flutter - 将图像数组上传到服务器

Question

当我上传一组图像时，我有一组图像要上传到服务器，它只上传最后一张图像我该如何解决这个问题，

  void uploads() async
{
var multipartFile;
var uri = Uri.parse( Config.URL + "Posts/Cube_Post_Submit");
var request = new http.MultipartRequest("POST", uri);
for(int i=0;i<image.length;i++)
{
  print(image[i]);
  var stream = new 
 http.ByteStream(DelegatingStream.typed(image[i].openRead()));
  var length = await image[i].length();
  multipartFile  = new http.MultipartFile('attachments', stream, length,
      filename: basename(image[i].path));
}   request.files.add(multipartFile);

request.fields['User_Id'] = Config.USER_ID;
request.fields['Cubes_Id'] = jsonstring;
request.fields['Post_Text'] =  "hello";
request.fields['Post_Category'] = "Story";
request.fields['Post_Link'] = "";
var response = await request.send();
print(response.statusCode);
response.stream.transform(utf8.decoder).listen((value)
{
  print(value);
});
}

Answer 1

您正在将 multipartFile 添加到 for 循环外的 request.files。把它移到里面...

void uploads() async {
  var uri = Uri.parse(Config.URL + 'Posts/Cube_Post_Submit');
  var request = http.MultipartRequest('POST', uri);
  for (int i = 0; i < image.length; i++) {
    request.files.add(
      http.MultipartFile(
        'attachments$i',
        http.ByteStream(DelegatingStream.typed(image[i].openRead())),
        await image[i].length(),
        filename: basename(image[i].path),
      ),
    );
  }

  request.fields['User_Id'] = Config.USER_ID;
  request.fields['Cubes_Id'] = jsonstring;
  request.fields['Post_Text'] = 'hello';
  request.fields['Post_Category'] = 'Story';
  request.fields['Post_Link'] = '';
  var response = await request.send();
  print(response.statusCode);
  response.stream.transform(utf8.decoder).listen((value) {
    print(value);
  });
}