java - What is @ModelAttribute in Spring MVC? -

what purpose , usage of @modelattribute in spring mvc?

@modelattribute refers property of model object (the m in mvc ;) let's have form form backing object called "person" can have spring mvc supply object controller method using @modelattribute annotation:

public string processform(@modelattribute("person") person person){     person.getstuff(); } 

check here example (spring 2.5), see "using @modelattribute on method argument" (spring 3.1).

on other hand annotation used define objects should part of model. if want have person object referenced in model can use following method:

@modelattribute("person") public person getperson(){     return new person(); } 

this annotated method allow access person object in view, since gets automatically added models spring.

see "using @modelattribute on method" (spring 3.1).

hope helped.