<%@   page   contentType="text/html;   charset=GBK"%>   
  <%@   page   import="java.sql.*"%>   
 <jsp:useBean id="db" class="data.DBConnectionBean"/>
   <%      
      String id= (String)session.getAttribute("id");
      if (id==null||id.length()==0){
          %>
           <script language="JavaScript">
             alert("帳號不能為空");
           </script>
           <%
      }else{
      try{
      if (db.checkplayer(id))
      {
           %>
           <script language="JavaScript">
             alert("已存在的帳號");
           </script>
           <%
      }else 
         {
           %>
           <script language="JavaScript">
             alert("可以使用的帳號");
           </script>
           <%
          }
      }catch(SQLException e){System.out.println(e.getMessage());}}
     %>
     <%session.invalidate(); %>
     <meta   HTTP-EQUIV=REFRESH   CONTENT="0;URL=/xunibuluo/regedit.jsp">