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haerong22
2021-09-13 10:51:59 +09:00
parent 59642a8198
commit 98c7aedc01
72 changed files with 1 additions and 0 deletions
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50
blog/dispatcher-servlet/pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>dispatcher-servlet</artifactId>
<version>1.0-SNAPSHOT</version>
<name>dispatcher-servlet</name>
<packaging>war</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.target>1.8</maven.compiler.target>
<maven.compiler.source>1.8</maven.compiler.source>
<junit.version>5.7.1</junit.version>
</properties>
<dependencies>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.3.1</version>
</plugin>
</plugins>
</build>
</project>

15
blog/dispatcher-servlet/src/main/java/com/example/dispatcherservlet/HelloController.java Normal file
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package com.example.dispatcherservlet;
import com.example.dispatcherservlet.annotation.Controller;
import com.example.dispatcherservlet.annotation.RequestMapping;
import com.example.dispatcherservlet.annotation.ResponseBody;
@Controller
public class HelloController {
@ResponseBody
@RequestMapping("/hello")
public String hello() {
return "hello";
}
}

20
blog/dispatcher-servlet/src/main/java/com/example/dispatcherservlet/TestController.java Normal file
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package com.example.dispatcherservlet;
import com.example.dispatcherservlet.annotation.Controller;
import com.example.dispatcherservlet.annotation.RequestMapping;
import com.example.dispatcherservlet.annotation.ResponseBody;
@Controller
public class TestController {
@ResponseBody
@RequestMapping("/hi")
public String hi() {
return "hi";
}
@RequestMapping("/main")
public String main() {
return "main.jsp";
}
}

11
blog/dispatcher-servlet/src/main/java/com/example/dispatcherservlet/annotation/Controller.java Normal file
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package com.example.dispatcherservlet.annotation;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface Controller {
}

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blog/dispatcher-servlet/src/main/java/com/example/dispatcherservlet/annotation/RequestMapping.java Normal file
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package com.example.dispatcherservlet.annotation;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface RequestMapping {
String value() default "";
}

11
blog/dispatcher-servlet/src/main/java/com/example/dispatcherservlet/annotation/ResponseBody.java Normal file
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package com.example.dispatcherservlet.annotation;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface ResponseBody {
}

78
blog/dispatcher-servlet/src/main/java/com/example/dispatcherservlet/springmvc/DispatcherServlet.java Normal file
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package com.example.dispatcherservlet.springmvc;
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.List;
import java.util.Map;
@WebServlet(name = "dispatcherServlet", urlPatterns = "/")
public class DispatcherServlet extends HttpServlet {
private List<ViewResolver> viewResolvers;
private List<HandlerAdapter> handlerAdapters;
private Map<String, MappingRegistry> handlerMapping;
public DispatcherServlet() {
WebApplicationContext resources = WebApplicationContext.getInstance();
this.viewResolvers = resources.getViewResolvers();
this.handlerMapping = resources.getHandlerMapping();
this.handlerAdapters = resources.getHandlerAdapters();
}
@Override
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
try {
MappingRegistry handler = getHandler(request);
if (handler != null) {
HandlerAdapter handlerAdapter = getHandlerAdapter(handler);
if (handlerAdapter != null) {
String result = handlerAdapter.handle(request, response, handler);
if (result != null) {
render(request, response, result);
}
}
} else {
request.getRequestDispatcher("/404.jsp").forward(request, response);
}
} catch (Exception e) {
e.printStackTrace();
}
}
private MappingRegistry getHandler(HttpServletRequest request) {
return handlerMapping.get(request.getRequestURI());
}
private HandlerAdapter getHandlerAdapter(MappingRegistry handler) {
for (HandlerAdapter handlerAdapter : handlerAdapters) {
if (handlerAdapter.supports(handler.getHandler())) {
return handlerAdapter;
}
}
return null;
}
private void render(HttpServletRequest request, HttpServletResponse response, String result) throws Exception {
View view = resolveViewName(result);
if (view != null) {
view.render(request, response, result);
}
}
private View resolveViewName(String path) throws Exception {
for (ViewResolver viewResolver : viewResolvers) {
View view = viewResolver.resolveViewName(path);
if (view != null) {
return view;
}
}
return null;
}
}

11
blog/dispatcher-servlet/src/main/java/com/example/dispatcherservlet/springmvc/HandlerAdapter.java Normal file
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package com.example.dispatcherservlet.springmvc;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public interface HandlerAdapter {
boolean supports(Object handler);
String handle(HttpServletRequest request, HttpServletResponse response, MappingRegistry handler);
}

17
blog/dispatcher-servlet/src/main/java/com/example/dispatcherservlet/springmvc/InternalResourceView.java Normal file
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package com.example.dispatcherservlet.springmvc;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class InternalResourceView implements View {
@Override
public void render(HttpServletRequest request, HttpServletResponse response, String path) {
try {
request.getRequestDispatcher(path).forward(request, response);
} catch (ServletException | IOException e) {
e.printStackTrace();
}
}
}

10
blog/dispatcher-servlet/src/main/java/com/example/dispatcherservlet/springmvc/InternalResourceViewResolver.java Normal file
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package com.example.dispatcherservlet.springmvc;
public class InternalResourceViewResolver implements ViewResolver{
@Override
public View resolveViewName(String viewName) {
return viewName.endsWith(".jsp") ? new InternalResourceView() : null;
}
}

25
blog/dispatcher-servlet/src/main/java/com/example/dispatcherservlet/springmvc/MappingRegistry.java Normal file
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package com.example.dispatcherservlet.springmvc;
import java.lang.reflect.Method;
public class MappingRegistry {
private Object handler;
private Method method;
public MappingRegistry() {
}
public MappingRegistry(Object handler, Method method) {
this.handler = handler;
this.method = method;
}
public Object getHandler() {
return handler;
}
public Method getMethod() {
return method;
}
}

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blog/dispatcher-servlet/src/main/java/com/example/dispatcherservlet/springmvc/RequestMappingHandlerAdapter.java Normal file
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package com.example.dispatcherservlet.springmvc;
import com.example.dispatcherservlet.annotation.Controller;
import com.example.dispatcherservlet.annotation.ResponseBody;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public class RequestMappingHandlerAdapter implements HandlerAdapter {
@Override
public boolean supports(Object handler) {
return handler.getClass().isAnnotationPresent(Controller.class);
}
@Override
public String handle(HttpServletRequest request, HttpServletResponse response, MappingRegistry handler) {
Object result = null;
try {
Method method = handler.getMethod();
result = method.invoke(handler.getHandler());
if (method.isAnnotationPresent(ResponseBody.class)) {
if (result instanceof String) {
response.setContentType("text/plain");
response.getWriter().println(result);
}
return null;
}
} catch (InvocationTargetException | IllegalAccessException | IOException e) {
e.printStackTrace();
}
return (String) result;
}
}

9
blog/dispatcher-servlet/src/main/java/com/example/dispatcherservlet/springmvc/View.java Normal file
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package com.example.dispatcherservlet.springmvc;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public interface View {
void render(HttpServletRequest request, HttpServletResponse response, String path);
}

6
blog/dispatcher-servlet/src/main/java/com/example/dispatcherservlet/springmvc/ViewResolver.java Normal file
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package com.example.dispatcherservlet.springmvc;
public interface ViewResolver {
View resolveViewName(String viewName) throws Exception;
}

110
blog/dispatcher-servlet/src/main/java/com/example/dispatcherservlet/springmvc/WebApplicationContext.java Normal file
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package com.example.dispatcherservlet.springmvc;
import com.example.dispatcherservlet.annotation.Controller;
import com.example.dispatcherservlet.annotation.RequestMapping;
import java.io.File;
import java.lang.reflect.Method;
import java.net.URL;
import java.util.*;
public class WebApplicationContext {
public static WebApplicationContext instance;
private final Map<String, MappingRegistry> handlerMapping = new HashMap<>();
private final List<HandlerAdapter> handlerAdapters = new ArrayList<>();
private final List<ViewResolver> viewResolvers = new ArrayList<>();
public static WebApplicationContext getInstance() {
if (instance == null) {
instance = new WebApplicationContext();
}
return instance;
}
private WebApplicationContext() {
initResources();
}
public Map<String, MappingRegistry> getHandlerMapping() {
return handlerMapping;
}
public List<HandlerAdapter> getHandlerAdapters() {
return handlerAdapters;
}
public List<ViewResolver> getViewResolvers() {
return viewResolvers;
}
private void initResources() {
String packageName = "com.example.dispatcherservlet";
Set<Class<?>> classes = new HashSet<>();
setClasses(classes, packageName);
for (Class<?> aClass : classes) {
try {
Object instance = aClass.getConstructor().newInstance();
if (instance instanceof HandlerAdapter) {
handlerAdapters.add((HandlerAdapter) instance);
}
if (instance instanceof ViewResolver) {
viewResolvers.add((ViewResolver) instance);
}
if (aClass.isAnnotationPresent(Controller.class)) {
Method[] declaredMethods = aClass.getDeclaredMethods();
for (Method declaredMethod : declaredMethods) {
if (declaredMethod.isAnnotationPresent(RequestMapping.class)) {
RequestMapping annotation = declaredMethod.getAnnotation(RequestMapping.class);
handlerMapping.put(annotation.value(), new MappingRegistry(instance, declaredMethod));
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
private void setClasses(Set<Class<?>> classes, String packageName) {
String directoryString = getDirectoryString(packageName);
File directory = new File(directoryString);
if(directory.exists()){
String[] files = directory.list();
for(String fileName : files){
if (isExcluded(fileName)) continue;
if (fileName.endsWith(".class")) {
fileName = fileName.substring(0, fileName.length() - 6);
try{
Class<?> c = Class.forName(packageName + "." + fileName);
if (!c.isInterface()) {
classes.add(c);
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
} else {
setClasses(classes, packageName + "." + fileName);
}
}
}
}
private boolean isExcluded(String fileName) {
String[] exclude = {"WebApplicationContext", "MyDispatcherServlet"};
for (String s : exclude) {
if (fileName.contains(s)) return true;
}
return false;
}
private String getDirectoryString(String packageName) {
String packageNameSlashed =
"./" + packageName.replace(".", "/");
URL packageDirURL =
Thread.currentThread().getContextClassLoader().getResource(packageNameSlashed);
return packageDirURL.getFile();
}
}

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blog/dispatcher-servlet/src/main/webapp/404.jsp Normal file
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<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h1>404 Page</h1>
</body>
</html>

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blog/dispatcher-servlet/src/main/webapp/WEB-INF/web.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
</web-app>

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blog/dispatcher-servlet/src/main/webapp/index.jsp Normal file
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<%@ page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<!DOCTYPE html>
<html>
<head>
<title>JSP - Hello World</title>
</head>
<body>
<h1><%= "Hello World!" %>
</h1>
<br/>
<a href="hello-servlet">Hello Servlet</a>
</body>
</html>

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blog/dispatcher-servlet/src/main/webapp/main.jsp Normal file
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<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h1>Main!!</h1>
</body>
</html>