[SpringBoot/IntelliJ] MVC구조 ( 게시판 예제 )

웹 애플리케이션 계층 구조

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@Controller : 웹 MVC의 컨트롤러 역할

@Controller
public class HomeController {

    private final MainBoardService mainBoardService;

    @Autowired
    public HomeController(MainBoardService mainBoardService) {
        this.mainBoardService = mainBoardService;
    }

    @GetMapping("/mainProductBoard")
    public String list(Model model){
        List<MainBoard> mainBoardList = mainBoardService.mainBoard();
        model.addAttribute("mainproducts",mainBoardList);
        return "boards/board";
    }

/mainProductBoard get요청이 되면 return이

resources / templates / boards / board 로 이동한다

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@Service : 핵심 비즈니스 로직 구현

스프링의 Service 인터페이스와 구현 클래스 패키지

CRUD등 비즈니스 단 기능들이 수행됨

Repository를 거쳐 DB에 접근

@Service
@Transactional
public class MainBoardService {

    private final MainBoardRepository mainBoardRepository;

    public MainBoardService(MainBoardRepository mainBoardRepository) {
        this.mainBoardRepository = mainBoardRepository;
    }

    /**
     * 게시글 등록
     */
    public int Insert(MainBoard mainBoard){
        mainBoardRepository.Insert(mainBoard);
        return mainBoard.getMainProductId();
    }

    public List<MainBoard> mainBoard(){
        return mainBoardRepository.findAll();
    }

    public Optional<MainBoard> findOne(int mainProductId){
        return mainBoardRepository.findBoard(mainProductId);
    }

    public int removeOne(MainBoard mainBoard){
        mainBoardRepository.delBoard(mainBoard);
        return mainBoard.getMainProductId();
    }

 

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@Repository : 데이터베이스에 접근, 도메인 객체를 DB에 저장하고 관리

public interface MainBoardRepository {
    List<MainBoard> findAll();
    MainBoard Insert(MainBoard mainBoard);
    Optional<MainBoard> findBoard(int mainProductId);
    MainBoard delBoard(MainBoard mainBoard);
}

repository는 interface로 만들고

 

public class JpaMainBoardRepository implements MainBoardRepository{

    private final EntityManager em;

    public JpaMainBoardRepository(EntityManager em) {
        this.em = em;
    }

    @Override
    public List<MainBoard> findAll() {
        return em.createQuery("select m from MainBoard m order by m.mainProductId desc", MainBoard.class)   //MainBoard Entity에 query 하는것, m = as m
                .getResultList();
    }

    @Override
    public MainBoard Insert(MainBoard mainBoard) {
        em.persist(mainBoard);
        return mainBoard;
    }

    //Optional 반환형 사용 (Null값 처리에 용이)
    @Override
    public Optional<MainBoard> findBoard(int mainProductId) {
        MainBoard mainBoard = em.find(MainBoard.class,mainProductId);
        return Optional.ofNullable(mainBoard);
    }

    @Override
    public MainBoard delBoard(MainBoard mainBoard) {
        em.remove(mainBoard);
        return mainBoard;
    }
    }

상속받아 JPA repository를 사용한다

EntityManager를 사용한다

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@Domain : 비즈니스 도메인 객체, ex) 회원,주문,쿠폰 등등 주로 데이터베이스에 저장하고 관리됨

VO, DTO 클래스들의 패키지

 

@Entity
@Table(name="mainproduct")
public class MainBoard {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY) // PK
    @Column(name="mainProductId")
    private int mainProductId;
    @Column(name = "mainProductTitle")
    private String mainProductTitle;
    @Column(name = "mainProductContent")
    private String mainProductContent;
    @Column(name = "mainProductHit")
    private int mainProductHit;
    @Column(name = "mainProductDate")
    private String mainProductDate;
    @Column(name = "mainProductCategory")
    private String mainProductCategory;

    public String getMainProductCategory() {
        return mainProductCategory;
    }

    public void setMainProductCategory(String mainProductCatagory) {
        this.mainProductCategory = mainProductCatagory;
    }

    public int getMainProductId() {
        return mainProductId;
    }

    public void setMainProductId(int mainProductId) {
        this.mainProductId = mainProductId;
    }

    public String getMainProductTitle() {
        return mainProductTitle;
    }

    public void setMainProductTitle(String mainProductTitle) {
        this.mainProductTitle = mainProductTitle;
    }

    public String getMainProductContent() {
        return mainProductContent;
    }

    public void setMainProductContent(String mainProductContent) {
        this.mainProductContent = mainProductContent;
    }

    public int getMainProductHit() {
        return mainProductHit;
    }

    public void setMainProductHit(int mainProductHit) {
        this.mainProductHit = mainProductHit;
    }

    public String getMainProductDate() {
        return mainProductDate;
    }

    public void setMainProductDate(String mainProductDate) {
        this.mainProductDate = mainProductDate;
    }
}

mainproduct 테이블의 column들을 작성하고

getter/setter를 정의했다