You don't. FTP exists as a different protocol from HTTP.
What you might be able to do is make an HTTP based web service that interfaces with an app or servlet that does the FTP work. But really... not worth the hassle if you only want to spiffy up the login.
What you might be able to do is make an HTTP based web service that interfaces with an app or servlet that does the FTP work. But really... not worth the hassle if you only want to spiffy up the login.