自定义MVC实现登录案例

 1 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 2 ?????????xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> 3 ????<parent> 4 ????????<artifactId>01MyBatis</artifactId> 5 ????????<groupId>cn.happy</groupId> 6 ????????<version>1.0-SNAPSHOT</version> 7 ????</parent> 8 ????<modelVersion>4.0.0</modelVersion> 9 ????<artifactId>12CustomMVC</artifactId>10 ????<packaging>war</packaging>11 ????<name>12CustomMVC Maven Webapp</name>12 ????<url>http://maven.apache.org</url>13 ????<dependencies>14 ????????<dependency>15 ????????????<groupId>junit</groupId>16 ????????????<artifactId>junit</artifactId>17 ????????????<version>4.3</version>18 ????????????<scope>test</scope>19 ????????</dependency>20 21 ????????<!-- https://mvnrepository.com/artifact/dom4j/dom4j -->22 ????????<dependency>23 ????????????<groupId>dom4j</groupId>24 ????????????<artifactId>dom4j</artifactId>25 ????????????<version>1.6.1</version>26 ????????</dependency>27 28 ????????<!--ServletAPI-->29 ????????<dependency>30 ????????????<groupId>javaee</groupId>31 ????????????<artifactId>javaee-api</artifactId>32 ????????????<version>5</version>33 ????????</dependency>34 ????</dependencies>35 ????<build>36 ????????<resources>37 ????????????<resource>38 ????????????????<directory>src/main/java</directory>39 ????????????????<includes>40 ????????????????????<include>**/*.*</include>41 ????????????????</includes>42 ????????????</resource>43 ????????</resources>44 ????</build>45 </project>

 1 <?xml version=‘1.0‘ encoding=‘UTF-8‘?> 2 <!DOCTYPE myframe[ 3 ????????<!ELEMENT myframe (actions)> 4 ????????<!ELEMENT actions (action*)> 5 ????????<!ELEMENT action (result*)> 6 ????????<!ATTLIST action 7 ????????????????name CDATA #REQUIRED 8 ????????????????class CDATA #REQUIRED> 9 ????????<!ELEMENT result (#PCDATA)>10 ????????<!ATTLIST result11 ????????????????name CDATA #IMPLIED12 ????????????????redirect (true|false) "false">13 ????????]>14 <myframe>15 ????<actions>16 ????????<action name="login" class="cn.curry.action.LoginAction">17 ????????????<result name="success">/success.jsp</result>18 ????????????<result name="login">login.jsp</result>19 ????????</action>20 ????</actions>21 </myframe>

 1 package cn.curry.action; 2 ?3 import javax.servlet.http.HttpServletRequest; 4 import javax.servlet.http.HttpServletResponse; 5 ?6 /** 7 ?* Created by Administrator on 2018/3/4. 8 ?*/ 9 public interface Action {10 ????//定义字符串常量11 ????public static final String SUCCESS="success";12 ????public static final String NONE="none";13 ????public static final String ERROR="error";14 ????public static final String INPUT="input";15 ????public static final String LOGIN="login";16 ????//准备一个方法，用于获取数据17 ????public String execute(HttpServletRequest request, HttpServletResponse response)throws Exception;18 }

 1 package cn.curry.action; 2 ?3 import java.util.HashMap; 4 import java.util.Map; 5 ?6 /** 7 ?* Created by Administrator on 2018/3/4. 8 ?*/ 9 public class ActionMapping {10 ????private String name;11 ????private String className;12 ????private Map<String,String> map=new HashMap<String, String>();13 14 ????public String getName() {15 ????????return name;16 ????}17 18 ????public void setName(String name) {19 ????????this.name = name;20 ????}21 22 ????public String getClassName() {23 ????????return className;24 ????}25 26 ????public void setClassName(String className) {27 ????????this.className = className;28 ????}29 30 ????public String getValue(String key) {31 ????????return map.get(key);32 ????}33 34 ????public void addToMap(String key,String value) {35 ????????map.put(key,value);36 ????}37 }

 1 package cn.curry.action; 2 ?3 /** 4 ?* Created by Administrator on 2018/3/4. 5 ?*/ 6 public class ActionManager { 7 ????public static Action getActionClass(String className) throws Exception{ 8 ????????Class clazz=null; 9 ????????Action action=null;10 ????????clazz=Thread.currentThread().getContextClassLoader().loadClass(className);11 ????????if (clazz==null){12 ????????????clazz=Class.forName(className);13 ????????}14 ????????if (action==null){15 ????????????action=(Action) clazz.newInstance();16 ????????}17 ????????return action;18 ????}19 }

 1 package cn.curry.action; 2 ?3 import org.dom4j.Document; 4 import org.dom4j.Element; 5 import org.dom4j.io.SAXReader; 6 ?7 import java.io.InputStream; 8 import java.util.HashMap; 9 import java.util.Iterator;10 import java.util.Map;11 12 /**13 ?* Created by Administrator on 2018/3/4.14 ?*/15 public class ActionMappingManager {16 ????private Map<String,ActionMapping> map=new HashMap<String, ActionMapping>();17 18 ????public ?ActionMapping getValue(String key) {19 ????????return map.get(key);20 ????}21 22 ????public void addToMaps(String key,ActionMapping value) {23 ????????map.put(key,value);24 ????}25 26 ????public ActionMappingManager(String [] files)throws Exception{27 ????????for (String item:files){28 ????????????init(item);29 ????????}30 ????}31 ????public void init(String path)throws Exception{32 ????????InputStream is=this.getClass().getResourceAsStream("/"+path);33 ????????Document doc=new SAXReader().read(is);34 ????????Element root=doc.getRootElement();35 ????????Element actions=(Element)root.elements("actions").iterator().next();36 ????????for (Iterator<Element> action = actions.elementIterator("action"); action.hasNext();){37 ????????????Element actionnext=action.next();38 ????????????ActionMapping am=new ActionMapping();39 ????????????am.setName(actionnext.attributeValue("name"));40 ????????????am.setClassName(actionnext.attributeValue("class"));41 ????????????for (Iterator<Element> result=actionnext.elementIterator("result");result.hasNext();){42 ????????????????Element resultnext=result.next();43 ????????????????String name=resultnext.attributeValue("name");44 ????????????????String value=resultnext.getText();45 ????????????????if (name==null||"".equals(name)){46 ????????????????????name="success";47 ????????????????}48 ????????????????am.addToMap(name,value);49 ????????????}50 ????????????map.put(am.getName(),am);51 ????????}52 ????}53 }

 1 package cn.curry.servlet; 2 ?3 import cn.curry.action.Action; 4 import cn.curry.action.ActionManager; 5 import cn.curry.action.ActionMapping; 6 import cn.curry.action.ActionMappingManager; 7 ?8 import javax.servlet.ServletConfig; 9 import javax.servlet.ServletException;10 import javax.servlet.http.HttpServlet;11 import javax.servlet.http.HttpServletRequest;12 import javax.servlet.http.HttpServletResponse;13 import java.io.IOException;14 15 /**16 ?* Created by Administrator on 2018/3/4.17 ?*/18 public class LoginServlet extends HttpServlet {19 ????private ActionMappingManager manager=null;20 ????private String getClassName(HttpServletRequest request){21 ????????String uri=request.getRequestURI();22 ????????System.out.println(uri+" ???????uri");23 ????????String context=request.getContextPath();24 ????????System.out.println(context+" ????????????context");25 ????????String result=uri.substring(context.length());26 ????????System.out.println(result+" ?????????????result");27 ????????return result.substring(1,result.lastIndexOf("."));28 ????}29 30 31 ????protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {32 ????????String key=getClassName(request);33 ????????System.out.println(key+" ??????????key");34 ????????try {35 ????????????ActionMapping actionMapping=manager.getValue(key);36 ????????????System.out.println(actionMapping.getClassName()+" ???????????classname");37 ????????????Action action= ActionManager.getActionClass(actionMapping.getClassName());38 ????????????String result=action.execute(request,response);39 ????????????System.out.println(result+" ??????????????????result");40 ????????????String path=actionMapping.getValue(result);41 ????????????System.out.println(path+" ???????????????path");42 ????????????request.getRequestDispatcher(path).forward(request,response);43 ????????} catch (Exception e) {44 ????????????e.printStackTrace();45 ????????}46 ????}47 48 ????protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {49 ????????doPost(request,response);50 ????}51 52 ????public void init(ServletConfig config) throws ServletException {53 ????????String fileName=config.getInitParameter("config");54 ????????String file[]=null;55 ????????if(fileName==null){56 ????????????file=new String[]{"Framework.xml"};57 ????????}else {58 ????????????fileName.split(",");59 ????????}60 ????????try {61 ????????????manager=new ActionMappingManager(file);62 ????????} catch (Exception e) {63 ????????????e.printStackTrace();64 ????????}65 ????}66 }

 1 <!DOCTYPE web-app PUBLIC 2 ?"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" 3 ?"http://java.sun.com/dtd/web-app_2_3.dtd" > 4 ?5 <web-app> 6 ??<display-name>Archetype Created Web Application</display-name> 7 ????<servlet> 8 ????????<servlet-name>LoginServlet</servlet-name> 9 ????????<servlet-class>cn.curry.servlet.LoginServlet</servlet-class>10 ????</servlet>11 ????<servlet-mapping>12 ????????<servlet-name>LoginServlet</servlet-name>13 ????????<url-pattern>*.action</url-pattern>14 ????</servlet-mapping>15 </web-app>

 1 <%@ page contentType="text/html;charset=UTF-8" language="java" %> 2 <html> 3 <head> 4 ????<title>登录</title> 5 </head> 6 <body> 7 <form action="login.action" method="post"> 8 ????用户名：<input name="name"><br> 9 ????密码：<input name="pwd"/><br/>10 ????<input type="submit" value="登陆"/>11 </form>12 </body>13 </html>

<%-- ?Created by IntelliJ IDEA. ?User: Administrator ?Date: 2018/3/4 ?Time: 19:43 ?To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head> ???<title>登录</title></head><body><h1>success！！！</h1></body></html>