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下面这个是我loginServlet代码 各位帮帮忙

package cn.servlet;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.RequestDispatcher;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

import cn.biz.UserBiz;

import cn.entity.User;

public class LoginServlet extends HttpServlet {

/**

* Destruction of the servlet.

*/

public void destroy() {

super.destroy(); // Just puts "destroy" string in log

// Put your code here

}

/**

* The doGet method of the servlet.

*

* 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 {

response.setContentType("text/html");

PrintWriter out = response.getWriter();

out

.println(""-//W3C//DTD HTML 4.01 Transitional//EN\">");

out.println("");

out.println("

A Servlet");

out.println("

");

out.print(" This is ");

out.print(this.getClass());

out.println(", using the GET method");

out.println(" ");

out.println("");

out.flush();

out.close();

doPost(request,response);

}

/**

* The doPost method of the servlet.

*

* 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("text/html;charset=utf-8");

PrintWriter out = response.getWriter();

request.setCharacterEncoding("UTF-8");

String name=request.getParameter("userName");

String passWord=request.getParameter("passWord");

User user=new User();

user.setUserName(name);

user.setPassWord(passWord);

UserBiz userBiz=new UserBiz();

boolean result=userBiz.login(user);

HttpSession session=request.getSession();

if(result){

session.setAttribute("username",name);

response.sendRedirect("index.jsp");

}else{

request.setAttribute("message","用户名密码错误！");

request.getRequestDispatcher("login.jsp").forward(request,response);

}

}

/**

* Initialization of the servlet.

*

* @throws ServletException if an error occurs

*/

public void init() throws ServletException {

// Put your code here

}

}