V3는 잘 설계되었지만 항상 ModelView를 생성하고 반환해야 해서 번거롭다. 좋은 프레임워크는 아키텍처도 중요하지만 개발자가 쉽게 사용할 수 있어야 한다.
기본 구조는 V3와 같지만 컨트롤러가 ModelView 대신 ViewName만 반환한다.
컨트롤러는 ViewName만 반환한다.
프론트 컨트롤러는 컨트롤러에 paramMap과 model을 함께 넘긴다.
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public interface ControllerV4 {
/**
*
* @param paramMap
* @param model
* @return
*/
String process(Map<String, String> paramMap, Map<String, Object> model);
}public class MemberFormControllerV4 implements ControllerV4 {
@Override
public String process(Map<String, String> paramMap, Map<String, Object> model) {
return "new-form";
}
}public class MemberSaveControllerV4 implements ControllerV4 {
private MemberRepository memberRepository = MemberRepository.getInstance();
@Override
public String process(Map<String, String> paramMap, Map<String, Object> model) {
String username = paramMap.get("username");
int age = Integer.parseInt(paramMap.get("age"));
Member member = new Member(username, age);
memberRepository.save(member);
model.put("member", member);
return "save-result";
}
}public class MemberListControllerV4 implements ControllerV4 {
private MemberRepository memberRepository = MemberRepository.getInstance();
@Override
public String process(Map<String, String> paramMap, Map<String, Object> model) {
List<Member> members = memberRepository.findAll();
model.put("members", members);
return "members";
}
}@WebServlet(name = "frontControllerServletV4", urlPatterns = "/front-controller/V4/*")
public class FrontControllerServletV4 extends HttpServlet {
...
@Override
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
...
Map<String, String> paramMap = createParamMap(request);
Map<String, Object> model = new HashMap<>();
String viewName = controller.process(paramMap, model);
MyView myView = viewResolver(viewName);
// 이젠 직접 모델을 제공하므로 모델 뷰에서 모델을 꺼낼 필요가 없다.
myView.render(model, request, response);
}
...
}