如何在flutter中检索嵌套的json数组？

Question

这是我的 JSON 数据：

{ 
   "result":"0",
   "school_code":"School Code",
   "dashboard":{ 
      "resultPrivilege":"0",
      "privilege":[ 
         { 
            "activity_id":"activity_id",
            "privilege_id":"privilege_id"
         }
      ]
   }
}

我想从这个 Json 数据中检索权限数组。
在终端上打印特权数组。
如何检索权限数组的 JSON 对象

这是我检索 JSON 数据的代码：

var data = json.decode(response.body);
    var resultCheck = data['result'];
    if (resultCheck == '0') {
      var rest = data["dashboard"];
      debugPrint(rest);
}

此代码的输出：

result check 0
I/flutter (18905): {"privilege":[
{"activity_id":165,"privilege_id":1568}

我想在打印权限时输出这种格式：

I/flutter (18905):[{"activity_id":165,"privilege_id":1568}]

如何在终端上仅获取特权数组以及如何打印特权对象？。

Answer 1

import 'dart:convert';

void main() {
  var jsonData='{"result":"0","school_code":"School Code","dashboard":{"resultPrivilege":"0", "privilege": [{"activity_id":"activity_id","privilege_id":"privilege_id"}]}}';
  var json=jsonDecode(jsonData);
  json['dashboard']['privilege'].forEach((obj){
    //
    print(obj.toString());
  });
}

Answer 2

Map previlege = {
    'result': '0',
    'school_code': 'School Code',
    'dashboard': {
      'resultPrivilege': '0',
      'privilege': [
        {
          'activity_id': 'activity_id',
          'privilege_id': 'privilege_id',
        }
      ],
    }
  };
  print('Reuslt:  ${previlege['result']}' +
      '\nSchool Code:  ${previlege['school_code']}' +
      '\nActivity ID:  ${previlege['dashboard']['privilege'][0]['activity_id']}');

Answer 3

尝试这个，

Map<String, dynamic> jsonBody = json.decode(response.body);

String result = jsonBody["result"];
if (result == '0') {
  Map<String, dynamic> dashboard = jsonBody["dashboard"];
  List privilege = dashboard["privilege"];
  debugPrint(privilege.toString());
}

或者您可以使用quicktype或JsonToDart在线工具轻松创建 PODO（Plain Old Dart Objects）类。 然后您可以将 JSON 转换为 dart 类对象。