You can have One Servlet acting as Controller.
All your requests can point to this one servlet.
Based on something in the request, like a param value, url etc, you can invoke your business logic in a
java class, and once done forward to a JSP page.
You can have a configuration file which stores information about what java class to invoke for a particular url/param-value, and which jsp to forward to. (which would be similar to struts-config file)