learning struts  is easy. u can refer to folowing books
1:) Mastering Jakarta Struts
2:) Professional Jakarta Struts

Actually srtuts set up is little complicated. There
are two major config files - struts-config.xml nad
tiles-definition.xml
but there are good sites and tutuorials on net.
If u know the MVC pattern then it would be more easy
for you to learn struts. if u have any further query
mail me. i have enough exp on struts