[MVC 구현하기 - 1단계] 비버(전인표) 미션 제출합니다. (#337)

* test: ReflectionTest 작성

* test: ServletTest 작성

* feat: 패키지에 있는 클래스 handlerExecutions변수에 초기화

* refactor: 예외 처리를 위한 getDeclaredConstructor()메소드 추가

* refactor: 가독성을 위한 forEach문 제거

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

@@ -1,16 +1,18 @@
 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 org.reflections.Reflections;
+import web.org.springframework.web.bind.annotation.RequestMapping;
+import web.org.springframework.web.bind.annotation.RequestMethod;
 
+import java.lang.reflect.Method;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Set;
 
 public class AnnotationHandlerMapping {
 
-    private static final Logger log = LoggerFactory.getLogger(AnnotationHandlerMapping.class);
-
     private final Object[] basePackage;
     private final Map<HandlerKey, HandlerExecution> handlerExecutions;
 
@@ -19,11 +21,40 @@ public AnnotationHandlerMapping(final Object... basePackage) {
         this.handlerExecutions = new HashMap<>();
     }
 
+
     public void initialize() {
-        log.info("Initialized AnnotationHandlerMapping!");
+        getAnnotatedClasses().forEach(this::registerMethods);
+    }
+
+    private Set<Class<?>> getAnnotatedClasses() {
+        Reflections reflections = new Reflections(basePackage);
+        return reflections.getTypesAnnotatedWith(Controller.class);
+    }
+
+    private void registerMethods(final Class<?> clazz) {
+        for (Method method : clazz.getDeclaredMethods()) {
+            if (method.isAnnotationPresent(RequestMapping.class)) {
+                registerMethod(clazz, method);
+            }
+        }
+    }
+
+    private void registerMethod(final Class<?> clazz, final Method method) {
+        RequestMapping requestMapping = method.getAnnotation(RequestMapping.class);
+        final String value = requestMapping.value();
+        for (RequestMethod requestMethod : requestMapping.method()) {
+            handlerExecutions.put(
+                    new HandlerKey(value, requestMethod),
+                    new HandlerExecution(clazz, method));
+        }
     }
 
     public Object getHandler(final HttpServletRequest request) {
-        return null;
+        final HandlerKey handlerKey = new HandlerKey(request.getRequestURI(), RequestMethod.valueOf(request.getMethod()));
+        return handlerExecutions.keySet().stream()
+                .filter(handlerKey::equals)
+                .map(handlerExecutions::get)
+                .findFirst()
+                .orElseThrow(() -> new IllegalArgumentException("존재하지 않은 요청입니다."));
     }
 }

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

@@ -4,9 +4,19 @@
 import jakarta.servlet.http.HttpServletResponse;
 import webmvc.org.springframework.web.servlet.ModelAndView;
 
+import java.lang.reflect.Method;
+
 public class HandlerExecution {
+    private final Class<?> clazz;
+    private final Method method;
+
+    public HandlerExecution(Class<?> clazz, final Method method) {
+        this.clazz = clazz;
+        this.method = method;
+    }
 
     public ModelAndView handle(final HttpServletRequest request, final HttpServletResponse response) throws Exception {
-        return null;
+        final Object instance = clazz.getDeclaredConstructor().newInstance();
+        return (ModelAndView) method.invoke(instance, request, response);
     }
 }

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

@@ -10,6 +10,8 @@ public class CharacterEncodingFilter implements Filter {
 
     @Override
     public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
+        request.setCharacterEncoding("UTF-8");
+        response.setCharacterEncoding("UTF-8");
         request.getServletContext().log("doFilter() 호출");
         chain.doFilter(request, response);
     }

study/src/test/java/di/stage3/context/DIContainer.java

@@ -1,5 +1,6 @@
 package di.stage3.context;
 
+import java.util.HashSet;
 import java.util.Set;
 
 /**
@@ -10,11 +11,16 @@ class DIContainer {
     private final Set<Object> beans;
 
     public DIContainer(final Set<Class<?>> classes) {
-        this.beans = Set.of();
+        this.beans = Set.of(classes.toArray());
     }
 
     @SuppressWarnings("unchecked")
     public <T> T getBean(final Class<T> aClass) {
+        for (Object bean : beans) {
+            if (aClass.isAssignableFrom(bean.getClass())) {
+                return (T) bean;
+            }
+        }
         return null;
     }
 }

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

@@ -2,12 +2,23 @@
 
 import org.junit.jupiter.api.Test;
 
+import java.lang.reflect.Method;
+
 class Junit3TestRunner {
 
     @Test
     void run() throws Exception {
         Class<Junit3Test> clazz = Junit3Test.class;
 
-        // TODO Junit3Test에서 test로 시작하는 메소드 실행
+        // Junit3Test 클래스의 모든 메소드를 가져옵니다.
+        Method[] methods = clazz.getDeclaredMethods();
+
+        for (Method method : methods) {
+            String methodName = method.getName();
+            // 메소드 이름이 "test"로 시작하는 경우 실행합니다.
+            if (methodName.startsWith("test")) {
+                method.invoke(clazz.newInstance());
+            }
+        }
     }
 }

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

@@ -2,12 +2,21 @@
 
 import org.junit.jupiter.api.Test;
 
+import java.lang.reflect.Method;
+
 class Junit4TestRunner {
 
     @Test
     void run() throws Exception {
         Class<Junit4Test> clazz = Junit4Test.class;
 
         // TODO Junit4Test에서 @MyTest 애노테이션이 있는 메소드 실행
+        final Method[] declaredMethods = clazz.getDeclaredMethods();
+
+        for (final Method declaredMethod : declaredMethods) {
+            if (declaredMethod.isAnnotationPresent(MyTest.class)) {
+                declaredMethod.invoke(clazz.newInstance());
+            }
+        }
     }
 }

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

@@ -7,9 +7,13 @@
 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 java.util.stream.Collectors;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.InstanceOfAssertFactories.DATE;
 
 class ReflectionTest {
 
@@ -18,35 +22,39 @@ class ReflectionTest {
     @Test
     void givenObject_whenGetsClassName_thenCorrect() {
         final Class<Question> clazz = Question.class;
-
-        assertThat(clazz.getSimpleName()).isEqualTo("");
-        assertThat(clazz.getName()).isEqualTo("");
-        assertThat(clazz.getCanonicalName()).isEqualTo("");
+        System.out.println(clazz.getCanonicalName());
+        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)
@@ -56,20 +64,24 @@ 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);
     }
 
+
     @Test
     void givenClass_whenInstantiatesObjectsAtRuntime_thenCorrect() throws Exception {
         final Class<?> questionClass = Question.class;
 
-        final Constructor<?> firstConstructor = null;
-        final Constructor<?> secondConstructor = null;
+        final Constructor<?>[] constructors = questionClass.getDeclaredConstructors();
+
+        final Constructor<?> firstConstructor = constructors[0];
+        final Constructor<?> secondConstructor = constructors[1];
+
+        final Question firstQuestion = (Question) firstConstructor.newInstance("gugu", "제목1", "내용1");
 
-        final Question firstQuestion = null;
-        final Question secondQuestion = null;
+        final Question secondQuestion = (Question) secondConstructor.newInstance(1L, "gugu", "제목2", "내용2", new Date(), 3);
 
         assertThat(firstQuestion.getWriter()).isEqualTo("gugu");
         assertThat(firstQuestion.getTitle()).isEqualTo("제목1");
@@ -82,15 +94,15 @@ 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 +111,32 @@ 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.setInt(student, 99);
 
         assertThat(field.getInt(student)).isEqualTo(99);
         assertThat(student.getAge()).isEqualTo(99);

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

@@ -4,6 +4,11 @@
 import org.reflections.Reflections;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import reflection.annotation.Controller;
+import reflection.annotation.Repository;
+import reflection.annotation.Service;
+
+import java.util.Set;
 
 class ReflectionsTest {
 
@@ -14,5 +19,12 @@ 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<?>> annotatedClasses = reflections.getTypesAnnotatedWith(Controller.class, false);
+        annotatedClasses.addAll(reflections.getTypesAnnotatedWith(Service.class, false));
+        annotatedClasses.addAll(reflections.getTypesAnnotatedWith(Repository.class, false));
+
+        for (Class<?> annotatedClass : annotatedClasses) {
+            log.info("Annotated class: {}", annotatedClass.getName());
+        }
     }
 }

study/src/test/java/servlet/com/example/ServletTest.java

@@ -28,7 +28,7 @@ void testSharedCounter() {
 
         // expected를 0이 아닌 올바른 값으로 바꿔보자.
         // 예상한 결과가 나왔는가? 왜 이런 결과가 나왔을까?
-        assertThat(Integer.parseInt(response.body())).isEqualTo(0);
+        assertThat(Integer.parseInt(response.body())).isEqualTo(3);
     }
 
     @Test
@@ -50,6 +50,6 @@ void testLocalCounter() {
 
         // expected를 0이 아닌 올바른 값으로 바꿔보자.
         // 예상한 결과가 나왔는가? 왜 이런 결과가 나왔을까?
-        assertThat(Integer.parseInt(response.body())).isEqualTo(0);
+        assertThat(Integer.parseInt(response.body())).isEqualTo(1);
     }
 }