나는 이런 식으로 있습니다
Widget.presenter.java :
uploadButton.addClickHandler(new ClickHandler() {
@Override
public void onClick(ClickEvent event) {
//init action
imageService.getBlobStoreUploadUrl(new AsyncCallback<String>() {
@Override
public void onFailure(Throwable caught) {
Window.alert("Oups Error at ImageUploaderPresenter");
}
@Override
public void onSuccess(String result) {
uploadForm.setActionUpload(result);
uploadForm.submit();
}
}
});
}
ImageServiceImpl.java :
@Override
public String getBlobStoreUploadUrl() {
//Map the UploadURL to the uploadservice which will be called by
//submitting the FormPanel
return blobstoreService.createUploadUrl("/imageUpload");
}