📄 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"/>
<html>
<head>
<title>检测用户名</title>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=gb2312">
</head>
<body>
<%String username=chstr.chStr(request.getParameter("username"));
ResultSet rs=conndb.executeQuery("select * from userdata where username='"+username+"'");
if(rs.next()){%>
<table width="100%" border="0" cellspacing="1" cellpadding="1" align="center">
<tr bgcolor="E0E0E0" valign="top">
<td bgcolor="E0E0E0" align="center"><%out.println("用户名已存在");%></td>
</tr>
<tr bgcolor="E0E0E0" valign="top">
<td bgcolor="E0E0E0"><div align="center">
<input name="submit" type="submit" value="确定" onClick="window.location.href='register.jsp';">
</div></td>
</tr>
</table>
<%}else{%>
<table width="100%" border="0" cellspacing="1" cellpadding="1" align="center">
<tr bgcolor="E0E0E0" valign="top">
<td bgcolor="E0E0E0" align="center"><%out.println("用户名不存在，可以使用");%></td>
</tr>
<tr bgcolor="E0E0E0" valign="top">
<td bgcolor="E0E0E0"><div align="center">
<input name="submit" type="submit" value="确定" onClick="window.location.href='register.jsp';">
</div></td>
</tr>
</table>
<%}%>
</body>
</html>
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