public class LoginForm implements Serializable {

	@NotEmpty(message = "Enter Id")
	private String id;

	@NotEmpty(message = "Enter Password")
	private String password;

	private String check;
	private String radio;
	private String select;
//getter,setter omitted

@Controller
@RequestMapping("/index")
//@Session Attributes is between multiple requests handled in one Controller
//Effective when sharing data.
//Specify the object class to be stored in the HTTP session in the types attribute.
@SessionAttributes(types=LoginForm.class)
public class IndexController {

	/*
	 *Add object to HTTP session
	 */
	@ModelAttribute("loginForm")
	public LoginForm setUpLoginForm(){
		return new LoginForm();
	}

	//The attribute name of the object obtained from Model is@Specify in the value attribute of ModelAttribute.
	//In this case, select of LoginForm class is specified.
	@PostMapping("check")
	public String loginCheck(@ModelAttribute("loginForm") @Validated LoginForm loginForm, BindingResult res,
			@ModelAttribute("select") String select, Model model) {
		//Check the input
		if (res.hasErrors()) {
			return "login";
		}
	}

	//In this case, the id of the LoginForm class is specified.
	@GetMapping("form")
	public String create(Model model, @ModelAttribute("id") String id) {
		return "create";
	}

}

<h3 th:text=${loginForm.id}></h3>
<h3 th:text=${loginForm.select}></h3>

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