게시판 CRUD

<model>

@Data
@AllArgsConstructor
@NoArgsConstructor
@Builder
@Entity
public class Board { // 보드에 담길 내용: 제목, 내용, 댓글, (글은 나만 쓸 것이므로 유저정보는 필요 없음)

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String title;

    private String content;

    @CreationTimestamp
    private Timestamp createDate;
}

<repository>

public interface BoardRepository extends JpaRepository<Board, Long> {
}

<boardService>

@Service
public class BoardService { //게시글 작성(save), 삭제, 수정, 내용, 글 목록 불러오기         댓글 작성, 삭제, 수정

    private final BoardRepository boardRepository;

    public BoardService(BoardRepository boardRepository/*, UserRepository userRepository, ReplyRepository replyRepository*/) {
        this.boardRepository = boardRepository;
    }

    @Transactional //게시글 저장 PostMapping
    public Board boardSave (Board board) {
        return boardRepository.save(board);
    }

    @Transactional(readOnly = true) //글들을 리스트로 받아옴 -> 인덱스 페이지에 넣을 거임 GetMapping
    public Page<Board> boardAllList (Pageable pageable) {
        return boardRepository.findAll(pageable);
    }


    @Transactional(readOnly = true) //게시글 내용보기 GetMapping
    public Board boardContent (Long id) {
        return boardRepository.findById(id)
                .orElseThrow(()-> new IllegalArgumentException("이미 삭제된 게시글 입니다."));
    }

    @Transactional
    public Board boardUpdate (Long id, Board board) { //게시글 수정 PutMapping
        Board boardEntity = boardRepository.findById(id) //더티 체킹(DB가 변화를 감지해서 update문 실행)
                .orElseThrow(()-> new IllegalArgumentException("이미 삭제된 게시글 입니다."));
        boardEntity.setTitle(board.getTitle());
        boardEntity.setContent(board.getContent());
        return boardEntity;
    }

    @Transactional
    public String boardDelete (Long id) { //게시글 삭제 DeleteMapping
        boardRepository.deleteById(id);
        return "success delete!";
    }

<ResponseDto>

@AllArgsConstructor
@NoArgsConstructor
@Data
public class ResponseDto<T> { //controller로 부터 받은 데이터를 http상태와 함께 담음
    int status;
    T data;
}

<Controller>:데이터를 front로 넘길것임->restcontroller

@RequiredArgsConstructor
@RestController //react와 json객체를 주고 받을 것임
public class BoardController {

    private BoardService boardService;

    @Autowired
    public BoardController(BoardService boardService) {
        this.boardService = boardService;
    }

    @GetMapping("/board/{id}") //id로부터 게시글 data를 넘겨줌
    public ResponseDto<?> boardContent(@PathVariable Long id) {
        return new ResponseDto<> (HttpStatus.OK.value() , boardService.boardContent(id));
    }
}

@RequiredArgsConstructor
@RestController
public class BoardApiController { //게시글 작성(save), 삭제, 수정, 댓글 삭제, 수정, 작성

    private BoardService boardService;

    @Autowired
    public BoardApiController(BoardService boardService) {
        this.boardService = boardService;
    }

    @PostMapping("/api/board/save") //board의 내용을 입력받아서 저장하고 반환
    public ResponseDto<?> boardSave (@RequestBody Board board) {
        return new ResponseDto<>(HttpStatus.CREATED.value() , boardService.boardSave(board));
    }

    @PutMapping("/api/board/{id}/update") //저장된 board의 내용을 수정하고 반환
    public ResponseDto<?> boardUpdate (@PathVariable Long id, @RequestBody Board board) {
        return new ResponseDto<>(HttpStatus.OK.value(), boardService.boardUpdate(id, board));
    }

    @DeleteMapping("/api/board/{id}/delete") //저장된 board 삭제
    public ResponseDto<?> boardDelete (@PathVariable Long id) {
        return new ResponseDto<>(HttpStatus.OK.value(), boardService.boardDelete(id));
    }
}

<postman>(test도 공부..!)

boardCrud성공