Assuming action1 has a forward something like this:
<forward name="success" path="/Action2.do"></forward>
Add redirect="true" to this tag.
This causes
Struts to send an instruction back to the browser to redirect to Action2, thereby having the URL line in the browser read "Action2.do".
However, this has a side-effect that may be unwanted: the request context is lost between Action1 and Action2. That means that any objects you attached to the request will be gone. If you need to pass information from Action1 to Action2, you will have to do it with parameters passed in the URI.