Redis购物车

个人商城系统，后台对购物车数据进行“半持久化”。

因为购物车增删改的操作很频繁，如果使用mysql效率会很低，

所以使用redis进行存储。如果担心redis会挂，可使用redis集群，还是很靠谱的

配置文件和redis连接池

参考上一篇redis进行缓存

购物车redis缓存设置:

CartPrefix.class

public class CartPrefix extends BasePrefix{       public CartPrefix(int expireSeconds, String prefix) {           super(expireSeconds, prefix);    }    /**     * 设置购物车缓存     */    public static CartPrefix getCartList= new CartPrefix(0,"cart");}

购物车service层代码：

CartService.class

@Service@Slf4jpublic class CartServiceImpl implements CartService {       @Autowired    RedisService redisService;    @Autowired    ProductInfoDao productInfoDao;    @Override    public int addCart(String userId, String productId, int num) {           //key为 userId_cart,校验是否已存在        Boolean exists = redisService.existsValue(CartPrefix.getCartList,userId,productId);        if (exists){               //获取现有的购物车中的数据            String json = redisService.hget(CartPrefix.getCartList,userId,productId);            if (json !=null){                   //转换为java实体类                CartDto cartDto = JSON.toJavaObject(JSONObject.parseObject(json),CartDto.class);                cartDto.setProductNum(cartDto.getProductNum()+num);                redisService.hset(CartPrefix.getCartList,userId,productId,JSON.toJSON(cartDto).toString());            }else {                   return 0;            }            return 1;        }        //根据商品id获取商品        ProductInfo productInfo = productInfoDao.findProductById(productId);        if (productInfo==null){               return 0;        }        //设置购物车值        CartDto cartDto = new CartDto();        cartDto.setProductId(productId);        cartDto.setProductName(productInfo.getProductName());        cartDto.setProductIcon(productInfo.getProductIcon());        cartDto.setProductPrice(productInfo.getProductPrice());        cartDto.setProductStatus(productInfo.getProductStatus());        cartDto.setProductNum(num);        cartDto.setCheck("1");        redisService.hset(CartPrefix.getCartList,userId,productId,JSON.toJSON(cartDto).toString());        return 1;    }    /**     * 展示购物车     * @param userId     * @return     */    @Override    public List
   
     getCartList(String userId) {           List
    
      jsonList = redisService.hvals(CartPrefix.getCartList,userId);        List
     
       cartDtoList = new LinkedList<>();        for (String json:jsonList){               CartDto cartDto = JSON.toJavaObject(JSONObject.parseObject(json),CartDto.class);            cartDtoList.add(cartDto);        }        return cartDtoList;    }    /**     * 更新数量     * @param userId     * @param productId     * @param num     * @return     */    @Override    public int updateCartNum(String userId, String productId, int num) {           String json = redisService.hget(CartPrefix.getCartList,userId,productId);        if (json==null){               return 0;        }        CartDto cartDto = JSON.toJavaObject(JSONObject.parseObject(json),CartDto.class);        cartDto.setProductNum(num);        redisService.hset(CartPrefix.getCartList,userId,productId,JSON.toJSON(cartDto).toString());        return 1;    }    /**     * 全选商品     * @param userId     * @param checked     * @return     */    @Override    public int checkAll(String userId, String checked) {           //获取商品列表        List
      
        jsonList = redisService.hvals(CartPrefix.getCartList,userId);        for (String json:jsonList){               CartDto cartDto = JSON.toJavaObject(JSONObject.parseObject(json),CartDto.class);            if ("true".equals(checked)){                   cartDto.setCheck("1");            }else if ("false".equals(checked)){                   cartDto.setCheck("0");            }else {                   return 0;            }            redisService.hset(CartPrefix.getCartList,userId,cartDto.getProductId(),JSON.toJSON(cartDto).toString());        }        return 1;    }    /**     * 删除商品     * @param userId     * @param productId     * @return     */    @Override    public int delCartProduct(String userId, String productId) {           redisService.hdel(CartPrefix.getCartList,userId,productId);        return 1;    }    /**     * 清空购物车     * @param userId     * @return     */    @Override    public int delCart(String userId) {           redisService.delete(CartPrefix.getCartList,userId);        return 1;    }}

购物车接口实现：

CartController.class

@RestController@RequestMapping("/cart")@Slf4jpublic class CartController {       @Autowired    CartService cartService;    /**     * 加入购物车     * @param reqMap     * @param user     * @return     */    @PostMapping(value = "/add")    @Autorization    public Object addCart(@RequestBody Map
   
     reqMap, @CurrentUser User user){           //获取登陆用户的userId        String userId = RequestUtil.getMapString(user.getId());        String productId = RequestUtil.getMapString(reqMap.get("product_id").toString());        String numString = RequestUtil.getMapString(reqMap.get("product_num").toString());        Integer num = Integer.parseInt(numString);        //加入购物车        int effectNum = cartService.addCart(userId,productId,num);        if (effectNum<=0){               return ResultUtil.fail(ResultEnum.ADD_CART_ERROR);        }        return ResultUtil.ok(ResultEnum.ADD_CART_SUCCESS.getMessage());    }    @GetMapping(value = "/getCartList")    @Autorization    public Object getCartList(@CurrentUser User user){           String userId = RequestUtil.getMapString(user.getId());        List
    
      cartDtoList = cartService.getCartList(userId);        return ResultUtil.ok(cartDtoList);    }    @PostMapping(value = "/updateCartNum")    @Autorization    public Object updateCartNum(@RequestBody Map
     
       reqMap,@CurrentUser User user){           String userId = RequestUtil.getMapString(user.getId());        String productId = RequestUtil.getMapString(reqMap.get("product_id").toString());        String numString = RequestUtil.getMapString(reqMap.get("product_num").toString());        Integer num = Integer.parseInt(numString);        int effectNum = cartService.updateCartNum(userId,productId,num);        if (effectNum <=0){               return ResultUtil.fail();        }        return ResultUtil.ok();    }    @PostMapping(value = "/checkAll")    @Autorization    public Object checkAll(@RequestBody Map
      
        reqMap,@CurrentUser User user){           String userId = RequestUtil.getMapString(user.getId());        String check = RequestUtil.getMapString(reqMap.get("check").toString());        int effectNum = cartService.checkAll(userId,check);        if (effectNum <=0){               return ResultUtil.fail();        }        return ResultUtil.ok();    }    @PostMapping("/delCartProduct")    @Autorization    public Object delCartProduct(@RequestBody Map
       
         reqMap,@CurrentUser User user){           String userId = RequestUtil.getMapString(user.getId());        String productId = RequestUtil.getMapString(reqMap.get("product_id").toString());        int effectNum = cartService.delCartProduct(userId,productId);        if (effectNum <=0){               return ResultUtil.fail();        }        return ResultUtil.ok();    }    @PostMapping("/delCart")    @Autorization    public Object delCart(@CurrentUser User user){           String userId = RequestUtil.getMapString(user.getId());        int effectNum = cartService.delCart(userId);        if (effectNum <=0){               return ResultUtil.fail();        }        return ResultUtil.ok();    }}