Multiple File upload through threads within JSP

Question

I am uploading multiple files within jsp through a thread.

But not getting confirmation message when data upload is completed. I have used join() for thread, & then displayed the dialog box after that & its work fine but only single file is uploaded at a time & others are waiting.

I have to show dialog box whenever the uploading gets completed.

So how to get acknowledge on jsp that the particular file has been uploaded successfully by the thread & then show dialog box.