Spring/Struts usage

Hi ,
                I have a newbie question. When using a web framework like Spring you write controllers that are mapped to requests, add data to the response (Model Map) and return a uri to correct view. With velocity you could also write classes that would return the correct entities and add them to the velocity context. Then merge. How is this accomplished with Spring MVC? A small snippet would help. Do you call merge in the method w/o returning values through the map.


Thanks in advance,

Mike