D:\apache-tomcat-6.0.24\webapps\ROOT\Test 下三个JSP文件如下：
index.jsp
<%@page language="Java" contentType="text/html; charset=gb2312" import="java.sql.*"%>
<html>
<head> <title>登录 </title> </head>
<body>
<form action="login.jsp" method="post"">
登录名： <input type="text" name="txtUser">
<p> 密码： <input type="password" name="txtPwd"> </p>
<p> <input type="submit" value="登 录" name="btnOk"> </p>
</form>
</body>
</html>
login.jsp
<%@page language="Java" contentType="text/html; charset=gb2312" import="java.sql.*"%>
<jsp:useBean id="text" class="text.DBConn"/>
<%
String strUserId=request.getParameter("txtUser");
String strPwd=request.getParameter("txtPwd");
if(strUserId == null || strPwd == null)
{
out.println(" <script language=\"JavaScript\&q
