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loginCookie.jsp

2016-08-29 11:24 120 查看

<%@ page language="java" pageEncoding="UTF-8" isErrorPage="false" %>

<jsp:directive.page import="java.security.MessageDigest"/>

<%!

// 密钥

private static final String KEY = ":cookie@helloweenvsfei.com";

// MD5 加密算法

public final static String calcMD5(String ss) {



    String s = ss==null ? "" : ss;



    char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

    try {

     byte[] strTemp = s.getBytes();

     MessageDigest mdTemp = MessageDigest.getInstance("MD5");

     mdTemp.update(strTemp);

     byte[] md = mdTemp.digest();

     int j = md.length;

     char str[] = new char[j * 2];

     int k = 0;

     for (int i = 0; i < j; i++) {

      byte byte0 = md[i];

      str[k++] = hexDigits[byte0 >>> 4 & 0xf];

      str[k++] = hexDigits[byte0 & 0xf];

     }

     return new String(str);

    } catch (Exception e) {

     return null;

    }

}

%>

<%

request.setCharacterEncoding("UTF-8");

response.setCharacterEncoding("UTF-8");

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

if("login".equals(action)){



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

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

  int timeout = new Integer(request.getParameter("timeout"));



  // 把帐号连同密钥使用MD5后加密后保存

  String ssid = calcMD5(account + KEY);



  // 把帐号保存到Cookie中并控制有效期

  Cookie accountCookie = new Cookie("account", account);

  accountCookie.setMaxAge(timeout);



  // 把加密结果保存到Cookie中并控制有效期

  Cookie ssidCookie = new Cookie("ssid", ssid);

  ssidCookie.setMaxAge(timeout);



  response.addCookie(accountCookie);

  response.addCookie(ssidCookie);



  // 重新请求本页面

  response.sendRedirect(request.getRequestURI() + "?" + System.currentTimeMillis());

  return;

}

else if("logout".equals(action)){

  // 删除Cookie中的帐号

  Cookie accountCookie = new Cookie("account", "");

  accountCookie.setMaxAge(0);



  // 删除Cookie中的加密结果

  Cookie ssidCookie = new Cookie("ssid", "");

  ssidCookie.setMaxAge(0);

  response.addCookie(accountCookie);

  response.addCookie(ssidCookie);

  // 重新请求本页面

  response.sendRedirect(request.getRequestURI() + "?" + System.currentTimeMillis());

  return;

}

boolean loggin = false;

String account = null;

String ssid = null;

// 获取Cookie中的account与ssid

if(request.getCookies() != null){

  for(Cookie cookie : request.getCookies()){

   if(cookie.getName().equals("account"))

    account = cookie.getValue();

   if(cookie.getName().equals("ssid"))

    ssid = cookie.getValue();

  }

}

if(account != null && ssid != null){

  // 如果加密规则正确, 则视为已经登录

  loggin = ssid.equals(calcMD5(account + KEY));

}

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title><%= loggin ? "欢迎您回来" : "请先登录" %></title>

<link rel="stylesheet" type="text/css" href="css/style.css">

</head>

<body>

<div align="center" style="margin:10px; ">

<fieldset>

  <legend>当前有效的 Cookie</legend>

  <script>document.write(document.cookie);</script>

</fieldset>

<fieldset>

  <legend><%= loggin ? "欢迎您回来" : "请先登录" %></legend>

  <% if(loggin){ %>

   欢迎您, ${ cookie.account.value }.

   <a href="${ pageContext.request.requestURI }?action=logout">注销</a>

  <% } else { %>

  <form action="${ pageContext.request.requestURI }?action=login" method="post">

   <table>

    <tr>

     <td>

      帐号：

     </td>

     <td>

      <input type="text" name="account" style="width:200px; ">

     </td>

    </tr>

    <tr>

     <td>

      密码：

     </td>

     <td>

      <input type="password" name="password" style="width:200px; ">

     </td>

    </tr>

    <tr>

     <td>

      有效期：

     </td>

     <td>

      <input type="radio" name="timeout" value="-1" checked> 关闭浏览器即失效 <br/>

      <input type="radio" name="timeout" value="<%= 30 * 24 * 60 * 60 %>"> 30天内有效 <br/>

      <input type="radio" name="timeout" value="<%= Integer.MAX_VALUE %>"> 永久有效 <br/>

     </td>

    </tr>

    <tr>

     <td>

     </td>

     <td>

      <input type="submit" value=" 登录 " class="button">

     </td>

    </tr>

   </table>

  </form>

  <% } %>

</fieldset>

</div>

</body>

</html>

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