Using the getResource method

http://livedocs.adobe.com/jrun/4/Programmers_Guide/techniques_servlet19.htm
You can use the ServletContext object's getResource method to include content in your servlet. The getResource method returns a URL object. Then you can use the URL object to access the content. One advantage of using the URL object is that you can parse the content before returning it to the browser. You can also use this technique to include content that is otherwise not accessible to the users directly, such as files in the /WEB-INF directory.