This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
I would put it into a properties file. That way you can write code to reload the file contents at runtime when a particular URL is hit. That's not possible if you put it into web.xml (for which you'd need to reload the whole web application).