How to obtain a URL from a path in a class' method?

Hey everyone!
Newbie here needing to convert the following method from a jsp page into a class for one of our applications.
I have a method in a class which takes a path (as a string). However, I can't seem to figure out how to have java output the corresponding URL in a jsp page.
For example, in the jsp file, I would provide something like:
"./../../../../../../temp/gfx/" as the path.
The "getRealPath()" method converts it nicely to a URL. However, I can't seem to figure out how to use this method within a class file. Is there a way to obtain the URL from a class' method? If so, how?
--- old code below ---
ServletContext application = getServletConfig().getServletContext();
String msg = "";//#Either the IMG tag or message to be returned.
File dir = new File(application.getRealPath(IMAGE_DIRECTORY));

Thanks for that hint!
Also, we're using Websphere... is there an easy way to take a partial url passed as a string and find the full path for it?
Example:
/images/today/
and have it automatically converted to:
F:/Inetpub/wwwroot/images/today/
automatically in java?
Or is this something where both a full system path and URL need to be passed?
Thanks!

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