JSP的Cookie在登录中的使用-JSP技巧-JSP编程-硕编程

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JSP的Cookie在登录中的使用

jsp的cookie在登录中的使用

一功能需求

实现记忆用户名和密码功能。

二代码

1、login.jsp

<%@ 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%>" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
  
  <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" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
    -->
 </head>
 
 <body>
  <h1>用户登录</h1>
  <hr>
  <%
   request.setcharacterencoding("utf-8");
   string username="";
   string password = "";
   cookie[] cookies = request.getcookies();
   if(cookies!=null&&cookies.length>0)
   {
      for(cookie c:cookies)
      {
       if(c.getname().equals("username"))
       {
          username = urldecoder.decode(c.getvalue(),"utf-8");
       }
       if(c.getname().equals("password"))
       {
          password = urldecoder.decode(c.getvalue(),"utf-8");
       }
      }
   }
  %>
  <form name="loginform" action="dologin.jsp" method="post">
    <table>
     <tr>
      <td>用户名：</td>
      <td><input type="text" name="username" value="<%=username %>"/></td>
     </tr>
     <tr>
      <td>密码：</td>
      <td><input type="password" name="password" value="<%=password %>" /></td>
     </tr>
     <tr>
      <td colspan="2"><input type="checkbox" name="isusecookie" checked="checked"/>十天内记住我的登录状态</td>
     </tr>
     <tr>
      <td colspan="2" align="center"><input type="submit" value="登录"/><input type="reset" value="取消"/></td>
     </tr>
    </table>
  </form>
 </body>
</html>

2、dologin.jsp

<%@ 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%>" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
  
  <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" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
    -->
 
 </head>
 
 <body>
  <h1>登录成功</h1>
  <hr>
  <br>
  <br>
  <br>
  <%
    request.setcharacterencoding("utf-8");
    //首先判断用户是否选择了记住登录状态
    string[] isusecookies = request.getparametervalues("isusecookie");
    if(isusecookies!=null&&isusecookies.length>0)
    {
     //把用户名和密码保存在cookie对象里面
     string username = urlencoder.encode(request.getparameter("username"),"utf-8");
     //使用urlencoder解决无法在cookie当中保存中文字符串问题
     string password = urlencoder.encode(request.getparameter("password"),"utf-8");
     
     cookie usernamecookie = new cookie("username",username);
     cookie passwordcookie = new cookie("password",password);
     usernamecookie.setmaxage(864000);
     passwordcookie.setmaxage(864000);//设置最大生存期限为10天
     response.addcookie(usernamecookie);
     response.addcookie(passwordcookie);
    }
    else
    {
     cookie[] cookies = request.getcookies();
     if(cookies!=null&&cookies.length>0)
     {
       for(cookie c:cookies)
       {
        if(c.getname().equals("username")||c.getname().equals("password"))
        {
          c.setmaxage(0); //设置cookie失效
          response.addcookie(c); //重新保存。
        }
       }
     }
    }
  %>
  <a href="users.jsp" rel="external nofollow" target="_blank">查看用户信息</a>
  
 </body>
 
</html>

3、users.jsp

<%@ 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%>" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
  
  <title>my jsp 'users.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" rel="external nofollow" rel="external nofollow" rel="external nofollow" >
    -->
 
 </head>
 
 <body>
  <h1>用户信息</h1>
  <hr>
  <%
   request.setcharacterencoding("utf-8");
   string username="";
   string password = "";
   cookie[] cookies = request.getcookies();
   if(cookies!=null&&cookies.length>0)
   {
      for(cookie c:cookies)
      {
       if(c.getname().equals("username"))
       {
          username = urldecoder.decode(c.getvalue(),"utf-8");
       }
       if(c.getname().equals("password"))
       {
          password = urldecoder.decode(c.getvalue(),"utf-8");
       }
      }
   }
  %>
  <br>
  <br>
  <br>
     用户名：<%=username %><br>
     密码：<%=password %><br>
 </body>
</html>

三测试

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JSP技巧