Flutter：JSON循环

Question

我在Flutter中有一个Json解析项目，Json如下：

{
  "Dependents":[
      {
        "Name": "Kim",
        "Relationship": "Parent",
        "Entitlements": [
            {
              "GP": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "OPS": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "IP": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "Dental": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "Optical": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "Maternity": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            }
        ]
      },
      {
        "Name": "Tim",
        "Relationship": "Spouse",
        "Entitlements": [
            {
              "GP": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "OPS": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "IP": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "Maternity": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            }
        ]
      },
      {
        "Name": "Lim",
        "Relationship": "Child",
        "Entitlements": [
            {
              "GP": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "OPS": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "Dental": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "Optical": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "Maternity": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            }
        ]
      },
      {
        "Name": "Xim",
        "Relationship": "Child",
        "Entitlements": [
            {
              "GP": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "OPS": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            },
            {
              "IP": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            }
        ]
      }
    ]
}

如您所见，在受抚养人下有多个用户，在这些用户下有他们自己的权利。

我目前遇到的问题是：

由于每个用户都有与之关联的不同的权利，因此我如何循环浏览这些权利以打印出所有地图。

请协助。

Answer 1

您可以使用以下代码段：

  void iterateJson(String jsonStr) {
    Map<String, dynamic> myMap = json.decode(jsonStr);
    List<dynamic> entitlements = myMap["Dependents"][0]["Entitlements"];
    entitlements.forEach((entitlement) {
      (entitlement as Map<String, dynamic>).forEach((key, value) {
        print(key);
        (value as Map<String, dynamic>).forEach((key2, value2) {
          print(key2);
          print(value2);
        });
      });
    });
  }

尽管如果您不关心订单，可以通过删除列表并仅保留一张地图来简化“权利”字段：

"Entitlements": {
              "GP": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              },
              "OPS": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              },
              "IP": {
                "Entitlement": "10000",
                "Utilisation": "500",
                "Balance": "9500"
              }
            }

Answer 2

你有信息：http : //cogitas.net/parse-json-dart-flutter/

页面示例：

void _parseJsonForCrossword(String jsonString) {
Map decoded = JSON.decode(jsonString);

String name = decoded['name'];
 print(name);

 int id = decoded['id'];
 print(id.toString());

 for (var word in decoded['across']) {
   print(word['number'].toString());
   print(word['word']);
 }
}