自制MVC框架：IAIMVC
MVC框架已经使用的非常广泛了，现在我也自制一个MVC框架来加深我对MVC框架的理解。
首先MVC共分三个内容，M(Model) V(View) C(Controller)。
M:主要就是一些Action，用来处理业务内容和数据库的操作。
V:视图，用于向用户显示内容。
C:所有的请求由这里来管理，进行分配。分发业务请求。
1.在web.xml文件中加入一个servlet，去拦截所有的满足条件请求，这些请求由控制键(C)来进行分发管理。
<servlet><description>DispatchServlet</description><display-name>DispatchServlet</display-name><servlet-name>DispatchServlet</servlet-name><servlet-class>com.iaiai.mvc.controller.DispatchServlet</servlet-class><init-param><description>Configuration File</description><param-name>configFile</param-name><param-value>WEB-INF/mvc-config.xml</param-value></init-param></servlet><servlet-mapping><servlet-name>DispatchServlet</servlet-name><url-pattern>*.do</url-pattern></servlet-mapping>
package com.iaiai.mvc.controller;import java.io.IOException;import java.lang.reflect.Method;import java.util.Map;import javax.servlet.ServletConfig;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.iaiai.mvc.action.ActionPackager;import com.iaiai.mvc.config.ConfigHelper;import com.iaiai.mvc.util.RexUtil;/** * * <p> * Title: DispatchServlet.java * </p> * <p> * E-Mail: 176291935@qq.com * </p> * <p> * QQ: 176291935 * </p> * <p> * Http: iaiai.iteye.com * </p> * <p> * Create time: 2011-10-14 * </p> * * @author 丸子 * @version 0.0.1 */public class DispatchServlet extends HttpServlet {private static final long serialVersionUID = 1131523345611250389L;private static final String CONTENT_TYPE = "text/html;charset=UTF-8";private Map<String, ActionPackager> actionsMap;/* * public static String DataURL=null; public static String MarkURL=null; * public static String PastePicsURL=null; *//** * Constructor of the object. */public DispatchServlet() {super();}/** * Initialization of the servlet. <br> * * @throws ServletException * if an error occurs */public void init() throws ServletException {// read config values from the web.xml// 通过ServletContext取得工程的绝对物理路径ServletContext sct = getServletContext();String realPath = sct.getRealPath("/");// 通过ServletConfig实例取得初始化参数configFileServletConfig config = this.getServletConfig();String CfgFile = config.getInitParameter("configFile");// 组合配置文件全物理路径CfgFile = realPath + CfgFile;// 创建ConfigHelper对象，初始化actionsMapConfigHelper configHelper = new ConfigHelper(CfgFile, config);actionsMap = configHelper.getActionsMap();}/** * Destruction of the servlet. <br> */public void destroy() {super.destroy(); // Just puts "destroy" string in logactionsMap = null;}/** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. * * @param request * the request send by the client to the server * @param response * the response send by the server to the client * @throws ServletException * if an error occurred * @throws IOException * if an error occurred */public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doPost(request, response);}/** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to * post. * * @param request * the request send by the client to the server * @param response * the response send by the server to the client * @throws ServletException * if an error occurred * @throws IOException * if an error occurred */public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setContentType(CONTENT_TYPE);// 取得请求的URLString reqURL = request.getServletPath();// 取得模式匹配字符串，取得请求后缀String patternStr;if (reqURL.contains("?")) {patternStr = RexUtil.getMatchedString("([.])(.*)?", reqURL);} else {patternStr = RexUtil.getMatchedString("([.])(.*)$", reqURL);}// 取得请求的Action名称String actionName = RexUtil.getMatchedString("/(.*)[.]" + patternStr,reqURL);ActionPackager actionPackager = actionsMap.get(actionName);// 如果请求的Action为空，则返回404错误if (actionPackager == null)response.sendError(HttpServletResponse.SC_NOT_FOUND);else {String methodName = request.getParameter(actionPackager.getMethodName());// 执行Action中的方法Class<?> actionClass = actionPackager.getActionClass();Object actionObj = actionPackager.getActionObj();try {Method method = actionClass.getMethod(methodName,HttpServletRequest.class, HttpServletResponse.class);method.invoke(actionObj, request, response);} catch (NoSuchMethodException e) {// 如果请求方法不存在，抛出404错误response.sendError(HttpServletResponse.SC_NOT_FOUND);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}package com.iaiai.mvc.config;import java.io.File;import java.util.HashMap;import java.util.List;import java.util.Map;import javax.servlet.ServletConfig;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.dom4j.Document;import org.dom4j.DocumentException;import org.dom4j.Element;import org.dom4j.io.SAXReader;import com.iaiai.mvc.action.Controller;import com.iaiai.mvc.action.ActionFactory;import com.iaiai.mvc.action.ActionPackager;/** * * <p> * Title: ConfigHelper.java * </p> * <p> * E-Mail: 176291935@qq.com * </p> * <p> * QQ: 176291935 * </p> * <p> * Http: iaiai.iteye.com * </p> * <p> * Create time: 2011-10-14 * </p> * * @author 丸子 * @version 0.0.1 */public class ConfigHelper {public static Log log = LogFactory.getLog(ConfigHelper.class);private ActionFactory actionFactory;private Document document;/** * 构造函数,加载配置文件,初始化document * * @param configFile */public ConfigHelper(String configFile, ServletConfig servletConfig) {log.info("加载mvc配置文件...");try {File file = new File(configFile);SAXReader reader = new SAXReader();document = reader.read(file);} catch (DocumentException e) {log.error("配置文件不存在或格式不正确");e.printStackTrace();}log.info("初始化ActionFactory...");if (servletConfig == null) {try {throw new Exception();} catch (Exception e) {log.error("ServletConfig参数为Null，ActionFactory初始化失败");e.printStackTrace();}} else {actionFactory = new ActionFactory(servletConfig);}}public Map<String, ActionPackager> getActionsMap() {log.info("读取mvc配置文件,装载至缓存中...");Map<String, ActionPackager> actionsMap = new HashMap<String, ActionPackager>();Element root = document.getRootElement();List<?> actionElms = root.elements("action");// 遍历所有action元素for (int i = 0; i < actionElms.size(); i++) {Element actionElm = (Element) actionElms.get(i);ActionPackager action = new ActionPackager();String actionClassPath = actionElm.attributeValue("class");Controller actionObj = actionFactory.getActionInstance(actionClassPath);action.setName(actionElm.attributeValue("name"));action.setClasspath(actionClassPath);action.setMethodName(actionElm.attributeValue("method"));action.setActionClass(actionObj.getClass());action.setActionObj(actionObj);actionsMap.put(action.getName(), action);}log.info("装载完成");return actionsMap;}}package com.iaiai.mvc.action;import javax.servlet.ServletConfig;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;/** * * <p> * Title: ActionFactory.java * </p> * <p> * E-Mail: 176291935@qq.com * </p> * <p> * QQ: 176291935 * </p> * <p> * Http: iaiai.iteye.com * </p> * <p> * Create time: 2011-10-14 * </p> * * @author 丸子 * @version 0.0.1 */public class ActionFactory {public static Log log = LogFactory.getLog(ActionFactory.class);private ServletConfig servletConfig;public ActionFactory(ServletConfig servletConfig) {this.servletConfig = servletConfig;}/** * 得到Action实例 * * @return */public Controller getActionInstance(String actionClassPath) {Class<?> actionClass = null;Controller actionObj = null;try {// 向Action中注入servletConfigController.setServletConfig(servletConfig);// 实例化Action子类actionClass = Class.forName(actionClassPath);actionObj = (Controller) actionClass.newInstance();log.debug("创建" + actionClassPath + "实例");} catch (ClassNotFoundException e) {log.error("Action相关类没有找到");e.printStackTrace();} catch (Exception e) {e.printStackTrace();}return actionObj;}}package com.iaiai.mvc.action;import javax.servlet.ServletConfig;/** * * <p> * Title: Controller.java * </p> * <p> * E-Mail: 176291935@qq.com * </p> * <p> * QQ: 176291935 * </p> * <p> * Http: iaiai.iteye.com * </p> * <p> * Create time: 2011-10-14 * </p> * * @author 丸子 * @version 0.0.1 */public abstract class Controller {private static ServletConfig config;/** * 注入servletConfig * * @param servletConfig */public static void setServletConfig(ServletConfig servletConfig) {config = servletConfig;}/** * 得到ServletConfig * * @return */protected ServletConfig getServletConfig() {return config;}}package com.iaiai.mvc.action;/** * * <p> * Title: ActionPackager.java * </p> * <p> * E-Mail: 176291935@qq.com * </p> * <p> * QQ: 176291935 * </p> * <p> * Http: iaiai.iteye.com * </p> * <p> * Create time: 2011-10-14 * </p> * * @author 丸子 * @version 0.0.1 */public class ActionPackager {private String name; // action名称private String classpath; // action的完整路径private String methodName;private Class<?> actionClass;private Controller actionObj;public String getName() {return name;}public void setName(String name) {this.name = name;}public String getClasspath() {return classpath;}public void setClasspath(String classpath) {this.classpath = classpath;}public String getMethodName() {return methodName;}public void setMethodName(String methodName) {this.methodName = methodName;}public Class<?> getActionClass() {return actionClass;}public void setActionClass(Class<?> actionClass) {this.actionClass = actionClass;}public Controller getActionObj() {return actionObj;}public void setActionObj(Controller actionObj) {this.actionObj = actionObj;}}