Flutter - 如何在表单数据中发送多个图像
Flutter - How to send multiple images in formdata
我想使用 dio 和 formData 在 flutter 中上传多张图片。我所做的是创建一个用于将 MultipartFile 存储在数组中的 for 循环,然后将数组传递给“img[]”的数据。但是,如果我传递了数组,我无法上传图片,但如果我上传单张图片,它就可以正常工作。
这是我的代码。
var arr = new List(3);
for (var i=0; i <_tryPath.length; i++) {
arr[i] = await MultipartFile.fromFile(imageFile[i].path, filename:
imageFile[i].path.split('/').last, contentType: new MediaType('image','jpg'));
};
print('this is arr = $arr');
FormData formData = new FormData.fromMap({
"name": "Max",
"location": "Paris",
"age": 21,
"img[]": arr,
});
// dio is in another class here in AuthService.
AuthService().donateRegister(formData).then((val) async {
print('successful');
print(val.data);
});
你能帮我在 formData 中上传很多图片吗?我也不想限制 MediaType。如果我还要上传 pdf/docu 或 jpg MediaType 怎么办?我会很感激你的时间和回答。谢谢!
您可以使用 for 循环来设置图像列表,如下所示
这里我用的是multi_image_picker
Future<int> addMultiImage({MyData myData, List<Asset> files}) async {
var formData = FormData.fromMap({
"name": "Max",
"location": "Paris",
"age": 21,
});
for (int i = 0; i < files.length; i++) {
var path = await FlutterAbsolutePath.getAbsolutePath(files[i].identifier);
formData.files.addAll([
MapEntry("img", await MultipartFile.fromFile(path, filename: path))
]);
}
Response response = await dioHelper.post(
"myPaths",
queryParameters: {
},
data: formData,
);
您可以使用 mime 包获取 mime 类型。
import 'package:path/path.dart' as path;
import 'package:mime/mime.dart';
String getFileName(String _path){
return path.basename(_path)
}
FilePickerResult? result = await FilePicker.platform.pickFiles(
allowMultiple: true,
type: FileType.custom,
allowedExtensions: ['jpg', 'pdf', 'doc'],
);
if(result != null) {
List<MultipartFile> files = result.paths.map((path) =>
MultipartFile.fromFileSync(
path,
filename: getFileName(path),
contentType: MediaType(
lookupMimeType(getFileName(path)).split('/')[0],
lookupMimeType(getFileName(path)).split('/')[1],
),
)
).toList();
var dio = Dio();
var formData = FormData.fromMap({
'name': 'wendux', // other parameter may you need to send
'age': 25, // other parameter may you need to send
'files': files,
});
var response = await dio.post('url', data: formData);
// check response status code
if(response.statusCode == 200){
// it's uploaded
}
} else {
// User canceled the picker
}
我想使用 dio 和 formData 在 flutter 中上传多张图片。我所做的是创建一个用于将 MultipartFile 存储在数组中的 for 循环,然后将数组传递给“img[]”的数据。但是,如果我传递了数组,我无法上传图片,但如果我上传单张图片,它就可以正常工作。
这是我的代码。
var arr = new List(3);
for (var i=0; i <_tryPath.length; i++) {
arr[i] = await MultipartFile.fromFile(imageFile[i].path, filename:
imageFile[i].path.split('/').last, contentType: new MediaType('image','jpg'));
};
print('this is arr = $arr');
FormData formData = new FormData.fromMap({
"name": "Max",
"location": "Paris",
"age": 21,
"img[]": arr,
});
// dio is in another class here in AuthService.
AuthService().donateRegister(formData).then((val) async {
print('successful');
print(val.data);
});
你能帮我在 formData 中上传很多图片吗?我也不想限制 MediaType。如果我还要上传 pdf/docu 或 jpg MediaType 怎么办?我会很感激你的时间和回答。谢谢!
您可以使用 for 循环来设置图像列表,如下所示
这里我用的是multi_image_picker
Future<int> addMultiImage({MyData myData, List<Asset> files}) async {
var formData = FormData.fromMap({
"name": "Max",
"location": "Paris",
"age": 21,
});
for (int i = 0; i < files.length; i++) {
var path = await FlutterAbsolutePath.getAbsolutePath(files[i].identifier);
formData.files.addAll([
MapEntry("img", await MultipartFile.fromFile(path, filename: path))
]);
}
Response response = await dioHelper.post(
"myPaths",
queryParameters: {
},
data: formData,
);
您可以使用 mime 包获取 mime 类型。
import 'package:path/path.dart' as path;
import 'package:mime/mime.dart';
String getFileName(String _path){
return path.basename(_path)
}
FilePickerResult? result = await FilePicker.platform.pickFiles(
allowMultiple: true,
type: FileType.custom,
allowedExtensions: ['jpg', 'pdf', 'doc'],
);
if(result != null) {
List<MultipartFile> files = result.paths.map((path) =>
MultipartFile.fromFileSync(
path,
filename: getFileName(path),
contentType: MediaType(
lookupMimeType(getFileName(path)).split('/')[0],
lookupMimeType(getFileName(path)).split('/')[1],
),
)
).toList();
var dio = Dio();
var formData = FormData.fromMap({
'name': 'wendux', // other parameter may you need to send
'age': 25, // other parameter may you need to send
'files': files,
});
var response = await dio.post('url', data: formData);
// check response status code
if(response.statusCode == 200){
// it's uploaded
}
} else {
// User canceled the picker
}