Perhaps if you elaborate a little more on what you're trying to do, we might be able to offer some suggestions.
I'm not sure I understand your desire to use Struts without writing an action class. Action classes are an integral part of the structure of a Struts application, and you're extremely limited in what you can do without them.
It's a little like buying a new Ferrari and asking the dealer "can I install a speed governor that will keep it from going more than 30 Miles per hour?" The answer to this question is the same as the question "can I use Struts without action classes?". In both cases, the answer is "yes, but why would you want to?"