WebRoot/admin/adminyanzheng.jsp

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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ page language="java" import="java.sql.*" %>
<jsp:useBean id="connDbBean" scope="page" class="db.db"/>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'adminyanzheng.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 uid=request.getParameter("username");
 String pwd=request.getParameter("pwd");
 String sql="";

   sql="select * from admin where username='"+uid+"' and userPassword='"+pwd+"'";
    ResultSet RS_result=connDbBean.executeQuery(sql);
 if(!RS_result.next())
{
	out.print("<script>alert('你输入的用户不存在或密码错误,请重新登录!');window.history.go(-1);</script>");
	}
else{
  	  session.setAttribute("username",uid);
  	  session.setAttribute("userId",RS_result.getString("id"));
	 response.sendRedirect("main.jsp");	 
	} 
RS_result.close();

 %>
  </body>
</html>