How to set a root directory for file management in web application

Is it possible to set a default root directory for file management for a web application ?
We would upload some files and store them in the web server.
When we write the uploaded files without any path, the files are written in the config directory into the jdeveloper embedded oc4j directory.
When we write the uploaded with a relative path ("/somedir/filename"), the files are written in C:/somedir/filename.
We would like that all file management with relative path into the web application refer automatically to a given root directory (for example defined in web.xml).
Is it possible ?

I'm using the standard upload in adf faces.
The problem is not during upload. This is managed in a temporay directory defined in web.xml. The problem is for writing the file that was uploaded (upload give us an inputStream we have to write somewhere, eventually after unzipping).
Here is an example of our current code.
if (mimeType.equals("application/x-zip-compressed") |
mimeType.equals("application/zip")) {
File destZipFile =
new File(rootDirectory + "/" + parametersDirectory +
"/" + uploadedFile.getFilename());
BufferedInputStream isZipFile =
new BufferedInputStream(uploadedFile.getInputStream());
FileOutputStream fosZipFile =
new FileOutputStream(destZipFile);
BufferedOutputStream bosZipFile =
new BufferedOutputStream(fosZipFile, BUFFER);
// read and write until last byte is encountered
while ((currentByte = isZipFile.read(data, 0, BUFFER)) !=
-1) {
bosZipFile.write(data, 0, currentByte);
}

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