Rénovation - Multipart demande: MultipartFile paramètre "file" (fichier n'est pas présent

Vous pouvez essayer l'exemple de code suivant. Dans cette démo application, nous allons télécharger une photo après la sélection de la Galerie. Espérons que cela aide!

construire.gradle fichier:

dependencies {
    ...
    compile 'com.squareup.retrofit2:retrofit:2.0.1'
    compile 'com.squareup.retrofit2:converter-gson:2.0.1'
    ...
}

WebAPIService.java fichier:

public interface WebAPIService {

    @Multipart
    @POST("/api/fileupload")
    Call<ResponseBody> postFile(@Part MultipartBody.Part file, @Part("description") RequestBody description);
}

FileActivity.java fichier:

...
import okhttp3.MediaType;
import okhttp3.MultipartBody;
import okhttp3.RequestBody;
import okhttp3.ResponseBody;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
public class FileActivity extends AppCompatActivity {
private final Context mContext = this;
private final String API_URL_BASE = "http://serverip:port";
private final String LOG_TAG = "BNK";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_file);
selectImage(); //selects a photo from Gallery
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == Activity.RESULT_OK && requestCode == 100) {
Uri fileUri = data.getData();
if (fileUri != null) {
uploadFile(fileUri); //uploads the file to the web service
}
}
}
private void uploadFile(Uri fileUri) {
String filePath = getRealPathFromUri(fileUri);
if (filePath != null && !filePath.isEmpty()) {
File file = new File(filePath);
if (file.exists()) {
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(API_URL_BASE)
.build();
WebAPIService service = retrofit.create(WebAPIService.class);
//creates RequestBody instance from file
RequestBody requestFile = RequestBody.create(MediaType.parse("multipart/form-data"), file);
//MultipartBody.Part is used to send also the actual filename
MultipartBody.Part body = MultipartBody.Part.createFormData("file", file.getName(), requestFile);
//adds another part within the multipart request
String descriptionString = "Sample description";
RequestBody description = RequestBody.create(MediaType.parse("multipart/form-data"), descriptionString);
//executes the request
Call<ResponseBody> call = service.postFile(body, description);                
call.enqueue(new Callback<ResponseBody>() {
@Override
public void onResponse(Call<ResponseBody> call,
Response<ResponseBody> response) {
Log.i(LOG_TAG, "success");
}
@Override
public void onFailure(Call<ResponseBody> call, Throwable t) {
Log.e(LOG_TAG, t.getMessage());
}
});
}
}
}
private void selectImage() {
Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
intent.setType("image/*");
startActivityForResult(intent, 100);
}
public String getRealPathFromUri(final Uri uri) {
//DocumentProvider
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT && DocumentsContract.isDocumentUri(mContext, uri)) {
//ExternalStorageProvider
if (isExternalStorageDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
if ("primary".equalsIgnoreCase(type)) {
return Environment.getExternalStorageDirectory() + "/" + split[1];
}
}
//DownloadsProvider
else if (isDownloadsDocument(uri)) {
final String id = DocumentsContract.getDocumentId(uri);
final Uri contentUri = ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
return getDataColumn(mContext, contentUri, null, null);
}
//MediaProvider
else if (isMediaDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
Uri contentUri = null;
if ("image".equals(type)) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
} else if ("video".equals(type)) {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
} else if ("audio".equals(type)) {
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
}
final String selection = "_id=?";
final String[] selectionArgs = new String[]{
split[1]
};
return getDataColumn(mContext, contentUri, selection, selectionArgs);
}
}
//MediaStore (and general)
else if ("content".equalsIgnoreCase(uri.getScheme())) {
//Return the remote address
if (isGooglePhotosUri(uri))
return uri.getLastPathSegment();
return getDataColumn(mContext, uri, null, null);
}
//File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}
private String getDataColumn(Context context, Uri uri, String selection,
String[] selectionArgs) {
Cursor cursor = null;
final String column = "_data";
final String[] projection = {
column
};
try {
cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,
null);
if (cursor != null && cursor.moveToFirst()) {
final int index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}
private boolean isExternalStorageDocument(Uri uri) {
return "com.android.externalstorage.documents".equals(uri.getAuthority());
}
private boolean isDownloadsDocument(Uri uri) {
return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}
private boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
private boolean isGooglePhotosUri(Uri uri) {
return "com.google.android.apps.photos.content".equals(uri.getAuthority());
}
}

OriginalL'auteur BNK