This week's giveaway is in the EJB and other Java EE Technologies forum. We're giving away four copies of EJB 3 in Action and have Debu Panda, Reza Rahman, Ryan Cuprak, and Michael Remijan on-line! See this thread for details.
The port to which the container is bound is not controlled by the servlets. This is a configuration issue. It's also one that is greatly affected by the operating system. (i.e. On Unix systems, you would need to be root uer to bind to ports lower than 1025. You also can't have two applications bound to the same port/protocol combination).