javamvc实现登录验证注册验证的小程序

package com.zgf.web.servlet; import java.io.IOException; import java.io.PrintWriter; import java.lang.reflect.InvocationTargetException; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.beanutils.BeanUtils; import org.apache.commons.beanutils.ConvertUtils; import org.apache.commons.beanutils.Converter; import com.zgf.domian.User; import com.zgf.domian.userForm; import com.zgf.service.UserService; import com.zgf.service.impl.UserServiceImpl; public class RegisterServlet extends HttpServlet { public static String duplication=""; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); response.setContentType("text/html;charset=utf-8"); PrintWriter out = response.getWriter(); //先判断用户名是否已经存在 User user=new User(); user.setUsername(request.getParameter("username")); UserService service=new UserServiceImpl(); //也不要了 User u=service.duplicate(user); System.out.println(u+"哈哈哈"); //证明为静态了duplication if(u!=null) { System.out.println(22); duplication="用户名重复！"; } System.out.println(duplication+11); //截止 userForm form=new userForm(); try { BeanUtils.populate(form, request.getParameterMap()); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (InvocationTargetException e) { e.printStackTrace(); } //如果没有错误信息，check返回为empty，empty为假，非假即为真 if(!form.check()){ duplication=""; System.out.println(duplication+22); request.setAttribute("info", form); request.getRequestDispatcher("/register.jsp").forward(request, response); return; } // User user=new User(); //把表单提交过来的字符串类型的日期转换为date类型，然后再注入到user try { ConvertUtils.register(new Converter(){ Date date=null; @Override public Object convert(Class type, Object value) { if(value instanceof String){ String ss=(String)value; SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd"); try { date=sdf.parse(ss); } catch (ParseException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return date; } },Date.class); BeanUtils.populate(user, request.getParameterMap()); } catch (IllegalAccessException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (InvocationTargetException e) { // TODO Auto-generated catch block e.printStackTrace(); } // UserService service=new UserServiceImpl(); service.register(user); out.print("注册成功，2秒后返回"); response.setHeader("refresh", "2;url="+request.getContextPath()+"/index.jsp"); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request,response); response.setContentType("text/html;charset=utf-8"); PrintWriter out = response.getWriter(); } }