[MVC 구현하기 - 1단계] 쥬니(전정준) 미션 제출합니다.

mvc/src/main/java/webmvc/org/springframework/web/servlet/mvc/tobe/AnnotationHandlerMapping.java

@@ -1,15 +1,27 @@
 package webmvc.org.springframework.web.servlet.mvc.tobe;
 
+import context.org.springframework.stereotype.Controller;
 import jakarta.servlet.http.HttpServletRequest;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
+import jakarta.servlet.http.HttpServletResponse;
+import java.lang.reflect.Method;
+import java.util.Arrays;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
+import java.util.Set;
+import java.util.stream.Collectors;
+import org.reflections.Reflections;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import web.org.springframework.web.bind.annotation.RequestMapping;
+import web.org.springframework.web.bind.annotation.RequestMethod;
+import webmvc.org.springframework.web.servlet.ModelAndView;
 
 public class AnnotationHandlerMapping {
 
     private static final Logger log = LoggerFactory.getLogger(AnnotationHandlerMapping.class);
+    private static final int REQUEST_INDEX = 0;
+    private static final int RESPONSE_INDEX = 1;
 
     private final Object[] basePackage;
     private final Map<HandlerKey, HandlerExecution> handlerExecutions;
@@ -20,10 +32,73 @@ public AnnotationHandlerMapping(final Object... basePackage) {
     }
 
     public void initialize() {
+        Set<Class<?>> controllerClasses = findClassesAnnotatedController();
+
+        initializeHandlerExecutions(controllerClasses);
+
         log.info("Initialized AnnotationHandlerMapping!");
     }
 
+    private Set<Class<?>> findClassesAnnotatedController() {
+        Reflections reflections = new Reflections(basePackage);
+
+        return reflections.getTypesAnnotatedWith(Controller.class);
+    }
+
+    private void initializeHandlerExecutions(Set<Class<?>> controllerClasses) {
+        controllerClasses.forEach(controlerClass -> {
+            List<Method> methods = extractMethods(controlerClass);
+
+            initializeHandlerExecutionsByMethods(methods);
+        });
+    }
+
+    private List<Method> extractMethods(Class<?> controllerClasses) {
+        return Arrays.stream(controllerClasses.getDeclaredMethods())
+                .filter(method -> method.isAnnotationPresent(RequestMapping.class))
+                .filter(method -> method.getReturnType().equals(ModelAndView.class))
+                .filter(method -> validateParameterType(method.getParameterTypes()))
+                .collect(Collectors.toList());
+    }
+
+    private boolean validateParameterType(Class<?>[] parameters) {
+        return parameters[REQUEST_INDEX].equals(HttpServletRequest.class) &&
+                parameters[RESPONSE_INDEX].equals(HttpServletResponse.class);
+    }
+
+    private void initializeHandlerExecutionsByMethods(List<Method> methods) {
+        methods.forEach(this::setupHandlerExecutions);
+    }
+
+    private void setupHandlerExecutions(Method method) {
+        RequestMapping requestMappingAnnotation = method.getAnnotation(RequestMapping.class);
+        String url = requestMappingAnnotation.value();
+        RequestMethod[] requestMethods = requestMappingAnnotation.method();
+
+        try {
+            for (RequestMethod requestMethod : requestMethods) {
+                HandlerKey handlerKey = new HandlerKey(url, requestMethod);
+                Object classInstance = extractClassInstance(method);
+                HandlerExecution handlerExecution = new HandlerExecution(method, classInstance);
+
+                handlerExecutions.put(handlerKey, handlerExecution);
+            }
+        } catch (Exception e) {
+            log.error("ERROR : {}", e.getMessage());
+        }
+    }
+
+    private Object extractClassInstance(Method method) throws Exception {
+        Class<?> declaringClassForMethod = method.getDeclaringClass();
+
+        return declaringClassForMethod.getDeclaredConstructor().newInstance();
+    }
+
     public Object getHandler(final HttpServletRequest request) {
-        return null;
+        String uri = request.getRequestURI();
+        RequestMethod method = RequestMethod.valueOf(request.getMethod());
+
+        return handlerExecutions.get(new HandlerKey(uri, method));
     }
+
 }

mvc/src/main/java/webmvc/org/springframework/web/servlet/mvc/tobe/HandlerExecution.java

@@ -2,11 +2,21 @@
 
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
+import java.lang.reflect.Method;
 import webmvc.org.springframework.web.servlet.ModelAndView;
 
 public class HandlerExecution {
 
+    private final Method handler;
+    private final Object object;
+
+    public HandlerExecution(Method handler, Object object) {
+        this.handler = handler;
+        this.object = object;
+    }
+
     public ModelAndView handle(final HttpServletRequest request, final HttpServletResponse response) throws Exception {
-        return null;
+        return (ModelAndView) handler.invoke(object, request, response);
     }
+
 }

study/src/main/java/servlet/com/example/CharacterEncodingFilter.java

@@ -1,16 +1,21 @@
 package servlet.com.example;
 
-import jakarta.servlet.*;
+import jakarta.servlet.Filter;
+import jakarta.servlet.FilterChain;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.ServletRequest;
+import jakarta.servlet.ServletResponse;
 import jakarta.servlet.annotation.WebFilter;
-
 import java.io.IOException;
 
 @WebFilter("/*")
 public class CharacterEncodingFilter implements Filter {
 
     @Override
-    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
+    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
+            throws IOException, ServletException {
         request.getServletContext().log("doFilter() 호출");
+        response.setCharacterEncoding("UTF-8");
         chain.doFilter(request, response);
     }
 }

study/src/test/java/reflection/Junit3TestRunner.java

@@ -1,5 +1,9 @@
 package reflection;
 
+import java.lang.reflect.Method;
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
 import org.junit.jupiter.api.Test;
 
 class Junit3TestRunner {
@@ -9,5 +13,15 @@ void run() throws Exception {
         Class<Junit3Test> clazz = Junit3Test.class;
 
         // TODO Junit3Test에서 test로 시작하는 메소드 실행
+        Junit3Test junit3Test = new Junit3Test();
+        Method[] methods = clazz.getMethods();
+
+        List<Method> methodsStartWithTest = Arrays.stream(methods)
+                .filter(method -> method.getName().startsWith("test"))
+                .collect(Collectors.toList());
+
+        for (Method method : methodsStartWithTest) {
+            method.invoke(junit3Test);
+        }
     }
 }

study/src/test/java/reflection/Junit4TestRunner.java

@@ -1,5 +1,9 @@
 package reflection;
 
+import java.lang.reflect.Method;
+import java.util.Arrays;
+import java.util.List;
+import java.util.stream.Collectors;
 import org.junit.jupiter.api.Test;
 
 class Junit4TestRunner {
@@ -9,5 +13,15 @@ void run() throws Exception {
         Class<Junit4Test> clazz = Junit4Test.class;
 
         // TODO Junit4Test에서 @MyTest 애노테이션이 있는 메소드 실행
+        Junit4Test junit4Test = new Junit4Test();
+
+        Method[] methods = clazz.getMethods();
+        List<Method> methodsWithMyTestAnnotation = Arrays.stream(methods)
+                .filter(method -> method.isAnnotationPresent(MyTest.class))
+                .collect(Collectors.toList());
+
+        for (Method method : methodsWithMyTestAnnotation) {
+            method.invoke(junit4Test);
+        }
     }
 }

study/src/test/java/reflection/ReflectionTest.java

@@ -1,15 +1,17 @@
 package reflection;
 
-import org.junit.jupiter.api.Test;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
+import static org.assertj.core.api.Assertions.assertThat;
 
 import java.lang.reflect.Constructor;
 import java.lang.reflect.Field;
 import java.lang.reflect.Method;
+import java.util.Arrays;
+import java.util.Date;
 import java.util.List;
-
-import static org.assertj.core.api.Assertions.assertThat;
+import java.util.stream.Collectors;
+import org.junit.jupiter.api.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 class ReflectionTest {
 
@@ -19,34 +21,38 @@ class ReflectionTest {
     void givenObject_whenGetsClassName_thenCorrect() {
         final Class<Question> clazz = Question.class;
 
-        assertThat(clazz.getSimpleName()).isEqualTo("");
-        assertThat(clazz.getName()).isEqualTo("");
-        assertThat(clazz.getCanonicalName()).isEqualTo("");
+        assertThat(clazz.getSimpleName()).isEqualTo("Question");
+        assertThat(clazz.getName()).isEqualTo("reflection.Question");
+        assertThat(clazz.getCanonicalName()).isEqualTo("reflection.Question");
     }
 
     @Test
     void givenClassName_whenCreatesObject_thenCorrect() throws ClassNotFoundException {
         final Class<?> clazz = Class.forName("reflection.Question");
 
-        assertThat(clazz.getSimpleName()).isEqualTo("");
-        assertThat(clazz.getName()).isEqualTo("");
-        assertThat(clazz.getCanonicalName()).isEqualTo("");
+        assertThat(clazz.getSimpleName()).isEqualTo("Question");
+        assertThat(clazz.getName()).isEqualTo("reflection.Question");
+        assertThat(clazz.getCanonicalName()).isEqualTo("reflection.Question");
     }
 
     @Test
     void givenObject_whenGetsFieldNamesAtRuntime_thenCorrect() {
         final Object student = new Student();
-        final Field[] fields = null;
-        final List<String> actualFieldNames = null;
+        final Field[] fields = student.getClass().getDeclaredFields();
+        final List<String> actualFieldNames = Arrays.stream(fields)
+                .map(Field::getName)
+                .collect(Collectors.toList());
 
         assertThat(actualFieldNames).contains("name", "age");
     }
 
     @Test
     void givenClass_whenGetsMethods_thenCorrect() {
         final Class<?> animalClass = Student.class;
-        final Method[] methods = null;
-        final List<String> actualMethods = null;
+        final Method[] methods = animalClass.getDeclaredMethods();
+        final List<String> actualMethods = Arrays.stream(methods)
+                .map(Method::getName)
+                .collect(Collectors.toList());
 
         assertThat(actualMethods)
                 .hasSize(3)
@@ -56,7 +62,7 @@ void givenClass_whenGetsMethods_thenCorrect() {
     @Test
     void givenClass_whenGetsAllConstructors_thenCorrect() {
         final Class<?> questionClass = Question.class;
-        final Constructor<?>[] constructors = null;
+        final Constructor<?>[] constructors = questionClass.getDeclaredConstructors();
 
         assertThat(constructors).hasSize(2);
     }
@@ -65,11 +71,14 @@ void givenClass_whenGetsAllConstructors_thenCorrect() {
     void givenClass_whenInstantiatesObjectsAtRuntime_thenCorrect() throws Exception {
         final Class<?> questionClass = Question.class;
 
-        final Constructor<?> firstConstructor = null;
-        final Constructor<?> secondConstructor = null;
+        final Constructor<?> firstConstructor = questionClass.getConstructor(String.class, String.class, String.class);
+        final Constructor<?> secondConstructor = questionClass.getConstructor(
+                long.class, String.class, String.class, String.class, Date.class, int.class
+        );
 
-        final Question firstQuestion = null;
-        final Question secondQuestion = null;
+        final Question firstQuestion = (Question) firstConstructor.newInstance("gugu", "제목1", "내용1");
+        final Question secondQuestion = (Question) secondConstructor.newInstance(1, "gugu", "제목2", "내용2", new Date(),
+                0);
 
         assertThat(firstQuestion.getWriter()).isEqualTo("gugu");
         assertThat(firstQuestion.getTitle()).isEqualTo("제목1");
@@ -82,15 +91,15 @@ void givenClass_whenInstantiatesObjectsAtRuntime_thenCorrect() throws Exception
     @Test
     void givenClass_whenGetsPublicFields_thenCorrect() {
         final Class<?> questionClass = Question.class;
-        final Field[] fields = null;
+        final Field[] fields = questionClass.getFields();
 
         assertThat(fields).hasSize(0);
     }
 
     @Test
     void givenClass_whenGetsDeclaredFields_thenCorrect() {
         final Class<?> questionClass = Question.class;
-        final Field[] fields = null;
+        final Field[] fields = questionClass.getDeclaredFields();
 
         assertThat(fields).hasSize(6);
         assertThat(fields[0].getName()).isEqualTo("questionId");
@@ -99,31 +108,32 @@ void givenClass_whenGetsDeclaredFields_thenCorrect() {
     @Test
     void givenClass_whenGetsFieldsByName_thenCorrect() throws Exception {
         final Class<?> questionClass = Question.class;
-        final Field field = null;
+        final Field field = questionClass.getDeclaredField("questionId");
 
         assertThat(field.getName()).isEqualTo("questionId");
     }
 
     @Test
     void givenClassField_whenGetsType_thenCorrect() throws Exception {
         final Field field = Question.class.getDeclaredField("questionId");
-        final Class<?> fieldClass = null;
+        final Class<?> fieldClass = field.getType();
 
         assertThat(fieldClass.getSimpleName()).isEqualTo("long");
     }
 
     @Test
     void givenClassField_whenSetsAndGetsValue_thenCorrect() throws Exception {
         final Class<?> studentClass = Student.class;
-        final Student student = null;
-        final Field field = null;
+        final Student student = new Student();
+        final Field field = studentClass.getDeclaredField("age");
 
         // todo field에 접근 할 수 있도록 만든다.
+        field.setAccessible(true);
 
         assertThat(field.getInt(student)).isZero();
         assertThat(student.getAge()).isZero();
 
-        field.set(null, null);
+        field.set(student, 99);
 
         assertThat(field.getInt(student)).isEqualTo(99);
         assertThat(student.getAge()).isEqualTo(99);

study/src/test/java/reflection/ReflectionsTest.java

@@ -1,9 +1,13 @@
 package reflection;
 
+import java.util.Set;
 import org.junit.jupiter.api.Test;
 import org.reflections.Reflections;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import reflection.annotation.Controller;
+import reflection.annotation.Repository;
+import reflection.annotation.Service;
 
 class ReflectionsTest {
 
@@ -14,5 +18,20 @@ void showAnnotationClass() throws Exception {
         Reflections reflections = new Reflections("reflection.examples");
 
         // TODO 클래스 레벨에 @Controller, @Service, @Repository 애노테이션이 설정되어 모든 클래스 찾아 로그로 출력한다.
+        Set<Class<?>> classesWithController = reflections.getTypesAnnotatedWith(Controller.class);
+        for (Class<?> classWithController : classesWithController) {
+            log.info("Controller : {}", classWithController.getSimpleName());
+        }
+
+        Set<Class<?>> classesWithService = reflections.getTypesAnnotatedWith(Service.class);
+        for (Class<?> classWithService : classesWithService) {
+            log.info("Service : {}", classWithService.getSimpleName());
+        }
+
+        Set<Class<?>> classesWithRepository = reflections.getTypesAnnotatedWith(Repository.class);
+        for (Class<?> classWithRepository : classesWithRepository) {
+            log.info("Repository : {}", classWithRepository.getSimpleName());
+        }
+
     }
 }