初學sevlet+jsp登錄

package com.liluan.severlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.PageContext;

import com.liluan.model.User;

public class LoginServler extends HttpServlet {

 public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
  String uname =request.getParameter("uname").trim();
  String pwd =request.getParameter("pwd").trim();
  if("daidai".trim().equals(uname)&&"510".trim().equals(pwd))
  { //登陸成功
   User user=new User(uname,pwd);
   request.getSession().setAttribute("user",user);
   
   //轉發重定向
   request.getRequestDispatcher("login_ok.jsp").forward(request, response);
   
   return;
  }else
  {//登錄失敗
   request.setAttribute("loginError", "錯誤");
   request.getRequestDispatcher("login.jsp").forward(request, response);
   return; 
  }
  
 }

}