Flutter 颤振Dio：无法将图像上载到服务器

首先，我先试试《邮递员》这本书

之后，我创建了我的dio函数，像这样上传到服务器

Future<AttendanceResponse> checkOut(
    String timeOfCheckout,
    File image,
    String notes,
  ) async {
    try {
      String fileName = image.path.split('/').last;
      print("Image name --> $fileName");
      print("Image path --> ${image.path}");
      final formData = FormData.fromMap({
        "out": timeOfCheckout,
        "out_picture": await MultipartFile.fromFile(
          image.path,
          filename: fileName,
        ),
        "out_note": notes,
        "late": 0,
      });
      final response = await dio.post("attendances/check-out", data: formData);
      return AttendanceResponse.fromJson(response.data);
    } on DioError catch (e) {
      return e.error;
    }
  }

这是摄像机的文件和路径

I/flutter ( 2163): Image name --> scaled_32592bd5-704d-4e0a-9976-9ea94c667f7d4583818212866102164.jpg
I/flutter ( 2163): Image path --> /storage/emulated/0/Android/data/id.cometdev.bozzetto.dev/files/Pictures/scaled_32592bd5-704d-4e0a-9976-9ea94c667f7d4583818212866102164.jpg

---

我已经在谷歌上搜索并读取了dio中的文档，并按照它进行操作，但仍然存在此错误。

您需要将

contentType

属性添加到表单数据中。看起来是这样的,

  final formData = FormData.fromMap({
    "out": timeOfCheckout,
    "out_picture": await MultipartFile.fromFile(
        image.path, 
        filename: fileName,
        contentType: new MediaType("image", "jpeg"), // Here we add the content type!
     ),
    "out_note": notes,
    "late": 0,
  });

---

这是我的错，我忘了在我的dio函数中添加

token

Future<AttendanceResponse> checkOut(
    String timeOfCheckout,
    File image,
    String notes,
  ) async {
    try {
      var fileName = image.path.split('/').last;
      var token = await prefHelper.getToken();
      print("Token --> $token");

      var headers = {
        'content-type': 'application/json',
        'accept': 'application/json',
        'authorization': 'Bearer $token',
      };

      final formData = FormData.fromMap({
        "out": timeOfCheckout,
        "out_picture": await MultipartFile.fromFile(
          image.path,
          filename: fileName,
        ),
        "out_note": notes,
        "late": 0,
      });
      final response = await dio.post("attendances/check-out",
          data: formData, options: Options(method: "POST", headers: headers));
      return AttendanceResponse.fromJson(response.data);
    } on DioError catch (e) {
      return e.error;
    }
  }

未来结账(
checkout的字符串时间，
文件图像，
弦乐，
)异步的{
试一试{
var fileName=image.path.split（“/”）.last；
var token=wait prefHelper.getToken（）；
打印（“令牌-->$Token”）；
变量头={
“内容类型”：“应用程序/json”，
“接受”：“应用程序/json”，
“授权”：“持票人$token”，
};
final formData=formData.fromMap({
“out”：checkout的时间，
“输出图片”：等待MultipartFile.fromFile(
image.path，
filename:filename，
),
“out_note”：注释，
“迟到”：0，
});
最终响应=等待dio.post（“出席/退房”，
数据：formData，选项：选项（方法：“POST”，标题：标题））；
返回AttendanceResponse.fromJson（response.data）；
}关于错误捕获（e）{
返回e.error；
}
}

我尝试添加，但仍然不起作用，仍然收到相同的错误

Future<AttendanceResponse> checkOut(
    String timeOfCheckout,
    File image,
    String notes,
  ) async {
    try {
      var fileName = image.path.split('/').last;
      var token = await prefHelper.getToken();
      print("Token --> $token");

      var headers = {
        'content-type': 'application/json',
        'accept': 'application/json',
        'authorization': 'Bearer $token',
      };

      final formData = FormData.fromMap({
        "out": timeOfCheckout,
        "out_picture": await MultipartFile.fromFile(
          image.path,
          filename: fileName,
        ),
        "out_note": notes,
        "late": 0,
      });
      final response = await dio.post("attendances/check-out",
          data: formData, options: Options(method: "POST", headers: headers));
      return AttendanceResponse.fromJson(response.data);
    } on DioError catch (e) {
      return e.error;
    }
  }