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#Complete Reference : http://docs.spring.io/spring/docs/current/spring-framework-reference/html/mvc.html

Architecture Diagram

http://docs.spring.io/spring/docs/current/spring-framework-reference/html/images/mvc.png

Dispatcher Servlet

  • Dispatches requests to handlers, with configurable handler mappings
  • View Resolution
  • Locale, time zone and theme resolution
  • Support for uploading files.

Flexible Data Binding

  • Any POJO can be used as a command or form backing object
  • Highly Flexible Data Binding. Databinding Errors do not throw exceptions. They only cause validation errors.

Flexible View Resolution

Controller can either

  • Return a View
  • Return a View or Model
  • Write to response stream directly

Flexible Controller Methods

Accepting Variety of Parameters

Support Multiple Return Types

  • A ModelAndView object
  • A Model object

##@ModelAttribute

Methods

  • Indicates the purpose of that method is to add one or more model attributes.
  • Invoked before @RequestMapping methods.
  • Used to fill the model with commonly needed attributes
    • Drop down values for form
    • Command or Form Backing Objects

Method Argument

  • To automatically add/retrieve value from Model
  • It can be stored in session as well using @SessionAttributes.

Validation

Automatic

@Valid annotation

Customized

You can also invoke validation using your own custom validator

@RequestMapping(path = "/something", method = RequestMethod.POST)
public String processSubmit(@ModelAttribute("todo") Pet Todo, BindingResult result) {
    new TodoValidator().validate(todo, result);
    if (result.hasErrors()) {
        return "todo";
    }
    // ...
}

##@ControllerAdvice

  • Can contain @ExceptionHandler, @InitBinder, and @ModelAttribute annotated methods
  • These methods will apply to @RequestMapping methods across all controller hierarchies

Hibernate Validator : JSR 349 Reference Implementation

For more information refer http://docs.jboss.org/hibernate/validator/5.0/reference/en-US/html_single/#validator-defineconstraints-spec