请问大佬们如何根据用户下单的商家列表中，根据商家id进行订单拆分

Question

后端打印的日志：
[{"id":30
"shopId":1
"goodsQuantity":1
"goodsPrice":43
"goodsName":"qewrr"
"selected":true
"goodsPicture":"http://localhost:8080/goods/showMyGoodsImg-goodsImg-30"}
{"id":40
"shopId":8
"goodsQuantity":1
"goodsPrice":128.55
"goodsName":"眼镜"
"selected":true
"goodsPicture":"http://localhost:8080/goods/showMyGoodsImg-goodsImg-40"}]
userId:1consigneeName:张三orderPrice:171.55orderNo:201904161657316987993

Answer 1

很简单，我回答要是被删了你就是个刷声望的拖

public static void main(String[] args) {
        String json = "[{\"id\":30,\"shopId\":1,orderNo:\"13213132132\"},{\"id\":40,\"shopId\":2,orderNo:\"13213132133\"}," +
                "{\"id\":50,\"shopId\":1,orderNo:\"13213132134\"}]";
        List<Map<String,Object>> list=(List<Map<String, Object>>) JSONObject.parse(json);
        Map<String, List<Map<String,Object>>> newmap=new HashMap<>();
        for (Map<String,Object> oldList : list) {
            String shopId=String.valueOf(oldList.get("shopId"));
            List<Map<String,Object>> m=null;
            if(newmap.containsKey(shopId)){
                m=newmap.get(shopId);
            }else{
                m=new ArrayList<>();
            }
            m.add(oldList);
            newmap.put(shopId,m);
        }
        System.out.println(newmap.toString());
    }