Flutter Dio 文件上传并实现进度监听

 ///手机中的图片
  String localImagePath ="/storage/emulated/0/Download/17306285.jpg";
  ///上传的服务器地址
  String netUploadUrl = "http://192.168.0.102:8080/fileupload";

  ///dio 实现文件上传
  void fileUplod() async{
    ///创建Dio
    Dio dio = new Dio();

    Map<String ,dynamic> map = Map();
    map["auth"]="12345";
    map["file"] = await MultipartFile.fromFile(localImagePath,filename: "xxx23.png");
    ///通过FormData
    FormData formData = FormData.fromMap(map);
    ///发送post
    Response response = await dio.post(netUploadUrl, data: formData,
      ///这里是发送请求回调函数
      ///[progress] 当前的进度
      ///[total] 总进度
      onSendProgress: (int progress, int total) {
        print("当前进度是 $progress 总进度是 $total");
      },);
    ///服务器响应结果
    var data = response.data;

  }