Ah kool, I personally have never used Struts i have more experience using JSF and shale for the front end. but here are a few things that mite be worth looking at the get up-to-speed before you starts. Shale Home Shale Wiki Shale Wikipedia
When I was learning i quite liked the "In Action" range of books, so Struts in Action would probably be quite a good place to start.
Its also worth noting that books and tutorials can only really take you so far but there is no substiture for actual hands on experience and your employer will know this, so dont panic. In my own experience, when i started my job, i had no prior knowledge of web based java development....I had never even looked into Struts or JSF so I was probably in what sounds like the same sort of situation your in now. Just read as much information as you can so you understand the concepts, this will give you the perfect place to start when you begin coding, and then with time you will be a pro lol!
Hope something i said helps
[ July 13, 2007: Message edited by: John Bartlett ]