Types of MVC
MVC1 (Page-centric Architecture): There is no clear distinction between view and a controller. In Java terms, there is JSP page (view and partial controller) which itself controls Business logic (Model) that is why it is also called as page-centric architecture. Fig 2 below shows MVC1 implementation.
MVC2 (Servlet-centric architecture): MVC2 incorporates a clear separation of view and controller. A controller receives all the requests, retrieves data from a Model and forwards it to next view for presentation.
In Java terms, there is a central Servlet (Controller) which calls business logic (Model) and the forwards it particular JSP page (View) that is why it is also called servlet-centric architecture. Diagram below depicts MVC2 implementation.