cookie记住密码

login.java：：

package com.hsst.util;
import java.sql.*;
public class Login {

 /**
  * @param args
  */
 private Connection conn=null;
 private PreparedStatement ps=null;
 private ResultSet rs=null;
 private boolean flag=false;
 private SqlConn db=null;
 
 public Login(){
//  db=new SqlConn();
//  conn=db.getconn();
 }
 //关闭方法
 public void finalize(){
  db.closemethod();
 }
 //验证用户名密码是否存在
 public boolean checkNamePwd(String name,String pwd){
  
   if(name.equals("admin")&pwd.equals("admin")){
    flag=true;
   }
       
  
  return flag;
 }
 
 public static void main(String[] args) {
  //new Login().checkNamePwd("admin", "admin");
 }

}
＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝

LoginServlet.java:

package com.hsst.servlet;

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

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class LoginServlet extends HttpServlet {

 /**
  * Constructor of the object.
  */
 public LoginServlet() {
  super();
 }

 /**
  * Destruction of the servlet. <br>
  */
 public void destroy() {
  super.destroy(); // Just puts "destroy" string in log
  // Put your code here
 }

 /**
  * 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 {

  response.setContentType("text/html");
  PrintWriter out = response.getWriter();
  
 }

 /**
  * 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("text/html");
  PrintWriter out = response.getWriter();
  String uname=request.getParameter("userno");
  String pwd=request.getParameter("password");
  String locals=request.getParameter("locals");
  HttpSession session=request.getSession(true);
  boolean flag=new com.hsst.util.Login().checkNamePwd(uname, pwd);
  if(flag){
   //设置cookie
   if(request.getParameter("send")!=null && locals!=null)
   {
     Cookie cookie=new Cookie(uname, pwd);
     cookie.setPath("/");
     cookie.setMaxAge(365*24*60*60); 
     response.addCookie(cookie); 
     response.sendRedirect(request.getContextPath()+"/ok.jsp");
   }
   //删除cookie
   else if(request.getCookies()!=null){
    System.out.println(request.getCookies());
    Cookie deletecookie=new Cookie(uname, null);
    deletecookie.setPath("/");
    deletecookie.setMaxAge(0); 
    response.addCookie(deletecookie); 
    response.sendRedirect(request.getContextPath()+"/ok.jsp");
   }else{
    response.sendRedirect(request.getContextPath()+"/ok.jsp");
   }   
  }
  else{
   session.setAttribute("errors", "用户名密码错误");
   response.sendRedirect(request.getContextPath()+"/index.jsp");
  }
 }

 /**
  * Initialization of the servlet. <br>
  *
  * @throws ServletException if an error occure
  */
 public void init() throws ServletException {
  // Put your code here
 }

}
========================================================================================

index.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="gb2312" contentType="text/html; charset=gb2312"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
 <meta http-equiv="pragma" content="no-cache">
 <meta http-equiv="cache-control" content="no-cache">
 <meta http-equiv="expires" content="0">    
 <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
 <meta http-equiv="description" content="This is my page">
 <!--
 <link rel="stylesheet" type="text/css" href="styles.css">
 -->
  </head>
  
 <%
Cookie cookies[]=request.getCookies(); 
Cookie sCookie=null; 
String svalue=null; 
String sname=null; 
if(cookies!=null){
%>
<script language="javascript">
var UserNo=new Array(); UserNo[0]="";
var Password=new Array(); Password[0]="";
</script>
<%
for(int i=0;i<cookies.length;i++)
{ 
sCookie=cookies[i]; 
//if(sCookie.getName().equals(request.getParameter("userno"))){
// out.print("checked='true'");
//}
%>
<script language="javascript">
UserNo[<%=i%>]="<%=sCookie.getName()%>";
Password[<%=i%>]="<%=sCookie.getValue()%>"; 
</script>
<%
out.print(sCookie.getName()+"      "+sCookie.getValue()+"</br>");
}
}
 //取消的时侯再重写一次cookie 加一个标识,登陆时再判断这个标识就行了
%>
<body>
<form id="form1" name="form1" method="post" action="<%=path %>/servlet/LoginServlet">
       用户名：<input type="text" name="userno" /><br>
       密&nbsp;&nbsp;码：<input type="text" name="password"  onclick="return oUserNo_onchange()"/><br>
        <input type="checkbox" name="locals" value="s1">&nbsp;记住密码<br>
   <input type="submit" name="send" value="提交" />
</form>
<%
String errors=(String)session.getAttribute("errors");
if(errors!=null){
  out.print("<font color='red'>用户名或密码错误！或不存在！</font>");
  session.removeAttribute("errors");
}

 %>
</body>
</html>
<script language=javascript>       
    
function oUserNo_onchange()     
{  
for(i=0;i<UserNo.length;i++)
       if(form1.userno.value==UserNo[i]){
        form1.password.value=Password[i];
        form1.locals.checked=true;
       }       
}  
</script>