spring mvc : mvc 프레임워크 만들기 - model 추가

spring-mvc/servlet/src/main/java/com/example/servlet/web/frontcontroller/ModelView.java

@@ -0,0 +1,17 @@
+package com.example.servlet.web.frontcontroller;
+
+import lombok.Getter;
+import lombok.Setter;
+
+import java.util.HashMap;
+import java.util.Map;
+
+@Getter @Setter
+public class ModelView {
+    private String viewName;
+    private Map<String, Object> model = new HashMap<>();
+
+    public ModelView(String viewName) {
+        this.viewName = viewName;
+    }
+}

spring-mvc/servlet/src/main/java/com/example/servlet/web/frontcontroller/MyView.java

@@ -5,6 +5,7 @@ import javax.servlet.ServletException;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import java.io.IOException;
+import java.util.Map;
 
 public class MyView {
 
@@ -18,4 +19,14 @@ public class MyView {
         RequestDispatcher dispatcher = request.getRequestDispatcher(viewPath);
         dispatcher.forward(request, response);
     }
+
+    public void render(Map<String, Object> model, HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        modelToRequestAttribute(model, request);
+        RequestDispatcher dispatcher = request.getRequestDispatcher(viewPath);
+        dispatcher.forward(request, response);
+    }
+
+    private void modelToRequestAttribute(Map<String, Object> model, HttpServletRequest request) {
+        model.forEach(request::setAttribute);
+    }
 }

spring-mvc/servlet/src/main/java/com/example/servlet/web/frontcontroller/v3/ControllerV3.java

@@ -0,0 +1,10 @@
+package com.example.servlet.web.frontcontroller.v3;
+
+import com.example.servlet.web.frontcontroller.ModelView;
+
+import java.util.Map;
+
+public interface ControllerV3 {
+
+    ModelView process(Map<String, String> paramMap);
+}

spring-mvc/servlet/src/main/java/com/example/servlet/web/frontcontroller/v3/FrontControllerServletV3.java

@@ -0,0 +1,63 @@
+package com.example.servlet.web.frontcontroller.v3;
+
+import com.example.servlet.web.frontcontroller.ModelView;
+import com.example.servlet.web.frontcontroller.MyView;
+import com.example.servlet.web.frontcontroller.v3.controller.MemberFormControllerV3;
+import com.example.servlet.web.frontcontroller.v3.controller.MemberListControllerV3;
+import com.example.servlet.web.frontcontroller.v3.controller.MemberSaveControllerV3;
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+
+@WebServlet(name = "frontControllerServletV3", urlPatterns = "/front-controller/v3/*")
+public class FrontControllerServletV3 extends HttpServlet {
+
+    private final Map<String, ControllerV3> controllerMap = new HashMap<>();
+
+    // 요청 URI 와 controller 매핑
+    public FrontControllerServletV3() {
+        controllerMap.put("/front-controller/v3/members/new-form", new MemberFormControllerV3());
+        controllerMap.put("/front-controller/v3/members/save", new MemberSaveControllerV3());
+        controllerMap.put("/front-controller/v3/members", new MemberListControllerV3());
+    }
+
+    @Override
+    protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
+        String requestURI = request.getRequestURI(); // 요청 URI
+
+        ControllerV3 controller = controllerMap.get(requestURI);
+
+        if (controller == null) {
+            response.setStatus(HttpServletResponse.SC_NOT_FOUND);
+            return;
+        }
+
+        // paramMap
+        Map<String, String> paramMap = createParamMap(request);
+
+        ModelView mv = controller.process(paramMap);
+        String viewName = mv.getViewName(); // 논리 이름 new-form
+        MyView view = viewResolver(viewName); // 물리 이름
+
+        view.render(mv.getModel(), request, response);
+    }
+
+    // 논리 이름을 물리 이름으로 변환
+    private MyView viewResolver(String viewName) {
+        return new MyView("/WEB-INF/views/" + viewName + ".jsp");
+    }
+
+    // 넘어온 파라미터 값 꺼내기
+    private Map<String, String> createParamMap(HttpServletRequest request) {
+        Map<String, String> paramMap = new HashMap<>();
+        request.getParameterNames().asIterator()
+                .forEachRemaining(paramName -> paramMap.put(paramName, request.getParameter(paramName)));
+        return paramMap;
+    }
+}

spring-mvc/servlet/src/main/java/com/example/servlet/web/frontcontroller/v3/controller/MemberFormControllerV3.java

@@ -0,0 +1,14 @@
+package com.example.servlet.web.frontcontroller.v3.controller;
+
+import com.example.servlet.web.frontcontroller.ModelView;
+import com.example.servlet.web.frontcontroller.v3.ControllerV3;
+
+import java.util.Map;
+
+public class MemberFormControllerV3 implements ControllerV3 {
+    @Override
+    public ModelView process(Map<String, String> paramMap) {
+
+        return new ModelView("new-form");
+    }
+}

spring-mvc/servlet/src/main/java/com/example/servlet/web/frontcontroller/v3/controller/MemberListControllerV3.java

@@ -0,0 +1,22 @@
+package com.example.servlet.web.frontcontroller.v3.controller;
+
+import com.example.servlet.domain.member.Member;
+import com.example.servlet.domain.member.MemberRepository;
+import com.example.servlet.web.frontcontroller.ModelView;
+import com.example.servlet.web.frontcontroller.v3.ControllerV3;
+
+import java.util.List;
+import java.util.Map;
+
+public class MemberListControllerV3 implements ControllerV3 {
+
+    private final MemberRepository memberRepository = MemberRepository.getInstance();
+
+    @Override
+    public ModelView process(Map<String, String> paramMap) {
+        List<Member> members = memberRepository.findAll();
+        ModelView mv = new ModelView("members");
+        mv.getModel().put("members", members);
+        return mv;
+    }
+}

spring-mvc/servlet/src/main/java/com/example/servlet/web/frontcontroller/v3/controller/MemberSaveControllerV3.java

@@ -0,0 +1,26 @@
+package com.example.servlet.web.frontcontroller.v3.controller;
+
+import com.example.servlet.domain.member.Member;
+import com.example.servlet.domain.member.MemberRepository;
+import com.example.servlet.web.frontcontroller.ModelView;
+import com.example.servlet.web.frontcontroller.v3.ControllerV3;
+
+import java.util.Map;
+
+public class MemberSaveControllerV3 implements ControllerV3 {
+
+    private final MemberRepository memberRepository = MemberRepository.getInstance();
+
+    @Override
+    public ModelView process(Map<String, String> paramMap) {
+        String username = paramMap.get("username");
+        int age = Integer.parseInt(paramMap.get("age"));
+
+        Member member = new Member(username, age);
+        memberRepository.save(member);
+
+        ModelView mv = new ModelView("save-result");
+        mv.getModel().put("member", member);
+        return mv;
+    }
+}