; import java.util.List; /* 自定义封装购物车实体类 */ @Data public class BuyerCart { private Integer sellerId; private String sellerName; private Integer userid; private List<ProductCarInfo> carInfoList; }业务层逻辑
微信小程序案例
package com.jin.mall.service; import com.jin.mall.mapper.LeaseMapper; import com.jin.mall.mapper.ProductCarInfoMapper; import com.jin.mall.mapper.UserMerchantMapper; import com.jin.mall.pojo.*; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Repository; import org.springframework.stereotype.Service; import java.util.ArrayList; import java.util.List; @Repository @Service public class LeaseCatService { @Autowired private LeaseMapper leaseMapper; @Autowired private ProductCarInfoMapper infoMapper; @Autowired private UserMerchantMapper merchantMapper; /* 添加购物车 */ public List<BuyerCart> addLeaseCarList(List<BuyerCart> cartlist, Integer id, Integer num){ /*未判断登陆状态*/ LeaseWithBLOBs lease = leaseMapper.selectByPrimaryKey(id); if (lease.getStock()==null&&"".equals(lease.getStock())){ throw new RuntimeException("此商品不存在"); } if (!"1".equals(lease.getStatus())){ throw new RuntimeException("此商品审核未通过,禁止购买"); } Integer sellerId = lease.getShopid(); BuyerCart buyerCart = findBuyerCartShopId(cartlist, sellerId); if (buyerCart==null){ buyerCart = new BuyerCart(); buyerCart.setSellerId(sellerId); ArrayList<ProductCarInfo> list = new ArrayList<>(); ProductCarInfo item = findByOrderItem(lease, num); list.add(item); buyerCart.setCarInfoList(list); cartlist.add(buyerCart); } else { List<ProductCarInfo> carInfoList = buyerCart.getCarInfoList(); ProductCarInfo item = findByOrderItem(carInfoList, id); if (item==null){ item=findByOrderItem(item,num); carInfoList.add(item); }else { item.setQuantity(item.getQuantity()+num); }if (item.getProductCar()<=0){ carInfoList.remove(item); }if (carInfoList.size()<=0){ cartlist.remove(buyerCart); } } return cartlist; } /* 查询此购物车集合有没有这个卖家的购物车对象 */ private BuyerCart findBuyerCartShopId(List<BuyerCart> list,Integer shopId){ if (list!=null){ for (BuyerCart buyerCart : list) { if (buyerCart.getSellerId().equals(shopId)){ return buyerCart; } } } return null; } /* 查询此购物车集合有没有这个商品,存在返回购物项对象 */ private ProductCarInfo FindBuyerCartLease(List<ProductCarInfo> list,Integer leaseId){ if (list!=null){ for (ProductCarInfo carInfo : list) { if (carInfo.getProductId().equals(leaseId)){ return carInfo; } } } return null; } /* 创建购物项对象 */ private ProductCarInfo findByOrderItem(Lease lease, Integer num){ if (num<=0){ throw new RuntimeException("购买数量非法"); } ProductCarInfo carInfo = new ProductCarInfo(); carInfo.setQuantity(num); carInfo.setProductId(lease.getLeaseId()); LeaseWithBLOBs leaseWithBLOBs = leaseMapper.selectByPrimaryKey(lease.getLeaseId()); carInfo.setShopId(lease.getShopid()); carInfo.setPrice(lease.getPrice()); carInfo.setSpecification(leaseWithBLOBs.getSpecificationId()); carInfo.setQuantity(num); carInfo.setProductId(lease.getLeaseId()); return carInfo; } /* 获取购物车列表对象 */ public List<BuyerCart> getLeaseCar(Integer uid) { List<BuyerCart> list = (List<BuyerCart>) infoMapper.selectByPrimaryKey(uid); if (list.size() <= 0) { throw new RuntimeException("未添加商品至购物车"); } return list; } }表现层
package com.jin.mall.control; import com.jin.mall.pojo.BuyerCart; import com.jin.mall.pojo.Result; import com.jin.mall.service.LeaseCatService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.CrossOrigin; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import java.util.List; @RestController @CrossOrigin(origins = "*",maxAge = 3600) public class LeaseCatControl { @Autowired private LeaseCatService leaseCatService; /* 添加商品到购物车 */ @RequestMapping("addGoodsToCartList") public Result addGoodsToCartList(Integer uid,Integer leaseId,Integer num){ try { List<BuyerCart> list = findCartList(uid); list = leaseCatService.addLeaseCarList(list, leaseId, num); return new Result(true,"添加成功"); } catch (Exception e) { e.printStackTrace(); return new Result(false,"添加失败"); } } /* 获取购物车数据 */ @GetMapping("findCartList") public List<BuyerCart> findCartList(Integer uid){ // 判断用户是否登陆,未登陆禁止添加访问购物车 // 已登陆,返回购物车列表对象 return leaseCatService.getLeaseCar(uid); } }
