How Spring MVC returns models and views

This article will explain in detail how Spring MVC returns the model and view. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

Return to models and views

After processing the business logic, the processor method returns a view, which is then parsed by Springdispatcher servlet. Spring supports the handler method to return a String object or a ModelAndView object. As shown below, the handler method returns a String object and represents the view name LoginForm:

@ RequestMapping (value = "/ login", method = RequestMethod.GET) public String viewLogin () {return "LoginForm";}

This is the easiest way to return the view name. But if you want to send additional data to the view, you must return the ModelAndView object. Such as:

@ RequestMapping ("/ listUsers") public ModelAndView listUsers () {List listUser = new ArrayList (); / / get user list from DAO... ModelAndView modelView = new ModelAndView ("UserList"); modelView.addObject ("listUser", listUser); return modelView;}

As shown above, the handler method returns a ModelAndView object whose view name is UserList and has a set of User objects available in the view.

Spring is a very flexible framework that allows ModelAndView objects to be declared as parameters of handler methods without having to recreate one. Therefore, the above example can be rewritten as follows:

@ RequestMapping ("/ listUsers") public ModelAndView listUsers (ModelAndView modelView) {List listUser = new ArrayList (); / / get user list from DAO... ModelView.setViewName ("UserList"); modelView.addObject ("listUser", listUser); return modelView;} this article on "how Spring MVC returns models and views" ends here. I hope the above content can be of some help to you, so that you can learn more knowledge. If you think the article is good, please share it for more people to see.