This week's book giveaway is in the Other Open Source APIs forum. We're giving away four copies of Storm Applied and have Sean Allen, Peter Pathirana & Matthew Jankowski on-line! See this thread for details.
The user uploaded files can be displayed in a web page using servlet/jsp by reading the physical file (FileReader etc). Then the bytes of the read stream can be written into the output stream of servlet to display the read files in web page.