Response as an instance of ModelAndView

ModelAndView is a container object to hold both Model and View. With ModelAndView as a return object, the controller returns the both model and view as a single return value. The model is a map object which makes it possible to store key-value pairs. The following code sample represents the usage of ModelAndView in a Controller:

    @Controller
    @RequestMapping("/account/*")
    public class UserAccountController {
 
      @PostMapping("/signup/process")
      public ModelAndView processSignup(ModelMap model, @RequestParam("nickname")       String  nickname, @RequestParam("emailaddress") 
      String emailAddress, @RequestParam("password") String password) {
        model.addAttribute("login", true);
        model.addAttribute("nickname", nickname);
        model.addAttribute("message", "Have a great day ahead.");
        return new ModelAndView("index", model);
      }
    }

The following code samples represent the different ways in which an instance of ModelAndView is returned with different sets of information:

    // Will result in display of index.jsp page
    return new ModelAndView("index"); 

    // Will result in display of index.jsp page. 
    //The JSP page could consist of code such as "Hello ${name}" 
    //which will get displayed as "Hello Calvin Hobbes"  

    return new ModelAndView("index", "name", "Calvin Hobbes"); 

    // Will result in display of index.jsp page. 
    // The JSP page could consist of code such as 
    //"Hello ${model.firstName} ${model.lastName}" 
    //which will get displayed as "Hello Calvin Hobbes"

    UserInfo userInfo = new UserInfo();
    userInfo.setFirstName("Calvin");
    userInfo.setLastName("Hobbes");
    return new ModelAndView("index", "model", userInfo);

    // Will result in display of index.jsp page. 
    // The JSP page could consist of code such as "Hello ${name}" 
    // which will get displayed as "Hello Calvin Hobbes"

    Map<String, Object> map = new HashMap<String, Object>();
    map.put("name", "Calvin Hobbes");
    return new ModelAndView("index", map);