小编Far*_*ida的帖子

我是 flutter 新手，正在使用 json。当我使用以下命令解码从服务器获得的响应时，json.decode()有时会出现以下错误

flutter: FormatException: Unexpected character (at character 21)

有时它工作得很好。

这是我的代码

try {
    Map<String, dynamic> map = new Map<String, dynamic>.from(
        json.decode(contents));
    if (map["CompletedJobPackages"] != null) {
      DataStream.compleatedJobspackage =
          DataStream.parseCompletedJobs(map["CompletedJobPackages"]);
      print(map["CompletedJobPackages"]);
      compleatedJobs = DataStream.compleatedJobspackage;
    }
    CompletedJobloaded = true;
  }
  catch(e){
    print(e);
    ToastUtils.showCustomToast(context, "An Error Occured. Try Again !", false);

  }

这是我要解码的对象

{
            "CompletedJob": {
                "CompletedJobID": 7,
                "DriverID": 34,
                "JobNumber": "80252C20",
                "TraderID": 7,
                "TripType": "Two Way",
                "CargoType": "wd",
                "CargoWeight": 230,
                "LoadingPlace": "dc",
                "UnloadingPlace": "sd",
                "LoadingDate": "2020-05-25",
                "LoadingTime": "12:59:00", …

当我尝试发布请求时，我得到

[VERBOSE-2:ui_dart_state.cc(177)] Unhandled Exception: HandshakeException: Handshake error in client (OS Error: 
CERTIFICATE_VERIFY_FAILED: ok(handshake.cc:354))

我的代码（示例中提供）

 Future login() async {
final request = {
  "j_username": "user1",
  "j_password": "pass1",
};

 final response = await _dio.post('/itim/restlogin/login.jsp', data: request);
//get cooking from response
final cookies = response.headers.map['set-cookie'];
if (cookies.isNotEmpty && cookies.length == 2) {
  final authToken = cookies[1].split(';')[0]; //it depends on how your server sending cookie
  //save this authToken in local storage, and pass in further api calls.

  aToken = authToken;
  print("authToken");
//saving this to …