字符串切分，stream，JSONObject，lambda表达式的应用

需求：把state字段对应数据切分，获取第一个数字作为状态，0代表离线，1代表在线
下面是返回的数据，其中state的数据不是我们想要的：

{
    
    
    "status": "200",
    "message": "success",
    "error": null,
    "path": null,
    "timestamp": "2021-06-01 13:39:31",
    "data": [
        {
    
    
            "dateTime": null,
            "lng": "0E-12",
            "detailId": "13011000010010886016",
            "state": "01",
            "describe": "13011000010010886016",
            "title": "北门人行出口14",
            "lat": "0E-12"
        },
        {
    
    
            "dateTime": null,
            "lng": "0E-12",
            "detailId": "13011000010010886017",
            "state": "10",
            "describe": "13011000010010886017",
            "title": "西门人行进口12",
            "lat": "0E-12"
        }]
        }

controller层的处理：

 @GetMapping("/video/list")
    @ApiOperation("视频图层列表")
    public Result getVideoList(){
    
    
        LayerQo qo = new LayerQo();
        // layerId=1代表视频图层
        qo.setLayerId(LayerEnum.VEDIO_LAYER.getLayerId());
        //将state的12->1  截取第一位数字，作为状态
        List<JSONObject> list = ((List<Object>)iPublicFeignClientService.getVedioLayerPost(qo).getData()).stream().map(obj ->{
    
    
            JSONObject json = (JSONObject) JSONObject.toJSON(obj);
            json.put("state",json.getString("state").substring(0,1));
            return json;
        }).collect(Collectors.toList());
        return GovernResult.ok(list);
    }

然后，返回的数据为：

{
    
    
    "status": "200",
    "message": "success",
    "error": null,
    "path": null,
    "timestamp": "2021-06-01 13:39:31",
    "data": [
        {
    
    
            "dateTime": null,
            "lng": "0E-12",
            "detailId": "13011000010010886016",
            "state": "0",
            "describe": "13011000010010886016",
            "title": "北门人行出口14",
            "lat": "0E-12"
        },
        {
    
    
            "dateTime": null,
            "lng": "0E-12",
            "detailId": "13011000010010886017",
            "state": "1",
            "describe": "13011000010010886017",
            "title": "西门人行进口12",
            "lat": "0E-12"
        }]
        }

记录一下搞了很久的代码，知识点：
字符串切分，stream，JSONObject的应用