Need help in using Java Threads

Hi All,
For my project i using Struts technology. In one occasion i am using thread to perform some task, say for example, File Uploading. My task is When the user clicks upload button my application have to upload the file to my local system and should show the result screen, for ex: File has been uploaded successfully!. But the problem here is my success page is getting first, even the thread is not complete.
So now i need a solution, that works like, till the file getting uploads my application have to show some progress message like file uploaded 50% so. after the thread completes i have to get the final message.
any reply is appreciatable.
Thanks in advance,
Regards,
Rk