颤振中的 FormatException

Question

我正在尝试使用 post http 方法将数据发送到我的服务器。后端工作完美（用 postman 进行测试）但是我在 flutter 中遇到了这个错误！

这是我的代码：

Future<MesureModel?> postMeasurement(String description) async {
    final response = await http.post(
        Uri.parse('${baseUrl}/api/v1/measurements/create'),
        body: {"description": description});
    var data = response.body;
    return MesureModel.fromJson(jsonDecode(response.body));
  }

这是我的模型：

List<MesureModel> mesureModelFromJson(String str) => List<MesureModel>.from(
    json.decode(str).map((x) => MesureModel.fromJson(x)));

String mesuretModelToJson(List<MesureModel> data) =>
    json.encode(List<dynamic>.from(data.map((x) => x.toJson())));

class MesureModel {
  MesureModel(
      {required this.measurement_id,
      required this.measured_value,
      required this.taken_by,
      required this.param_name,
      required this.description});

  int measurement_id;
  double measured_value;
  String taken_by;
  String param_name;
  String description;

  factory MesureModel.fromJson(Map<String, dynamic> json) => MesureModel(
      measurement_id: json["measurement_id"],
      measured_value: json["measured_value"],
      taken_by: json["taken_by"],
      param_name: json["param_name"],
      description: json["description"]);

  Map<String, dynamic> toJson() => {
        "measurement_id": measurement_id,
        "measured_value": measured_value,
        "taken_by": taken_by,
        "param_name": param_name,
        "description": description
      };
}

如果有人能帮助我，我将不胜感激！

Answer 1

Future<MesureModel?> postMeasurement(String description) async {
final response = await http.post(
    Uri.parse('${baseUrl}/api/v1/measurements/create'),
headers: {
  'Content-Type': 'application/json',
},
    body: json.encode({"input_description": description}));
var data = response.body;
return MesureModel.fromJson(jsonDecode(response.body));
}

Json 在发送前对正文进行编码

Answer 2

您应该指定 Content-Type 并对负载进行编码

  final response = await http.post(
    Uri.parse('${baseUrl}/api/v1/measurements/create'),
    headers: <String, String>{
      'Content-Type': 'application/json; charset=UTF-8',
    },
    body: jsonEncode(<String, String>{
      "description": description,
    }),
  );

  var data = response.body;
  return MesureModel.fromJson(jsonDecode(response.body));

颤振中的 FormatException

FormatException in flutter

api

dart

flutter