This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Java provides the java.io.File class for getting at details of the filing system such as directory names. Creating the dropdown is a matter of getting the HTML correct - I suggest you make a mock-up in pure HTML and then figure out how to populate it with real data in a JSP. Bill