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.
Presizing the StringWriter is optional, but improves performance. Here I assumed that the file encoding was one byte per character. If that's not the case you may wish to presize differently - e.g. for UTF-16 use