HTTP is not a file server protocol. So you can't access files through it.
What you can do is setup a webapp that returns the contents of a file in response to a URL request. That is default behavior for resources inside a WAR (except for WEB-INF and its children). For any other location, however, you have to provide your own file-transfer logic. This can be done with a fairly simple servlet that parses the URL to build a filename path, opens the file and copies its contents to the HttpServletResponse data stream.
Some people, when well-known sources tell them that fire will burn them, don't put their hands in the fire.
Some people, being skeptical, will put their hands in the fire, get burned, and learn not to put their hands in the fire.
And some people, believing that they know better than well-known sources, will claim it's a lie, put their hands in the fire, and continue to scream it's a lie even as their hands burn down to charred stumps.