[Spring] @ManyToOne 어노테이션 3 로그인, 로그아웃

류재성

Mar 18, 2024

Contents

1. View 확인 2. 레파지토리 3. 컨트롤러 4. View 확인

1. View 확인

클라이언트로부터 username 과 password 를 받기 위해 DTO를 만든다.


    @Data
    public static class LoginDTO{
        private String username;
        private String password;

    }

2. 레파지토리


@RequiredArgsConstructor
@Repository
public class UserRepository {

    private final EntityManager em;

    public User findByUsernameAndPassword(UserRequest.LoginDTO requestDTO) {
        String q = """
                select u from User u where u.username = :username and u.password =:password
                """;
        Query query = em.createQuery(q, User.class);
        query.setParameter("username",requestDTO.getUsername());
        query.setParameter("password",requestDTO.getPassword());

        return (User) query.getSingleResult();

    }
  }

3. 컨트롤러


   //로그인
    @PostMapping("/login")
    public String login(UserRequest.LoginDTO requestDTO){

       User sessionUser = userRepository.findByUsernameAndPassword(requestDTO);
       session.setAttribute("sessionUser",sessionUser);
       return "redirect:/";
    }
    
    //로그아웃
    @GetMapping("/logout")
    public String logout() {
        session.invalidate();
        return "redirect:/";
    }

4. View 확인


            <ul class="navbar-nav">
                {{#sessionUser}}
                    <li class="nav-item">
                        <a class="nav-link" href="/board/save-form">글쓰기</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="/user/update-form">회원정보보기</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="/logout">로그아웃</a>
                    </li>
                {{/sessionUser}}
                {{^sessionUser}}
                    <li class="nav-item">
                        <a class="nav-link" href="/join-form">회원가입</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="/login-form">로그인</a>
                    </li>
                {{/sessionUser}}

💡

sessionUser 값이 있다면 로그인 상태로, 로그인 상태와 비로그인 상태일 때 네비게이션 바에 표시될 버튼을 구분한다.

@RequiredArgsConstructor @Repository public class UserRepository { private final EntityManager em; public User findByUsernameAndPassword(UserRequest.LoginDTO requestDTO) { String q = """ select u from User u where u.username = :username and u.password =:password """; Query query = em.createQuery(q, User.class); query.setParameter("username",requestDTO.getUsername()); query.setParameter("password",requestDTO.getPassword()); return (User) query.getSingleResult(); } }

//로그인 @PostMapping("/login") public String login(UserRequest.LoginDTO requestDTO){ User sessionUser = userRepository.findByUsernameAndPassword(requestDTO); session.setAttribute("sessionUser",sessionUser); return "redirect:/"; } //로그아웃 @GetMapping("/logout") public String logout() { session.invalidate(); return "redirect:/"; }

<ul class="navbar-nav"> {{#sessionUser}} <li class="nav-item"> <a class="nav-link" href="/board/save-form">글쓰기</a> </li> <li class="nav-item"> <a class="nav-link" href="/user/update-form">회원정보보기</a> </li> <li class="nav-item"> <a class="nav-link" href="/logout">로그아웃</a> </li> {{/sessionUser}} {{^sessionUser}} <li class="nav-item"> <a class="nav-link" href="/join-form">회원가입</a> </li> <li class="nav-item"> <a class="nav-link" href="/login-form">로그인</a> </li> {{/sessionUser}}