jsp的登录校验demo
part_1:login.jsp:登录页面:
<%@ page language="java" import="java.util.*" pageencoding="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 'login.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>
<%
string fdbkmsg = (string) request.getattribute("fdbkmsg");
if (null == fdbkmsg) {
fdbkmsg = "";
}
%>
<%
boolean logedin = (boolean) session.getattribute("logedin");
if (null == logedin) {
logedin = false;
} else if (logedin) {
//如果在本次会话已经登陆，直接重定向到success-page-1
response
.sendredirect("/servletdemoproject/login-demo/success-page-1.jsp");
}
%>
<%
string username = "";
cookie[] cookies = request.getcookies();
if ((null != cookies) && (cookies.length > 0)) {
for (cookie c : cookies) {
if ("admin".equals(c.getvalue())) {
username = "admin";
break;
}
}
}//end if-condition
%>
<body>
<br>
<div align="center">
请登录:
<br>
<form action="/servletdemoproject/servlet/loginverificationservlet"
method="post">
用户名：
<input type="text" name="username" value="<%=username%>" />
<br>
密 码：
<input type="password" name="password" value="" />
<br>
<font color='red'><%=fdbkmsg%></font>
<br>
<input type="submit" value="提交" />
<br>
</form>
</div>
</body>
</html>
part_2:loginverificationservlet.java:校验登录信息，此处没有连接数据库，默认只有username：admin，password：888888才算登录成功；登陆失败时：重新转发到login.jsp并提示用户登陆失败，重新登陆；
package cn.mike.servlet.test_1209_login;
import java.io.ioexception;
import javax.servlet.servletexception;
import javax.servlet.http.cookie;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
public class loginverificationservlet extends httpservlet {
private static final long serialversionuid = -6886327892796230543l;
public void doget(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
string username = request.getparameter("username");
string password = request.getparameter("password");
if (("admin".equals(username)) && ("888888".equals(password))) {// 登录成功
// 保存cookie到客户端
cookie usercookie = new cookie("username", username);
usercookie.setmaxage(60 * 2);// expiry : 2 minutes
response.addcookie(usercookie);
// 重定向到一个新的页面，并提示xxx用户登录成功（使用session存取用户名）;
request.getsession().setattribute("username", username);
request.getsession().setattribute("logedin", true);
response
.sendredirect("/servletdemoproject/login-demo/success-page-1.jsp");
} else {// 登陆失败
// 转发到登录界面，并提示错误信息：
request.setattribute("fdbkmsg", "用户名或密码错误！");
request.getrequestdispatcher("/login-demo/login.jsp").forward(
request, response);
}
}
public void dopost(httpservletrequest request, httpservletresponse response)
throws servletexception, ioexception {
// do same as get-method :
doget(request, response);
}
}
part_3:success-page-1.jsp:校验登录成功后重定向到该页面，提示用户已经成功登陆；如果用户试图通过不正当途径，e.g:从地址栏访问，将会转发到登录界面，并作提示；
<%@ page language="java" import="java.util.*" pageencoding="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 'success-page-1.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>
<%
string username = (string) session.getattribute("username");
if (null == username) {
//如果username为空值，说明不是通过正常渠道来的，转发到login页面；
request.setattribute("fdbkmsg", "别想走后门进来，赶紧登录！");
request.getrequestdispatcher("/login-demo/login.jsp").forward(
request, response);
}
%>
<body>
<br>
<%=username%>已经成功登陆。
<br>
<font>您可以选择浏览：</font>
<br>
<a href="/servletdemoproject/login-demo/success-page-2.jsp">点这儿有精彩.</a>
<br>
<a href="/servletdemoproject/login-demo/success-page-2.jsp">点这儿更精彩.</a>
<br />
<a href="/servletdemoproject/login-demo/success-page-2.jsp">你敢点这儿吗.</a>
<br />
</body>
</html>
part_4:success-page-2.jsp:登陆成功页面2，如果已经登陆成功将用户名保存到session，在访问该页面时将会校验一下，防止从地址栏暴力访问；
<%@ page language="java" import="java.util.date" pageencoding="utf-8"%>
<%@ page language="java" import="java.text.simpledateformat"%>
<%
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 'success-page-2.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>
<%
string username = (string) session.getattribute("username");
if (null == username) {
request.setattribute("fdbkmsg", "呵呵嗒，这里是你来的地方吗？快登陆！");
//转发到登录界面:
request.getrequestdispatcher("/login-demo/login.jsp").forward(
request, response);
}
simpledateformat sdateformat = new simpledateformat("a");
date today = new date();
string am_pm_str = sdateformat.format(today);
string am_pm_str_in_chinese = "";
if ("am".equalsignorecase(am_pm_str)) {
am_pm_str_in_chinese = "上午";
} else
am_pm_str_in_chinese = "下午";
// set null;
sdateformat = null;
today = null;
am_pm_str = null;
%>
<body>
<br />
<font><b><%=username%><%=am_pm_str_in_chinese%>好，能来到页面2真不简单.</b>
</font>
</body>
</html>
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