WEB servers are not FILE servers. So you cannot simply browse them as though they were directories full of files. It would be a serious security issue, in fact, if you could. The "browse" functions that appservers such as Apache HTTPD offer are special features.
Likewise, webapps aren't allowed to browse files on the client's computer, either. The upload/download file dialog that pops up in a web browser is part of the web browser program itself, and can't be replaced with JSF.
If you wish to do something like Apache HTTP and present a subtree of the server's filesystem for browsing, you can use the RichFaces Tree control and map it against a directory listing.
However, under NO circumstances should you create anything that will upload files into the WAR itself. If you're planning to support file uploads, upload them to a location completely outside both the WAR and the app server directories. It's not only a violation of the J2EE spec to write to a WAR, it can get you into serious grief.
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