JavaServer Faces™ (JSF)  is the well-established standard for UI development in Java. The standard is component-based and event-oriented, and is based on the MVC pattern. JSF allows to define prebuilt parts-widgets (UI elements) tightening also the link between client-side events and server application logic.

In Java you can get a list of files using listFiles method of java.io.File class. It is very simple to filter the files by types, names or other attributes, but it is not very intuitive. This article gives you some examples of how to implement the file filtering for listFiles.