What is the simplest/easiest way of replacing a struts 2 file/submit tag combo with code to make it take a file from a directory on a remote server?

What is the simplest/easiest way of replacing a struts 2 file/submit tag combo with code to make it take a file from a directory on a remote server? There is only one .jsp for this whole page also, which is the way I wish to keep it.