FrontController 도입 : v1

1. 프론트 컨트롤러 도입 v1

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2. Controller v1

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• 다형성 활용 위해 interface를 도입.
• 각Controller는 Controller interface를 구현함.
• Controller Interface

public interface ControllerV1 {

    void process(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException;

}

• MemberFormControllerV1 class

public class MemberFormControllerV1 implements ControllerV1 {

    @Override
    public void process(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String viewPath = "/WEB-INF/views/new-form.jsp";
        RequestDispatcher dispatcher = request.getRequestDispatcher(viewPath);
        dispatcher.forward(request, response); //이동!
    }
}

• MemberListControllerV1 class

public class MemberListControllerV1 implements ControllerV1 {

    private MemberRepository memberRepository = MemberRepository.getInstance();

    @Override
    public void process(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        List<Member> members = memberRepository.findAll();

        //모델에 담기
        request.setAttribute("members", members);

        String viewPath = "/WEB-INF/views/members.jps";
        RequestDispatcher dispatcher = request.getRequestDispatcher(viewPath);
        dispatcher.forward(request, response);
    }
}

• MemberSaveControllerV1 class

public class MemberSaveControllerV1 implements ControllerV1 {

    private MemberRepository memberRepository = MemberRepository.getInstance();

    @Override
    public void process(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String username = request.getParameter("username");
        int age = Integer.parseInt(request.getParameter("age"));

        Member member = new Member(username, age);
        memberRepository.save(member);

        //model에 data를 보관해보자.(K&V)
        request.setAttribute("member", member);

        String viewPath = "/WEB-INF/views/save-result.jsp";
        RequestDispatcher dispatcher = request.getRequestDispatcher(viewPath);
        dispatcher.forward(request, response);
    }
}

• FrontController
  • Servlet
  • Map을 활용하여 URI와 Controller를 매핑해둠.

@WebServlet(name = "FrontControllerServletV1", urlPatterns = "/front-controller/v1/*")
public class FrontControllerServletV1 extends HttpServlet {

    private Map<String, ControllerV1> controllerMap = new HashMap<>();

    public FrontControllerServletV1() {

        controllerMap.put("/front-controller/v1/members/new-form", new MemberFormControllerV1());
        controllerMap.put("/front-controller/v1/members/save", new MemberSaveControllerV1());
        controllerMap.put("/front-controller/v1/members", new MemberListControllerV1());
    }

    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        System.out.println("FrontControllerServletV1.service");

        String requestURI = request.getRequestURI();

        ControllerV1 controller = controllerMap.get(requestURI);
        if(controller == null){
            response.setStatus(HttpServletResponse.SC_NOT_FOUND);
            return;
        }

        controller.process(request, response);


    }
}

 

 

3.  GitHub : 210910 FrontController

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GitHub - bsh6463/MVC1