Hello.
I wanted to tell you that probably you will find Struts 2 far better than Struts. If I were you I'd rather learn Struts 2 and in that case it would be better to study Struts only for a while and early begin studying Struts 2.
Once you know Struts and you want to begin working in a real project, you may find very usefull to integrate Struts 2 with other frameworks that cover other concerns. Just as an example I think that Spring2+Struts2+Sitemesh or Spring2+Struts2+Tiles are very good teams. They work very well together.
I hope it was of your interest