从Android

Question

我已经在Node.js中编写了图片上传API，在Postman中可以正常工作，但是在Android中我没有任何办法做到这一点。我已经尝试过this library 但仍然无法解决。我的上传图片API如下

 var upload = multer({ dest: '/tmp/'});
 app.post('/file_upload', upload.single('file'), function(req, res) {
 var file = 'images' + '/' + req.file.filename+'.jpg';
  fs.rename(req.file.path, file, function(err) {
      if (err) {
             console.log(err);
             res.send(500);
    } else {
            res.json({
                  message: 'File uploaded successfully',
                  filename: req.file.filename
            });
    }
  });
});

离子库的实现如下

Ion.with(this)
   .load("http://104.131.162.126:3001/file_upload")
   .setMultipartParameter("name", "source")
   .setMultipartFile("image", "image/jpeg", f)
   .asJsonObject()
   .setCallback(new FutureCallback<JsonObject> () {
                        @Override
                        public void onCompleted(Exception e, JsonObject result) {
                             //do stuff with result
                            dialog.dismiss ();
                            Toast.makeText (NewActivity.this,"Image uploaded",Toast.LENGTH_LONG).show ();

                        }
                    });