how to update the file using java

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Java

Hi..,

My project is related to conferences. user can register into my website upload abstract about their conferences. Before freeze this abstract. user can modify this document and then save. So now my requirement is i have maintain all these uploaded files in my project folder and maintaining path in database. So when user wants to modify the document(odcx.pdf,excel) open the document and then save. i want to maintain all these updated files in another folder. i used the following script for opening the document


javascipt:window.open('<%=path of the file%>');


so how can i modify the content & then save modified copy of that file into another folder, without re-uploading the file????


Any help??