feat: 일지 엔티티 구현(1차)

src/main/java/com/unit/daybook/domain/board/controller/BoardController.java

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+package com.unit.daybook.domain.board.controller;
+
+import com.unit.daybook.domain.board.dto.BoardAddReqDto;
+import com.unit.daybook.domain.board.dto.BoardAddResDto;
+import com.unit.daybook.domain.board.service.BoardService;
+import org.springframework.web.bind.annotation.*;
+
+@RequestMapping("/board")
+@RestController
+public class BoardController {
+
+    private final BoardService boardService;
+
+    public BoardController(BoardService boardService) {
+        this.boardService = boardService;
+    }
+    @GetMapping("/{boardId}")
+    public String getBoard(@PathVariable("boardId") Long boardId) {
+        return "단일 조회 정보 " + boardId;
+    }
+
+    @GetMapping("/boards")
+    public String getBoards() {
+        return "목록 조회 정보";
+    }
+
+
+    @PostMapping
+    public BoardAddResDto addBoard(@RequestBody BoardAddReqDto boardAddReqDto) {
+        Long memberId = 1L; // TODO 인증
+        return boardService.addBoard(boardAddReqDto, memberId);
+
+    }
+
+    @PostMapping("/{boardId}")
+    public String modifyBoard(@PathVariable("boardId") Long boardId) {
+        return "수정 성공";
+    }
+
+    @DeleteMapping("/{boardId}")
+    public String deleteBoard(@PathVariable("boardId") Long boardId) {
+        return "삭제 성공";
+    }
+}

src/main/java/com/unit/daybook/domain/board/dto/BoardAddReqDto.java

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+package com.unit.daybook.domain.board.dto;
+
+import com.unit.daybook.domain.board.entity.BoardEntity;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.Setter;
+
+@Setter
+@Getter
+@NoArgsConstructor
+public class BoardAddReqDto {
+    private String content;
+    private Long respectBoardId;
+
+
+    public BoardEntity toEntity() {
+        BoardEntity entity = new BoardEntity();
+        entity.setContent(content);
+        entity.setRespectBoardId(respectBoardId);
+        return entity;
+    }
+}

src/main/java/com/unit/daybook/domain/board/dto/BoardAddResDto.java

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+package com.unit.daybook.domain.board.dto;
+
+import com.unit.daybook.domain.board.entity.BoardEntity;
+import lombok.Builder;
+import lombok.Getter;
+
+import java.time.LocalDateTime;
+
+@Getter
+public class BoardAddResDto {
+    private Long boardId;
+    private String content;
+    private Long respectBoardId;
+    private LocalDateTime createdAt;
+
+    private LocalDateTime modifiedAt;
+
+    @Builder
+    public BoardAddResDto(BoardEntity entity) {
+        this.boardId = entity.getBoardId();
+        this.content = entity.getContent();
+        this.respectBoardId = entity.getRespectBoardId();
+        this.createdAt = null;
+        this.modifiedAt = null;
+    }
+
+}

src/main/java/com/unit/daybook/domain/board/entity/BoardEntity.java

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+package com.unit.daybook.domain.board.entity;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.Setter;
+
+@Setter
+@Getter
+@Table(name = "board")
+@Entity
+public class BoardEntity {
+
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    @Id
+    private Long boardId;
+
+    @Column
+    private String content;
+
+    @Column
+    private Long respectBoardId;
+
+
+
+}

src/main/java/com/unit/daybook/domain/board/repository/BoardRepository.java

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+package com.unit.daybook.domain.board.repository;
+
+import com.unit.daybook.domain.board.entity.BoardEntity;
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+@Repository
+public interface BoardRepository extends JpaRepository<BoardEntity, Long> {
+
+}

src/main/java/com/unit/daybook/domain/board/service/BoardService.java

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+package com.unit.daybook.domain.board.service;
+
+import com.unit.daybook.domain.board.dto.BoardAddReqDto;
+import com.unit.daybook.domain.board.dto.BoardAddResDto;
+import com.unit.daybook.domain.board.entity.BoardEntity;
+import com.unit.daybook.domain.board.repository.BoardRepository;
+import jakarta.transaction.Transactional;
+import org.springframework.stereotype.Service;
+
+@Service
+public class BoardService {
+    public BoardService(BoardRepository boardRepository) {
+        this.boardRepository = boardRepository;
+    }
+
+    private final BoardRepository boardRepository;
+
+    @Transactional
+    public BoardAddResDto addBoard(BoardAddReqDto boardAddReqDto, Long memberId) {
+        BoardEntity entity = boardRepository.save(boardAddReqDto.toEntity());
+        return BoardAddResDto.builder()
+                .entity(entity)
+                .build();
+    }
+}