What is @ModelAttribute in Spring MVC?

java spring-mvc modelattribute
Mohammad Adnan picture Mohammad Adnan · Aug 6, 2010 · Viewed 384.8k times · Source

What is the purpose and usage of @ModelAttribute in Spring MVC?

Answer

fasseg picture fasseg · Aug 6, 2010

@ModelAttribute refers to a property of the Model object (the M in MVC ;) so let's say we have a form with a form backing object that is called "Person" Then you can have Spring MVC supply this object to a Controller method by using the @ModelAttribute annotation:

public String processForm(@ModelAttribute("person") Person person){
    person.getStuff();
}

On the other hand the annotation is used to define objects which should be part of a Model. So if you want to have a Person object referenced in the Model you can use the following method:

@ModelAttribute("person")
public Person getPerson(){
    return new Person();
}

This annotated method will allow access to the Person object in your View, since it gets automatically added to the Models by Spring.

See "Using @ModelAttribute".

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