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<%@ page language="java" import="java.util.*,java.sql.*,com.FamilyEducation.db.*" pageEncoding="gb2312"%>
<%
response.setContentType("text/xml");
response.setHeader("Cache-Control","no-store");
response.setHeader("pragma","no-cache");
response.setDateHeader("Expirse",0);
String name = request.getParameter("username");
DBConn dbcn = new DBConn();
Connection conn = dbcn.getConn();
String sql = "select * from teacherreg where id = '"+ name +"' ";
Statement stmt=conn.createStatement();
ResultSet rs=stmt.executeQuery(sql);
if(rs.next())
response.getWriter().write("用户名已存在");
else
response.getWriter().write("可用");
%>