My web hosting service provider allows me to uplaod my ROOT.war file only. and there is no directory structure. So is there any way by which I can upload pics and add new pages or make changes in existing pages without re-uploading the entire ROOT.war file.

P.S. I also want to learn how can I rename a file?. For example I want a user to upload his profile picture, now that picture should be saved in the images/user/profile_pic/user_no folder with the name user_no.gif. How can I achieve this?