我做的jsp登录页面
<%@ page language="java" import="java.util.*,java.sql.*" pageEncoding="GB2312"%>
<html>
<head>
</head>
<body>
<center><h1>管理员登陆</h1></center><BR/>
<form name="f1" id="f1" action="guanliyuanjiance.jsp" method="post">
<table border="0" align=center>
<tr>
<td>用户:</td>
<td>
<input type="text" name="username" id="username" value=""></td>
</tr>
<tr>
<td>密码:</td>
<td>
<input type="passwd" name="passwd" id="passwd" value=""></td>
</tr>
<tr>
<td colspan="2" align="center">
<input type="submit" value="登陆"></td>
</tr>
</table>
<table align="center">
<a href="index.jsp">返回首页</font></a>
</table>
</form>
</body>
</html>
检测页面
<%@ page language="java" import="java.util.*,java.sql.*" pageEncoding="gb2312"%>
<%
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 'guanliyuanjiance.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>
<%
String a=request.getParameter("username");
String b=request.getParameter("passwd");
%>
<%
//1,加载驱动
Class.forName("com.microsoft.jdbc.sqlserver.SqlServerDriver");
//2，得到连接
Connection conn=DriverManager.getConnection("jdbc:microsoft:sqlserver://localhost;DatabaseName=userdb","jie","123");
//3，创建Statement
Statement stmt=conn.createStatement();
//4,查询
ResultSet rs=stmt.executeQuery("SELECT username from admin WHERE username='"+a+"'");
//5,执行
if(rs.next()){
//说明用户名存在
if(rs.getString(1).equals(b)){
//一定合法
response.sendRedirect("guanliyuan.jsp");
}else{
//密码错误
response.sendRedirect("guanliyuandenglu.jsp");