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‎.gitignore

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target
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tomcat.*
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nb-configuration.xml

‎pom.xml

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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.vison.webmvc</groupId>
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<artifactId>web-mvc</artifactId>
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<packaging>war</packaging>
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<version>1.0-SNAPSHOT</version>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
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<maven.compiler.source>11</maven.compiler.source>
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<maven.compiler.target>11</maven.compiler.target>
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<java.version>11</java.version>
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<tomcat.version>9.0.26</tomcat.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>javax.websocket</groupId>
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<artifactId>javax.websocket-api</artifactId>
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<version>1.1</version>
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<scope>provided</scope>
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</dependency>
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<dependency>
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<groupId>org.apache.tomcat.embed</groupId>
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<artifactId>tomcat-embed-core</artifactId>
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<version>${tomcat.version}</version>
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<scope>compile</scope>
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</dependency>
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<dependency>
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<groupId>org.apache.tomcat.embed</groupId>
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<artifactId>tomcat-embed-jasper</artifactId>
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<version>${tomcat.version}</version>
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<scope>compile</scope>
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</dependency>
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<dependency>
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<groupId>org.apache.logging.log4j</groupId>
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<artifactId>log4j-core</artifactId>
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<version>2.12.0</version>
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</dependency>
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<dependency>
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<groupId>org.apache.logging.log4j</groupId>
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<artifactId>log4j-api</artifactId>
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<version>2.12.0</version>
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</dependency>
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<dependency>
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<groupId>org.apache.tomcat</groupId>
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<artifactId>tomcat-websocket</artifactId>
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<version>${tomcat.version}</version>
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</dependency>
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</dependencies>
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<build>
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<finalName>webmvc</finalName>
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</build>
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</project>

‎src/main/java/com/vison/webmvc/Application.java

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package com.vison.webmvc;
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import java.io.File;
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import org.apache.catalina.Context;
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import org.apache.catalina.WebResourceRoot;
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import org.apache.catalina.startup.Tomcat;
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import org.apache.catalina.webresources.DirResourceSet;
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import org.apache.catalina.webresources.StandardRoot;
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import org.apache.logging.log4j.LogManager;
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import org.apache.logging.log4j.Logger;
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/**
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*
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* @author vison.cao <visonforcoding@gmail.com>
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*/
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public class Application {
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private static final Logger log = LogManager.getLogger(Application.class);
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/**
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* @param args the command line arguments
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*/
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public static void main(String[] args) throws Exception {
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// 启动Tomcat:
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Tomcat tomcat = new Tomcat();
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tomcat.setPort(Integer.getInteger("port", 8081));
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log.info("hello");
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log.info("server run in http://localhost:8081");
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tomcat.getConnector();
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// 创建webapp:
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Context ctx = tomcat.addWebapp("", new File("src/main/webapp").getAbsolutePath());
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WebResourceRoot resources = new StandardRoot(ctx);
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resources.addPreResources(
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new DirResourceSet(resources, "/WEB-INF/classes", new File("target/classes").getAbsolutePath(), "/"));
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ctx.setResources(resources);
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tomcat.start();
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tomcat.getServer().await();
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}
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}

‎src/main/java/com/vison/webmvc/framework/DispatchServlet.java

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package com.vison.webmvc.framework;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.util.HashMap;
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import java.util.Map;
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import javax.servlet.ServletException;
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import javax.servlet.annotation.WebServlet;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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/**
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*
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* @author vison.cao <visonforcoding@gmail.com>
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*/
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@WebServlet(name = "DispatchServlet", urlPatterns = {"/"})
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public class DispatchServlet extends HttpServlet {
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private Map<String, GetDispatcher> getMappings = new HashMap<>();
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private Map<String, PostDispatcher> postMappings = new HashMap<>();
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private ViewEngine viewEngine;
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@Override
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public void init() throws ServletException {
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}
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@Override
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protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
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resp.setContentType("text/html");
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resp.setCharacterEncoding("UTF-8");
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String path = req.getRequestURI().substring(req.getContextPath().length());
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log(path);
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resp.getWriter().write(path);
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resp.getWriter().flush();
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// 根据路径查找GetDispatcher:
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// 调用Controller方法获得返回值:
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}
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}

‎src/main/java/com/vison/webmvc/framework/GetDispatcher.java

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package com.vison.webmvc.framework;
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import java.lang.reflect.Method;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import javax.servlet.http.HttpSession;
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/**
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*
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* @author vison.cao <visonforcoding@gmail.com>
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*/
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class GetDispatcher {
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Object instance; // Controller实例
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Method method; // Controller方法
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String[] parameterNames; // 方法参数名称
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Class<?>[] parameterClasses; // 方法参数类型
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}

‎src/main/java/com/vison/webmvc/framework/ModelAndView.java

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/*
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* To change this license header, choose License Headers in Project Properties.
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* To change this template file, choose Tools | Templates
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* and open the template in the editor.
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*/
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package com.vison.webmvc.framework;
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/**
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*
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* @author vison.cao <visonforcoding@gmail.com>
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*/
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public class ModelAndView {
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}

‎src/main/java/com/vison/webmvc/framework/PostDispatcher.java

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package com.vison.webmvc.framework;
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/**
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*
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* @author vison.cao <visonforcoding@gmail.com>
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*/
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class PostDispatcher {
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}

‎src/main/java/com/vison/webmvc/framework/ViewEngine.java

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package com.vison.webmvc.framework;
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import java.io.IOException;
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import java.io.Writer;
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/**
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*
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* @author vison.cao <visonforcoding@gmail.com>
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*/
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class ViewEngine {
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public void render(ModelAndView mv, Writer writer) throws IOException {
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}
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}

‎src/main/webapp/META-INF/context.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<Context path="/webmvc"/>

‎src/main/webapp/index.html

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<!DOCTYPE html>
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<html>
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<head>
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<title>Start Page</title>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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</head>
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<body>
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<h1>Hello World!</h1>
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</body>
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</html>

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