How to use the file uploaded using GWT?

Question

I'm preparing a project using Google Web Toolkit(GWT). I have to ask the user to upload a file(some text file) and have perform some operations on that file later. I have used FIleUpload to let the user upload a file, But what should I use to use that same file?

private FileUpload upload = new FileUpload();
private FormPanel fp = new FormPanel();

Following is the code in onModuleLoad()

String filename = upload.getFilename();
if (filename.length() == 0)
     Window.alert("No file selected");
else {
    fp.submit();
    Window.alert("Please wait!!");
}
fp.addSubmitCompleteHandler(new FormPanel.SubmitCompleteHandler() {
    @Override
    public void onSubmitComplete(SubmitCompleteEvent event) {
// TODO Auto-generated method stub
          Window.alert(event.getResults());
}
});

I have searched regarding this. Some say that downloading from client side isn't possible or I may have to use HTML5 for the same. So what is preferred to be done when I want that file, uploaded by the user, as a text/string or a file for further use?

score 0 · Answer 1 · edited May 23 '17 at 10:25

0

You can write a servlet and map to form panel action. You'l receive file in your servlet. There you can store in specified path.

A good example and other choices here.

Have a look at :Basic File upload in GWT

Later letting user to download it.

Implementing a simple file download servlet

edited May 23 '17 at 10:25

Community

1
1

answered Oct 22 '13 at 13:28

Suresh Atta

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I don't want the user to download any file as of now. The user will upload a file on the website which I have to use. So the user will upload and I have to download that file. – pnk6 Oct 22 '13 at 13:30
thank u for the link. But the first link doesn't have the complete code. – pnk6 Oct 22 '13 at 14:32
@user2327972 You mean the fileupload servlet ? – Suresh Atta Oct 22 '13 at 14:33

score 0 · Answer 2 · answered Oct 22 '13 at 14:28

Actually you can't just get your file cause of what FileUpload() widget is. It is just a HTML <input type='file'> and behave the same: post data to form action url. So you should recive it in destination point with servlet. Somthing like this. And then you can process your file.

How to use the file uploaded using GWT?

2 Answers2