JSP的Cookie在登錄中的使用
一 功能需求
實現記憶用戶名和密碼功能。
二 代碼
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>用戶登錄/h1>
hr>
%
request.setCharacterEncoding("utf-8");
String username="";
String password = "";
Cookie[] cookies = request.getCookies();
if(cookies!=nullcookies.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>用戶名：/td>
td>input type="text" name="username" value="%=username %>"/>/td>
/tr>
tr>
td>密碼：/td>
td>input type="password" name="password" value="%=password %>" />/td>
/tr>
tr>
td colspan="2">input type="checkbox" name="isUseCookie" checked="checked"/>十天內記住我的登錄狀態/td>
/tr>
tr>
td colspan="2" align="center">input type="submit" value="登錄"/>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>登錄成功/h1>
hr>
br>
br>
br>
%
request.setCharacterEncoding("utf-8");
//首先判斷用戶是否選擇了記住登錄狀態
String[] isUseCookies = request.getParameterValues("isUseCookie");
if(isUseCookies!=nullisUseCookies.length>0)
{
//把用戶名和密碼保存在Cookie對象里面
String username = URLEncoder.encode(request.getParameter("username"),"utf-8");
//使用URLEncoder解決無法在Cookie當中保存中文字符串問題
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);//設置最大生存期限為10天
response.addCookie(usernameCookie);
response.addCookie(passwordCookie);
}
else
{
Cookie[] cookies = request.getCookies();
if(cookies!=nullcookies.length>0)
{
for(Cookie c:cookies)
{
if(c.getName().equals("username")||c.getName().equals("password"))
{
c.setMaxAge(0); //設置Cookie失效
response.addCookie(c); //重新保存。
}
}
}
}
%>
a href="users.jsp" rel="external nofollow" target="_blank">查看用戶信息/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>用戶信息/h1>
hr>
%
request.setCharacterEncoding("utf-8");
String username="";
String password = "";
Cookie[] cookies = request.getCookies();
if(cookies!=nullcookies.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>
用戶名：%=username %>br>
密碼：%=password %>br>
/body>
/html>
三 測試
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