w3schools.com -> Bootstrap 4 -> BootStap4 Forms

https://www.w3schools.com/bootstrap4/bootstrap_forms.asp

Bootstrap 4 Stacked Form 사용

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UserController

@Controller

public class UserController {

	@GetMapping("/user/joinForm")
	public String joinForm() {
		
		return "user/joinForm";
	}
    
	@GetMapping("/user/loginForm")
	public String loginForm() {
		
		return "user/loginForm";
	}