SpringBoot实现物品收藏功能

@Override
    public int addGoodsInCar(@RequestBody JSONObject sums) {
        String openid = sums.getString("openid");
        JSONArray gid = sums.getJSONArray("gid");
        if (openid==null||gid==null){
            return 0;
        }
        JSONArray  gidf = (JSONArray)gid.clone();//深拷贝
        ArrayList<Integer> integers = shoppingCarMapper.selectByOpenid(openid);
        int a = 1;
        if (integers.size()==0 ){
            ShoppingCar car = new ShoppingCar();
            car.setOpenid(openid);
            car.setGid(gid.getInteger(0));
            a = shoppingCarMapper.insert(car);
        }
        if (!integers.isEmpty()){
            //去重

                Iterator<Object> it = gid.iterator();
                while(it.hasNext()){
                    Integer gid1 =(Integer) it.next();

                    integers.forEach(item -> {
                        if(item == gid1){
                            it.remove();
                        }
                    });
                }

                Iterator<Object> it1 = gid.iterator();

                while (it1.hasNext() && a==1){
                    int next = (int)it1.next();
                    ShoppingCar car = new ShoppingCar();
                    car.setOpenid(openid);
                    car.setGid(next);
                    a = shoppingCarMapper.insert(car);
                }

                Iterator<Integer> integers0 = integers.iterator();

                while(integers0.hasNext()){
                    Integer gid1 =integers0.next();
                    gidf.forEach(item -> {
                        if(item == gid1){
                            integers0.remove();
                        }
                    });
                }
                Iterator<Integer> iterator2 = integers.iterator();

                while (iterator2.hasNext() && a==1){
                    int next = iterator2.next();
                    ShoppingCar car = new ShoppingCar();
                    car.setOpenid(openid);
                    car.setGid(next);
                    a = shoppingCarMapper.deleteCar(car);
                }


            if (a==0){
                return 0;
            }else {
                return 1;
            }
        }
       return 0;

    }