Cookie记住登陆账号和密码

Cookie作用：简化用户登陆（记住密码）,购物车，浏览记录等等

1:jsp中创建与使用cookie 创建Cookie对象 Cookie newCookie=new Cookie(String key,Object value);

2:写入Cookie对象 response.addCookie(newCookie);

3:读取Cookie对象 Cookie[]cookies=request.getCookies();

Cookie实现记忆用户名和密码的功能例子

------------------------login界面-----------------------

    <%
 String username="";
 String password="";
 Cookie[] c=request.getCookies();
 if(c!=null&&c.length>0)
 {
   for(Cookie c1:c)
   {
     if(c1.getName().equals("username"))
     {
       username=URLDecoder.decode(c1.getValue(),"utf-8");
     }
     if(c1.getName().equals("password"))
     {
       password=URLDecoder.decode(c1.getValue(),"utf-8");
     }
   }
 
 }
 
  %>
    <div class="login">
        <form action="dologin.jsp" method="post">
            <tr>
                <td>username</td>
                <td><input type="text" name="username" value="<%=username %>"></td>
            </tr>
            <br>
            <tr>
                <td>password</td>
                <td><input type="password" name="password" value="<%=password%>"></td>
            </tr>
            <br>
            <tr>
                <td colspan="2" align="center"><input type="checkbox"
                    name="rember" checked="checked">记住密码</td>
            </tr>
            <br>
            <tr>
                <td colspan=2 align="center"><input type="submit" value="login">
                </td>
            </tr>
        </form>
    </div>

------------------------dologin.jsp页面------------------------------

<%@ page language="java" import="java.util.*,java.net.*" contentType="text/html; charset=utf-8"%>
<%
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 'dologin.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>
  
  <body>
    登录成功
    <%
    //首先判断用户是否点击了checkbox记住登录状态
   String []s= request.getParameterValues("rember");
   if(s!=null&&s.length>0)
   {
     //保持用户名和密码保存在cookies中
      //String username=request.getParameter("username");
      //使用URLEncoder解决无法在cookie中保持中文的问题,先转码，在解码
     String username= URLEncoder.encode(request.getParameter("username"), "utf-8");
     //String password=request.getParameter("password");
  String password= URLEncoder.encode(request.getParameter("password"), "utf-8");
    Cookie usernamecookie=new Cookie("username",username);
    Cookie passwordcookie=new Cookie("password",password);
    usernamecookie.setMaxAge(86400);//设置最长生存时间为10天
    response.addCookie(usernamecookie);
    response.addCookie(passwordcookie);
   }
     %>
    <a href="user.jsp">查看用户信息</a>
  </body>
</html>

------------------------Cookie读取用户信息页面-------------------------------------

    <h1>用户信息</h1>
    <%
 String username="";
 String password="";
 Cookie[] c=request.getCookies();
 if(c!=null&&c.length>0)
 {
   for(Cookie c1:c)
   {
     if(c1.getName().equals("username"))
     {
       username=URLDecoder.decode(c1.getValue(),"utf-8");
     }
     if(c1.getName().equals("password"))
     {
       password=URLDecoder.decode(c1.getValue(),"utf-8");
     }
   }
 
 }
 
  %>
    用户名：<%=username %>
     密码：<%=password %>

 

posted @ 2015-01-29 15:43  BigShui  阅读(1971)  评论(0)  编辑  收藏  举报