📄 checkusername.jsp
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<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<jsp:useBean id="connDB" scope="page" class="beans.connDB"/>
<jsp:useBean id="chStr" scope="page" class="beans.chStr"/>
<%
String username=chStr.chStr(request.getParameter("custom_name"));
ResultSet rs=connDB.executeQuery("select * from Customer where custom_name='"+username+"'");
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>检测用户名</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<link href="CSS/style.css" rel="stylesheet">
</head>
<body bgcolor="#FFFFCC" leftmargin=10 topmargin="8" background="pictures/background.jpg">
<table width="90%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td height="7" align="center"> </td>
</tr>
<%
if(rs.next()){
out.println("<script language='javascript'>alert('很抱歉，用户名已经被注册!');window.location.href='user_add.jsp';</script>");
}else{
out.println("<script language='javascript'>alert('祝贺您，用户名没有被注册!请继续填写其他信息！');window.location.href='user_add.jsp';</script>");
}
%>
</table>
</body>
</html>
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