Flutter Dio : How to Upload Image?

In Dio latest version, UploadFileInfo method has been replaced by MultipartFile class. And here the way how to use to post image, video or any file:

Future<String> uploadImage(File file) async {    String fileName = file.path.split('/').last;    FormData formData = FormData.fromMap({        "file":            await MultipartFile.fromFile(file.path, filename:fileName),    });    response = await dio.post("/info", data: formData);    return response.data['id'];}

Even this question is asked a while ago, I believe the main issue is the size of image especially with Laravel.Flutter Image Picker library offers some functionalities to reduce the size of Image, I solved it with bellow steps:

1. Create a method to get the Image, I am using Camera to Capture the photo

   Future getImage() async {     File _image;     final picker = ImagePicker();     var _pickedFile = await picker.getImage(    source: ImageSource.camera,    imageQuality: 50, // <- Reduce Image quality    maxHeight: 500,  // <- reduce the image size    maxWidth: 500);   _image = _pickedFile.path;  _upload(_image);}

2. Create _upload method to upload the photo, I am using Dio package Dio Package

   void _upload(File file) async {   String fileName = file.path.split('/').last;   FormData data = FormData.fromMap({      "file": await MultipartFile.fromFile(        file.path,        filename: fileName,      ),   });  Dio dio = new Dio();  dio.post("http://192.168.43.225/api/media", data: data)  .then((response) => print(response))  .catchError((error) => print(error));}

3. On the server side, I am using Laravel Laravel, I handle the request as follow

   public function store(Request $request){    $file = $request->file('file');    $extension = $file->getClientOriginalExtension();    $fullFileName = time(). '.'. $extension;    $file->storeAs('uploads', $fullFileName,  ['disk' => 'local']);    return 'uploaded Successfully';}

The following code uploads multiple image files from a dio client to a golang server.

1. dioclient.dart

 FormData formData = FormData.fromMap({   "name": "wendux",   "age": 25,   "other" : "params", }); for (File item in yourFileList)   formData.files.addAll([     MapEntry("image_files", await MultipartFile.fromFile(item.path)),   ]); Dio dio = new Dio()..options.baseUrl = "http://serverURL:port"; dio.post("/uploadFile", data: formData).then((response) {   print(response); }).catchError((error) => print(error));

2. golangServer.go

package mainimport (    "fmt"    "io"    "net/http"    "os")func uploadFile(w http.ResponseWriter, r *http.Request) {    err := r.ParseMultipartForm(200000)    if err != nil {        fmt.Fprintln(w, err)        return    }    formdata := r.MultipartForm    files := formdata.File["image_files"]    for i, _ := range files {        file, err := files[i].Open()        defer file.Close()        if err != nil {            fmt.Fprintln(w, err)            return        }        out, err := os.Create("/path/to/dir/" + files[i].Filename)        defer out.Close()        if err != nil {            fmt.Fprintf(w, "Unable to create the file for writing. Check your write access privilege")            return        }        _, err = io.Copy(out, file)        if err != nil {            fmt.Fprintln(w, err)            return        }        fmt.Fprintf(w, "Files uploaded successfully : ")        fmt.Fprintf(w, files[i].Filename+"\n")    }}func startServer() {    http.HandleFunc("/uploadFile", uploadFile)    http.ListenAndServe(":9983", nil)}func main() {    fmt.Println("Server starts!")    startServer()}