这是我自己开发的一个MVC框架

				package dark.web.frame.form;
				
				import java.io.IOException;
				
				import javax.servlet.RequestDispatcher;
				import javax.servlet.ServletContext;
				import javax.servlet.ServletException;
				import javax.servlet.http.HttpServletRequest;
				import javax.servlet.http.HttpServletResponse;
				import javax.servlet.http.HttpSession;
				
				import dark.web.frame.Form;
				import dark.web.frame.Helper;
				import dark.web.frame.Message;
				import dark.web.frame.Value;
				
				import org.apache.log4j.Logger;
				
				/**
				 * Title:            表单验证抽象类
				 * Description:      定义表单验证程序所必需的接口方法和公用方法
				 * Copyright:        Copyright (c) 2004
				 * Company:          DIS
				 * Create Time:      2004-12-6 0:17:20
				 * @author             darkhe
				 * @version            1.0
				 */
				public abstract class AbstractForm implements Form
				{
					protected static Logger log = Logger.getLogger("DWF");	
					
					private ServletContext servletContext;
					private HttpServletRequest request;
					private HttpServletResponse response;
					private Message message;
				
					private String input;
				
					/**
					 * 设置初始化参数，用于获取servlet上下文、请求和反馈
					 * @param context
					 * @param request
					 * @param response
					 */
					public void init(
						ServletContext servletContext,
						HttpServletRequest request,
						HttpServletResponse response,
						Message message)
					{
						this.servletContext = servletContext;
						this.request = request;
						this.response = response;
						this.message = message;
					}
				
					/**
					 * @throws ServletException
					 * @throws IOException
					 */
					public void forward() throws ServletException, IOException
					{
						RequestDispatcher dispathcer =
							servletContext.getRequestDispatcher(input);
						dispathcer.forward(request, response);
					}
				
					/**
					 * 命令类的检证方法，default返回true，开发人员可根据具
					 * 体商来逻辑来重置当前方法的行为。只要当前返回true的情
					 * 况下，validate方法才被执行
					 * @return 
					 * @throws ServletException
					 * @throws IOException
					 */
					public boolean isAuthentic() throws ServletException, IOException
					{
						return true;
					}
				
					/**
					 * 表单验证方法，子类必须实现当前方法已实现子类已经的具体的验证逻辑
					 * 开发人员应当将提示消息放入Message类。validate()方法返回的Message
					 * 对象的消息不为空则表明表单没有通过，此时控制器将会将请求转发到input
					 * 参数所指定的页面
					 * @throws ServletException
					 * @throws IOException
					 */
					public abstract Message validate() throws ServletException, IOException;
				
					/**
					 * @return
					 */
					public HttpServletRequest getRequest()
					
					{
						return request;
					}
				
					/**
					 * @return
					 */
					public HttpServletResponse getResponse()
					{
						return response;
					}
				
					/**
					 * @return
					 */
					public ServletContext getServletContext()
					{
						return servletContext;
					}
				
					/**
					 * 返回请求转发路径
					 * @return 
					 */
					public String getInput()
					{
						return input;
					}
				
					/**
					 * 设定请求转发路径
					 * @param string
					 */
					public void setInput(String string)
					{
						input = string;
					}
				
					/**
					 * @return
					 */
					public Message getMessage()
					{
						return message;
					}
				
					/**
					 * @param request
					 * @return
					 */
					public static Message loadMessage(HttpServletRequest request)
					{
						return Helper.loadMessage(request);
					}
				
					/**
					 * @param session
					 * @return
					 */
					public static Message loadMessage(HttpSession session)
					{
						return Helper.loadMessage(session);
					}
				
					/**
					 * @param request
					 * @return
					 */
					public static Value loadValue(HttpServletRequest request)
					{
						return Helper.loadValue(request);
					}
				
					/**
					 * @param session
					 * @return
					 */
					public static Value loadValue(HttpSession session)
					{
						return Helper.loadValue(session);
					}
				
					/**
					 * @param m
					 * @param request
					 */
					public static void saveMessage(Message m, HttpServletRequest request)
					{
						Helper.saveMessage(m, request);
					}
				
					/**
					 * @param m
					 * @param session
					 */
					public static void saveMessage(Message m, HttpSession session)
					{
						Helper.saveMessage(m, session);
					}
				
					/**
					 * @param v
					 * @param request
					 */
					public static void saveValue(Value v, HttpServletRequest request)
					{
						Helper.saveValue(v, request);
					}
				
					/**
					 * @param v
					 * @param session
					 */
					public static void saveValue(Value v, HttpSession session)
					{
						Helper.saveValue(v, session);
					}
				
				}