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[Spring] REST API 컨트롤러 요청과 응답

류재성's avatar
류재성
Apr 01, 2024
[Spring] REST API 컨트롤러 요청과 응답
Contents
1. 요청 BODY 수정2. 응답 BODY 수정
💡
1.요청은 JSON 으로 통일, 응답도 JSON 으로 통일 2.POST, PUT 요청은 추가된 ROW 혹은 수정된 ROW 를 응답해줘야 한다. 그래야 PK 를 알 수 있다. 인서트 업데이트된 데이터가 있어야 프론트가 알 수 있다. 3. 화면에 필요한 데이터만 전달해야 한다. 그래서 DTO 가 필요하다. → DTO 를 만드는 책임은 서비스가 갖는다. 서비스에서 DTO 를 만들면 커넥션 시간이 줄어든다.
 

전체 코드

board

Board
package shop.mtcoding.blog.board;


import jakarta.persistence.*;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.hibernate.annotations.CreationTimestamp;
import shop.mtcoding.blog.reply.Reply;
import shop.mtcoding.blog.user.User;

import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.List;

@NoArgsConstructor  // 빈생성자가 필요
@Entity
@Data
@Table(name = "board_tb")
public class Board {
    @Id
    @GeneratedValue (strategy = GenerationType.IDENTITY)
    private Integer id;
    private  String title;
    private  String content;

    //@JoinColumn(name="user_id") 변수명을 직접 지정 가능


    @ManyToOne(fetch = FetchType.LAZY)
    private User user ;  // 변수명이 user. user_id 를 만들어줌


    @CreationTimestamp // persistance centext 에 전달될 때 자동으로 주입됨.
    private Timestamp createdAt;

    //테이블은 생성되면 안됨. 조회된 것을 담는 용도로만 사용.
    //@ManyToOne 은 eager 가 기본, @OneToMany 는 lazy 가 기본
    @OrderBy("id desc") // 댓글 정렬
    @OneToMany(mappedBy = "board",fetch = FetchType.LAZY, cascade = CascadeType.REMOVE) // Board 는 엔티티 객체의 필드명, reply 엔티티에 Board 객체를 넣는거임
    private List<Reply> replies = new ArrayList<>(); // 댓글이 없으면 null 일 때 오류남. 그래서 new 를 해서 크기를 0 으로 만들어놓는다.


    @Transient // 테이블 생성이 안됨. 임시로 사용함
    private boolean isBoardOwner ;

    @Builder  //엔티티에는 다 걸기
    public Board(Integer id, String title, String content, User user, Timestamp createdAt) {
        this.id = id;
        this.title = title;
        this.content = content;
        this.user = user;
        this.createdAt = createdAt;
    }

    

    public void update(BoardRequest.UpdateDTO requestDTO){
        this.title =requestDTO.getTitle();
        this.content = requestDTO.getContent() ;
    }

}
BoardController
package shop.mtcoding.blog.board;

import jakarta.servlet.http.HttpSession;
import lombok.RequiredArgsConstructor;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
import shop.mtcoding.blog._core.util.ApiUtil;
import shop.mtcoding.blog.user.User;

import java.util.List;


@RequiredArgsConstructor
@RestController
public class BoardController {
    private final BoardService boardService ;
    private final HttpSession session;

    // todo : 글목록조회 api 필요
    @GetMapping("/")
    public ResponseEntity<?> main(){
        List<Board> boardList = boardService.글목록조회();
        return  ResponseEntity.ok(new ApiUtil(boardList));
        //디스패쳐 서블릿은 오브젝트가 리턴되면, 메세지컨버터가 보드에 있는 애들을 게터로 제이슨으로 변환
        // GETuser를 하는 순간 없기 때문에 select 로 통신. 근데 화면에 그림을 그릴 때는 null 이기 때문에 터짐.
        // 메세지 컨버터가 기다린다면 괜찮음.
        // 그래서 메세지 컨버터가 레이지 로딩을 하면 안되고 서비스에서 레이지 로딩해서 dto 로 받아와야 됨
    }

    @GetMapping("/api/boards/{id}/detail")
    public ResponseEntity<?> detail(@PathVariable int id){
        User sessionUser = (User) session.getAttribute("sessionUser");
        Board board = boardService.글상세보기(id,sessionUser);
        return  ResponseEntity.ok(new ApiUtil(board));
    }

    @GetMapping("/api/boards/{id}")
    public ResponseEntity<?> findOne(@PathVariable int id){
        User sessionUser = (User) session.getAttribute("sessionUser");
        Board board = boardService.글조회(id,sessionUser.getId());
        return  ResponseEntity.ok(new ApiUtil(board));
    }




        @PostMapping("/api/boards")
    public ResponseEntity<?> save(@RequestBody BoardRequest.SaveDTO requestDTO){
        User sessionUser = (User) session.getAttribute("sessionUser");
        Board board = boardService.글쓰기(requestDTO,sessionUser);
        return ResponseEntity.ok(new ApiUtil(board)) ;
    }


    @DeleteMapping("/api/boards/{id}")
    public ResponseEntity<?>  delete(@RequestBody @PathVariable Integer id){
        User sessionUser = (User) session.getAttribute("sessionUser");
        boardService.글삭제(id,sessionUser.getId());

        return ResponseEntity.ok(new ApiUtil(null));
    }

//    @PutMapping("/api/boards/{id}")
//    public ResponseEntity<?> update(@RequestBody @PathVariable Integer id){
//        User sessionUser = (User) session.getAttribute("sessionUser");
//       Board board = boardService.글조회(id,sessionUser.getId());
//        return ResponseEntity.ok(new ApiUtil(board)) ;
//    }

}
BoardJPARepository
package shop.mtcoding.blog.board;


import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;

import java.util.Optional;

public interface BoardJPARepository extends JpaRepository<Board,Integer> {

    @Query("select b from Board b join fetch b.user where b.id = :id")
    Optional<Board> findByIdJoinUser(@Param("id") int id);

    @Query("select b from Board b join fetch b.user u left join fetch b.replies r where b.id = :id")
    Optional<Board> findByIdJoinUserAndReplies(@Param("id") int id);
}
BoardRequest
package shop.mtcoding.blog.board;


import lombok.Data;
import shop.mtcoding.blog.user.User;

public class BoardRequest {

    @Data
    public static class SaveDTO {
        private String title;
        private String content;

        public Board toEntity(User user) {
            return Board.builder()
                    .title(title)
                    .content(content)
                    .user(user)
                    .build();

        }

    }
    @Data
    public static class UpdateDTO{
        private String title;
        private String content;

    }

}
BoardService
package shop.mtcoding.blog.board;

import lombok.RequiredArgsConstructor;
import org.springframework.data.domain.Sort;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import shop.mtcoding.blog._core.err.exception.Exception403;
import shop.mtcoding.blog._core.err.exception.Exception404;

import shop.mtcoding.blog.user.User;

import java.util.List;

@RequiredArgsConstructor
@Service
public class BoardService {
    private final BoardJPARepository boardJPARepository;

    @Transactional
    public Board 글쓰기(BoardRequest.SaveDTO requestDTO, User sessionUser) {
      return  boardJPARepository.save(requestDTO.toEntity(sessionUser));
    }

    @Transactional
    public Board 글조회(int boardId, int sessionUserId) {
        //조회 및 예외처리
        Board board = boardJPARepository.findById(boardId)
                .orElseThrow(() -> new Exception404("게시글을 찾을 수 없습니다."));
        //권한 처리,
        if (sessionUserId != board.getUser().getId()) {
            throw new Exception403("게시글을 수정할 권한이 없습니다");
        }


        return board;
    }


    @Transactional
    public void 글삭제(int boardId, int sessionUserId) {
        Board board = boardJPARepository.findById(boardId).orElseThrow(() -> new Exception404("게시글을 찾을 수 없습니다."));
        if (sessionUserId != board.getUser().getId()) {
            throw new Exception403("게시글을 삭제할 권한이 없습니다");
        }// 트랜잭션은 런타임익셉션이 발동하면 롤백된다.
        boardJPARepository.deleteById(boardId);

    }

    public List<Board> 글목록조회() {
        Sort sort = Sort.by(Sort.Direction.DESC, "id");
        List<Board> boardList = boardJPARepository.findAll(sort);
        return boardList;
    }

    public Board 글상세보기(int boardId, User sessionUser) {
        Board board = boardJPARepository.findByIdJoinUser(boardId)
                .orElseThrow(() -> new Exception404("게시글을 찾을 수 없습니다"));

        boolean isBoardOwner = false;
        if (sessionUser != null) {
            if (sessionUser.getId() == board.getUser().getId()) {
                isBoardOwner = true;
            }
        }

        board.setBoardOwner(isBoardOwner);

        board.getReplies().forEach(reply ->{
            boolean isReplyOwner = false ;
            if(sessionUser!=null) {
                if (reply.getUser().getId() == sessionUser.getId()) {
                    isReplyOwner =true;
                }
            }
            reply.setReplyOwner(isReplyOwner);
        });

        return board;
    }

}
 
 

user

User
package shop.mtcoding.blog.user;

import jakarta.persistence.*;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.hibernate.annotations.CreationTimestamp;

import java.sql.Timestamp;


@NoArgsConstructor  //  빈생성자가 필요
@Entity
@Data
@Table(name = "user_tb")
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id ;
    @Column(unique = true)
    private String username ;
    private String password;
    private String email;
    @CreationTimestamp // persistance centext 에 전달될 때 자동으로 주입됨.
    private Timestamp createdAt;

    @Builder //빌더 패턴
    public User(int id, String username, String password, String email, Timestamp createdAt) {
        this.id = id;
        this.username = username;
        this.password = password;
        this.email = email;
        this.createdAt = createdAt;
    }
}
UserController
package shop.mtcoding.blog.user;

import jakarta.persistence.NoResultException;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpSession;
import lombok.RequiredArgsConstructor;
import org.springframework.dao.DataIntegrityViolationException;
import org.springframework.dao.EmptyResultDataAccessException;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.stereotype.Repository;
import org.springframework.web.bind.annotation.*;
import shop.mtcoding.blog._core.err.exception.Exception400;
import shop.mtcoding.blog._core.err.exception.Exception401;
import shop.mtcoding.blog._core.util.ApiUtil;

import java.net.http.HttpRequest;

@RequiredArgsConstructor
@RestController
public class UserController {

    private final UserService userService;
    private final HttpSession session;

    @GetMapping("/api/users/{id}")
    public ResponseEntity<?> userinfo(@PathVariable Integer id){
        User user = userService.회원조회(id);
        return ResponseEntity.ok(new ApiUtil(user));
    }

    @PostMapping("/join")
    public ResponseEntity<?> join(@RequestBody UserRequest.JoinDTO requestDTO){

       User user = userService.회원가입(requestDTO);
        return ResponseEntity.ok(new ApiUtil(user));  // 프론트에서 자동으로 세션을 가짐
    }

    @PostMapping("/login")
    public ResponseEntity<?> login(@RequestBody UserRequest.LoginDTO requestDTO){

        User sessionUser =userService.로그인(requestDTO);
        session.setAttribute("sessionUser",sessionUser);

        return ResponseEntity.ok(new ApiUtil(null));
    }


    @PutMapping("/api/users/{id}") //회원 수정은 세션 id 를 받기 때문에 주소에 id가 필요없다. 하지만 프론트 입장에선 필요하다. 또 관리자가 수정을 해야한다면 구분이 필요하다.
    public ResponseEntity<?> update(@RequestBody @PathVariable Integer id, UserRequest.UpdateDTO requestDTO){
        User sessionUser = (User) session.getAttribute("sessionUser");
        User newSessionUser = userService.회원수정(sessionUser.getId(),requestDTO);
        session.setAttribute("sessionUser",newSessionUser);

        return ResponseEntity.ok(new ApiUtil(newSessionUser));
    }

    @GetMapping("/logout")
    public ResponseEntity<?> logout() {
        session.invalidate();
        return ResponseEntity.ok(new ApiUtil(null)) ;
    }
}
UserJPARepository
package shop.mtcoding.blog.board;


import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;

import java.util.Optional;

public interface BoardJPARepository extends JpaRepository<Board,Integer> {

    @Query("select b from Board b join fetch b.user where b.id = :id")
    Optional<Board> findByIdJoinUser(@Param("id") int id);

    @Query("select b from Board b join fetch b.user u left join fetch b.replies r where b.id = :id")
    Optional<Board> findByIdJoinUserAndReplies(@Param("id") int id);
}
UserRequest
package shop.mtcoding.blog.user;

import lombok.Data;

public class UserRequest {

    @Data
    public static class JoinDTO{
        private String username;
        private String password;
        private String email;

        public User toEntity(){
            return User.builder()
                    .username(username)
                    .password(password)
                    .email(email)
                    .build();
        }
    }

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

    @Data
    public static class UpdateDTO{
        private String password;
        private String email;
    }

}
UserService
package shop.mtcoding.blog.board;

import lombok.RequiredArgsConstructor;
import org.springframework.data.domain.Sort;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import shop.mtcoding.blog._core.err.exception.Exception403;
import shop.mtcoding.blog._core.err.exception.Exception404;

import shop.mtcoding.blog.user.User;

import java.util.List;

@RequiredArgsConstructor
@Service
public class BoardService {
    private final BoardJPARepository boardJPARepository;

    @Transactional
    public Board 글쓰기(BoardRequest.SaveDTO requestDTO, User sessionUser) {
      return  boardJPARepository.save(requestDTO.toEntity(sessionUser));
    }

    @Transactional
    public Board 글조회(int boardId, int sessionUserId) {
        //조회 및 예외처리
        Board board = boardJPARepository.findById(boardId)
                .orElseThrow(() -> new Exception404("게시글을 찾을 수 없습니다."));
        //권한 처리,
        if (sessionUserId != board.getUser().getId()) {
            throw new Exception403("게시글을 수정할 권한이 없습니다");
        }


        return board;
    }


    @Transactional
    public void 글삭제(int boardId, int sessionUserId) {
        Board board = boardJPARepository.findById(boardId).orElseThrow(() -> new Exception404("게시글을 찾을 수 없습니다."));
        if (sessionUserId != board.getUser().getId()) {
            throw new Exception403("게시글을 삭제할 권한이 없습니다");
        }// 트랜잭션은 런타임익셉션이 발동하면 롤백된다.
        boardJPARepository.deleteById(boardId);

    }

    public List<Board> 글목록조회() {
        Sort sort = Sort.by(Sort.Direction.DESC, "id");
        List<Board> boardList = boardJPARepository.findAll(sort);
        return boardList;
    }

    public Board 글상세보기(int boardId, User sessionUser) {
        Board board = boardJPARepository.findByIdJoinUser(boardId)
                .orElseThrow(() -> new Exception404("게시글을 찾을 수 없습니다"));

        boolean isBoardOwner = false;
        if (sessionUser != null) {
            if (sessionUser.getId() == board.getUser().getId()) {
                isBoardOwner = true;
            }
        }

        board.setBoardOwner(isBoardOwner);

        board.getReplies().forEach(reply ->{
            boolean isReplyOwner = false ;
            if(sessionUser!=null) {
                if (reply.getUser().getId() == sessionUser.getId()) {
                    isReplyOwner =true;
                }
            }
            reply.setReplyOwner(isReplyOwner);
        });

        return board;
    }

}
 

Reply

Reply
package shop.mtcoding.blog.reply;

import jakarta.persistence.*;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.hibernate.annotations.CreationTimestamp;
import shop.mtcoding.blog.board.Board;
import shop.mtcoding.blog.user.User;

import java.time.LocalDateTime;

@NoArgsConstructor  // 빈생성자가 필요
@Entity
@Data
@Table(name = "reply_tb")
public class Reply {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id ;

    private String comment;
    //user_id 로 테이블 만들어짐.
    @ManyToOne(fetch = FetchType.LAZY)
    private User user ;

    @ManyToOne(fetch = FetchType.LAZY)
    private Board board ;
    @CreationTimestamp
    private LocalDateTime createdAt;

    @Transient
    private boolean isReplyOwner;

    @Builder
    public Reply(int id, String comment, User user, Board board, LocalDateTime createdAt) {
        this.id = id;
        this.comment = comment;
        this.user = user;
        this.board = board;
        this.createdAt = createdAt;
    }

}
ReplyController
package shop.mtcoding.blog.reply;

import jakarta.servlet.http.HttpSession;
import lombok.RequiredArgsConstructor;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import shop.mtcoding.blog._core.util.ApiUtil;
import shop.mtcoding.blog.user.User;

@RequiredArgsConstructor
@Controller
public class ReplyController {
    private final ReplyService replyService ;
    private final HttpSession session;

    @PostMapping("/api/replies")
    public ResponseEntity<?> save(@RequestBody ReplyRequest.SaveDTO requestDTO){
        User sessionUser = (User) session.getAttribute("sessionUser");
         Reply reply = replyService.댓글쓰기(requestDTO,sessionUser);

        return ResponseEntity.ok(new ApiUtil(reply)) ;
    }

    @DeleteMapping("/api/replies/{id}")
    public ResponseEntity<?> delete(@RequestBody @PathVariable("id") Integer id){
        User sessionUser = (User) session.getAttribute("sessionUser");
        replyService.댓글삭제(id,sessionUser);

        return ResponseEntity.ok(new ApiUtil(null)) ;
    }

}
ReplyJPARepository
package shop.mtcoding.blog.reply;

import org.springframework.data.jpa.repository.JpaRepository;

public interface ReplyJPARepository extends JpaRepository<Reply,Integer> {}
ReplyRequest
package shop.mtcoding.blog.reply;

import lombok.Data;
import shop.mtcoding.blog.board.Board;
import shop.mtcoding.blog.user.User;

public class ReplyRequest {
    @Data
   public static class SaveDTO{
        private Integer boardId ;
        private String comment ;

        public Reply toEntity(User sessionUser, Board board) {
            return Reply.builder()
                    .comment(comment)
                    .board(board)
                    .user(sessionUser)
                    .build();
        }

    }
}
ReplyService
package shop.mtcoding.blog.reply;

import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import shop.mtcoding.blog._core.err.exception.Exception403;
import shop.mtcoding.blog._core.err.exception.Exception404;
import shop.mtcoding.blog.board.Board;
import shop.mtcoding.blog.board.BoardJPARepository;
import shop.mtcoding.blog.user.User;

@RequiredArgsConstructor
@Service
public class ReplyService {
    private final ReplyJPARepository replyJPARepository ;
    private final BoardJPARepository boardJPARepository ;

    @Transactional
    public Reply 댓글쓰기(ReplyRequest.SaveDTO requestDTO, User sessionUser) {
        Board  board = boardJPARepository.findById(requestDTO.getBoardId())
                .orElseThrow(() -> new Exception404("없는 게시글에 댓글을 작성할 수 없습니다."));
        Reply reply = requestDTO.toEntity(sessionUser,board);
        replyJPARepository.save(reply);
        return reply ;
    }

    @Transactional
    public int 댓글삭제(Integer replyId,User sessionUser){
        Reply reply = replyJPARepository.findById(replyId).orElseThrow(() -> new Exception404("댓글을 찾을 수 없습니다."));

        int boardId = reply.getBoard().getId(); // 댓글 삭제 전 게시글 번호 남겨놓음

        if(sessionUser.getId()!=reply.getUser().getId()){
            throw new  Exception403("댓글을 삭제할 권한이 없습니다.");
        }
        replyJPARepository.deleteById(replyId);
        return boardId;
    }
}
 

_core

config/WebMvcConfig
package shop.mtcoding.blog._core.config;


import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import shop.mtcoding.blog._core.interceptor.LoginInterceptor;

@Configuration // ioc 등록
public class WebMvcConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
            registry.addInterceptor(new LoginInterceptor())
                    .addPathPatterns("/api/**")
                    .excludePathPatterns("/api/boards/{id:\\d+}/detail");
    }


}
err/MyExeptionHandler
package shop.mtcoding.blog._core.err;

import jakarta.servlet.http.HttpServletRequest;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestController;
import shop.mtcoding.blog._core.err.exception.*;
import shop.mtcoding.blog._core.util.ApiUtil;

@RestControllerAdvice //runtimeException 이 터지만 해당 파일로 오류가 모인다.
public class MyExeptionHandler{

    @ExceptionHandler(Exception400.class)
    public ResponseEntity<?> ex400(RuntimeException e){

        ApiUtil<?> apiUtil = new ApiUtil<>(400,e.getMessage()); // http body 내부의 구성한 객체
        return new ResponseEntity<>(apiUtil, HttpStatus.BAD_REQUEST); // http header , http body
    }
    @ExceptionHandler(Exception401.class)
    public ResponseEntity<?> ex401(RuntimeException e){
        ApiUtil<?> apiUtil = new ApiUtil<>(401,e.getMessage()); // http body 내부의 구성한 객체
        return new ResponseEntity<>(apiUtil,HttpStatus.UNAUTHORIZED);
    }

    @ExceptionHandler(Exception403.class)
    public ResponseEntity<?> ex403(RuntimeException e){
        ApiUtil<?> apiUtil = new ApiUtil<>(403,e.getMessage()); // http body 내부의 구성한 객체
        return new ResponseEntity<>(apiUtil,HttpStatus.FORBIDDEN);
    }
    @ExceptionHandler(Exception404.class)
    public ResponseEntity<?> ex404(RuntimeException e){
        ApiUtil<?> apiUtil = new ApiUtil<>(404,e.getMessage()); // http body 내부의 구성한 객체

        return new ResponseEntity<>(apiUtil,HttpStatus.NOT_FOUND);
    }

    @ExceptionHandler(Exception500.class)
    public ResponseEntity<?> ex500(RuntimeException e){
        ApiUtil<?> apiUtil = new ApiUtil<>(500,e.getMessage()); // http body 내부의 구성한 객체
        return new ResponseEntity<>(apiUtil,HttpStatus.INTERNAL_SERVER_ERROR);
    }


}
err/exception/Exception400~500
package shop.mtcoding.blog._core.err.exception;

public class Exception400 extends RuntimeException{

    public Exception400(String msg) {
        super(msg);
    }
}
interceptor/LoginInterceptor
package shop.mtcoding.blog._core.interceptor;

import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.http.HttpSession;
import org.hibernate.query.sqm.mutation.internal.Handler;
import org.springframework.web.servlet.HandlerInterceptor;
import shop.mtcoding.blog._core.err.exception.Exception401;
import shop.mtcoding.blog.user.User;

public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("preHandler,,,,,,,,");
        HttpSession session = request.getSession();

        User sessionUser = (User) session.getAttribute("sessionUser");
        if(sessionUser ==null){
            throw new Exception401("로그인이 필요합니다.");
        }
        return true;
    }
}
util/ApiUtil
package shop.mtcoding.blog._core.util;

import lombok.Data;

@Data
public class ApiUtil<T> {
    private Integer status ; //200,400,404,405
    private String msg ; // 성공, 실패 -> 메세지  성공시에는 메세지 필요없음
    private T body ; // 타입이 정해져있지 않아 new 때 타입을 정하는 T로 정함

    //통신이 성공했을 때
    public ApiUtil(T body) {
        this.status = 200;
        this.msg ="성공";
        this.body = body;
    }
    //통신이 실패했을 때
    public ApiUtil(Integer status, String msg) {
        this.status = status;
        this.msg = msg;
        this.body=null;  // 실패 시에는 메세지와 상태코드만 필요하기 때문에 바디 데이터는 필요없다.
    }
}
 

1. 요청 BODY 수정

💡
요청 BODY에 @RequestBody 어노테이션 붙이기 Post 와 Put 매핑에 붙인다.
 
    @PutMapping("/api/users/{id}")
    public String update(@RequestBody UserRequest.UpdateDTO requestDTO){
        User sessionUser = (User) session.getAttribute("sessionUser");
        User user = userService.회원조회(sessionUser.getId(),requestDTO);
        session.setAttribute("sessionUser",user);
        return "redirect:/";
    }
 

2. 응답 BODY 수정

💡
응답은 ReposnseEntity.ok(new ApiUtil()) 를 사용한다.
 
 @RestController
public class UserController {

    private final UserService userService;
    private final HttpSession session;   
    
    
    
    @PutMapping("/api/users/{id}") //회원 수정은 세션 id 를 받기 때문에 주소에 id가 필요없다. 하지만 프론트 입장에선 필요하다. 또 관리자가 수정을 해야한다면 구분이 필요하다.
    public ResponseEntity<?> update(@RequestBody @PathVariable Integer id, UserRequest.UpdateDTO requestDTO){
        User sessionUser = (User) session.getAttribute("sessionUser");
        User newSessionUser = userService.회원조회(sessionUser.getId(),requestDTO);
        session.setAttribute("sessionUser",newSessionUser);
        
        return ResponseEntity.ok(new ApiUtil(newSessionUser));
    } 
  }
 
 
notion image
 
 
notion image
 
로그아웃 후 수정 요청을 하면 이렇게 뜬다.
 
 
notion image
 
로그인 완료
 
notion image
 
로그인 실패
 
 
    @PostMapping("/api/boards")
    public ResponseEntity<?> save(@RequestBody BoardRequest.SaveDTO requestDTO){
        User sessionUser = (User) session.getAttribute("sessionUser");
        Board board = boardService.글쓰기(requestDTO,sessionUser);
        return ResponseEntity.ok(new ApiUtil(board)) ;
    }
 
notion image
 
💡
제이슨으로 엔티티를 참조하면 엔티티 내부에 엔티티가 호출되면 무한순환 참조가 되면서 터진다. 그래서 DTO 가 필요하다.
 
 
    @GetMapping("/")
    public ResponseEntity<?> main(){
        List<Board> boardList = boardService.글목록조회();
        return  ResponseEntity.ok(new ApiUtil(boardList));
        //디스패쳐 서블릿은 오브젝트가 리턴되면, 메세지컨버터가 보드에 있는 애들을 getter로 제이슨으로 변환
        // GETuser를 하는 순간 없기 때문에 select 로 통신. 근데 화면에 그림을 그릴 때는 null 이기 때문에 터짐.
        // 메세지 컨버터가 기다린다면 괜찮음. 근데
    }
 
notion image
 
💡
DTO 서비스에서 안만들면 문제? 1. 커넥션의 시간이 길어진다. 2. 쓸데없는 필드를 응답하게 된다. 3. 메세지 컨버터에서 JSON 만들 때 HttpMessageConversionException 오류 터짐 해결법 - OPEN-IN-VIEW : false - 서비스 종료 직전 Lazy Loading 발동 시키기 - 서비스에서 DTO 를 만들어야 함.
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