JSP连接sql2000所遇到的问题

 在程序中我设置好了数据源头,JSP程序也写好了,但是在TOMCAT中运行的时候就是没有结果程序如下:
<%@ page contentType="text/html; charset=gb2312"%>
<%@ page import="java.sql.*" %>
<html>
<head>
<title>Insert title here</title>
</head>
<body>
<%
   Connection con;
   Statement sql;
   ResultSet rs;
   try{
     Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
   }
   catch(ClassNotFoundException e){}
   try{
     con=DriverManager.getConnection("jdbc.odbc:student","sa","");
     sql=con.createStatement();
     rs=sql.executeQuery("select *from chengji");
     out.print("<Table border>");
     out.print("<tr>");
     out.print("<th width=100>"+"学号");
     out.print("<th width=100>"+"姓名");
      out.print("<th width=100>"+"数学");
       out.print("<th width=100>"+"英语");
       
        out.print("<tr>");
        while(rs.next()){
        out.print("<tr>");
        out.print("<td>"+rs.getString(1)+"</td>");
        out.print("<td>"+rs.getString(1)+"</td>");
        out.print("<td>"+rs.getInt("数学")+"</td>");
        out.print("<td>"+rs.getInt("英语")+"</td>");
     
        out.print("</tr>");
        }    
        out.print("</table>");
        con.close();
   }
   catch(SQLException e1){}
 %>
</body>
</html>