What's the difference between ModelAndView and ModelMap?

Question

Is ModelMap just the new name in Spring 3 for a ModelAndView?

Does the functionality change in Spring 3?

Consider this code in a Spring 3 app using a ModelMap:

 @RequestMapping(value = "/order", method = RequestMethod.GET)
 public final String setup(final ModelMap model)
 {
  model.addAttribute(ORDER, new Order());
  return "setup";
 }

I would like to know what the equivalent use here of ModelAndView would be in an older Spring app? Would it just require a name change from ModelMap to ModelAndView to get this working in Spring 2.5?

score 24 · Accepted Answer · answered Jul 27 '10 at 14:33

24

ModelAndView, as its name suggests, contains the model, and the name of the view. ModelMap, in contract, only contains information about the model.

Your example would have been written (in "old" Spring) as

 public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response)
 {
  return new ModelAndView("setup", ORDER, new Order());
 }

answered Jul 27 '10 at 14:33

skaffman

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About the new spring 3: If I return only ModelMap, then how is the view returned? Newbie here... – Abhijeet Kashnia Jul 27 '10 at 14:48
1

@Abhijeet: Spring will infer the view name from the request URI. – skaffman Jul 27 '10 at 15:22
if i want to specify a view name explicitly ? So that I can use the same controller for different requests. – coder247 Mar 26 '12 at 10:31
what about a Model m ? – Junchen Liu May 18 '16 at 15:16

score 10 · Answer 2 · answered Feb 07 '13 at 14:13

10

@coder247 Someone correct me if I'm wrong, but you don't need to return a ModelMap. Add your attributes to your ModelMap and simply return a String which is the View name.

This is an excellent article that explains how to do this and more... http://www.mkyong.com/spring-mvc/spring-mvc-form-handling-annotation-example/

answered Feb 07 '13 at 14:13

Rob Breidecker

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+ 1 for pointing out **"you don't need to return a ModelMap"**. – May 18 '13 at 00:03

What's the difference between ModelAndView and ModelMap?

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