java reflection - 리플렉션한 메소드 파라미터 분석

reflect/src/main/java/com/example/reflect/controller/UserController.java

@@ -1,17 +1,19 @@
 package com.example.reflect.controller;
 
 import com.example.reflect.anno.RequestMapping;
+import com.example.reflect.controller.dto.JoinDto;
+import com.example.reflect.controller.dto.LoginDto;
 
 public class UserController {
 
-    @RequestMapping("/join")
-    public String join(){
+    @RequestMapping("/user/join")
+    public String join(JoinDto dto){
         System.out.println("join() 함수 호출");
         return "/";
     }
 
-    @RequestMapping("/login")
-    public String login(){
+    @RequestMapping("/user/login")
+    public String login(LoginDto dto){
         System.out.println("login()함수 호출");
         return "/";
     }

reflect/src/main/java/com/example/reflect/controller/dto/JoinDto.java

@@ -0,0 +1,40 @@
+package com.example.reflect.controller.dto;
+
+public class JoinDto {
+    private String username;
+    private String password;
+    private String email;
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    @Override
+    public String toString() {
+        return "JoinDto{" +
+                "username='" + username + '\'' +
+                ", password='" + password + '\'' +
+                ", email='" + email + '\'' +
+                '}';
+    }
+}

reflect/src/main/java/com/example/reflect/controller/dto/LoginDto.java

@@ -0,0 +1,30 @@
+package com.example.reflect.controller.dto;
+
+public class LoginDto {
+    private String username;
+    private String password;
+
+    @Override
+    public String toString() {
+        return "LoginDto{" +
+                "username='" + username + '\'' +
+                ", password='" + password + '\'' +
+                '}';
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+}

reflect/src/main/java/com/example/reflect/filter/Dispatcher.java

@@ -10,6 +10,8 @@ import java.io.IOException;
 import java.lang.annotation.Annotation;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
+import java.lang.reflect.Parameter;
+import java.util.Enumeration;
 
 public class Dispatcher implements Filter {
 
@@ -50,14 +52,26 @@ public class Dispatcher implements Filter {
         for (Method method : methods) { // 메소드 갯수만큼 반복
             Annotation annotation = method.getDeclaredAnnotation(RequestMapping.class);
             RequestMapping requestMapping = (RequestMapping) annotation;
-            System.out.println(requestMapping.value());
+//            System.out.println(requestMapping.value());
 
             if(requestMapping.value().equals(endPoint)) {
                 try {
-                    String path = (String) method.invoke(userController);
+                    Parameter[] parameters = method.getParameters();
+                    String path = null;
+                    if(parameters.length != 0) {
+//                        System.out.println("parameters[0].getType() : " + parameters[0].getType());
+                        Object dtoInstance = parameters[0].getType().getConstructor().newInstance();
+//                        String username = request.getParameter("username");
+//                        String password = request.getParameter("password");
+//                        System.out.println(username + ", " + password);
+                        Enumeration<String> keys = request.getParameterNames(); // username, password
+                        // keys 값을 parameterName -> setParameterName 으로 변경
 
-                    RequestDispatcher dis = request.getRequestDispatcher(path);
-                    // 내부에서 실행하기 때문에 필터 안탐
+                        path = "/";
+                    } else {
+                        path = (String) method.invoke(userController);
+                    }
+                    RequestDispatcher dis = request.getRequestDispatcher(path); // 내부에서 실행하기 때문에 필터 안탐
                     dis.forward(request, response);
                 } catch (Exception e) {
                     e.printStackTrace();

reflect/src/main/java/com/example/reflect/model/User.java

@@ -0,0 +1,51 @@
+package com.example.reflect.model;
+
+public class User {
+
+    private int id;
+    private String username;
+    private String password;
+    private String email;
+
+    @Override
+    public String toString() {
+        return "User{" +
+                "id=" + id +
+                ", username='" + username + '\'' +
+                ", password='" + password + '\'' +
+                ", email='" + email + '\'' +
+                '}';
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+}