This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
If you are already quite proficient with Servlets and JSP then Struts: the Complete Reference by James Holmes or Pro Jakarta Struts, Second Edition by John Carnell and Rob Harrop. I don't think there's a single perfect Struts book, but either one of those should be helpful.