用SUBMIT提交Form 数据到SERVLET 值为NULL有关问题！

用SUBMIT提交Form 数据到SERVLET 值为NULL问题求助！！
JSP代码：<%@ page language="java" import="java.util.*,Dao.CustomerDao,pojo.Customer" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  </head>
  <%
   if(session.getAttribute("UpCno")==null)
   session.setAttribute("UpCno","");
   %>
  <body>
    <form name="myFrm" action="CusServlet" method="get">
     <center>
     <table border="1">
     <tr>
     <td align="center" style="background:red;"><font style="color:white"><strong>编号</strong></font></td>
     <td align="center" style="background:red;"><font style="color:white"><strong>姓名</strong></font></td>
     <td align="center" style="background:red;"><font style="color:white"><strong>电话</strong></font></td>
     <td align="center" style="background:red;" colspan="2"><a href='CusServlet?option=add'>增加</a></td>
     </tr>
     <%   CustomerDao dao=new CustomerDao();
           List<Customer> clist=dao.allCustomers();
           for(Customer cus:clist){
             out.println("<tr>");
             if(!cus.getCno().equals(session.getAttribute("UpCno"))){

              out.println("<td>"+cus.getCno()+"</td>");
              out.println("<td>"+cus.getCname()+"</td>");
              out.println("<td>"+cus.getCphone()+"</td>");
              out.println("<td><a href='CusServlet?option=delete&cid="+cus.getCno()+"'>delete</a></td>");
              out.println("<td><a href='CusServlet?option=edit&cid="+cus.getCno()+"'>edit</a></td>");
              out.println("</tr>");
          }else{
                out.println("<tr>");
            out.println("<td><input type=text,name='cno' value="+cus.getCno()+"></td>");
            out.println("<td><input type=text,name='cname' value=''></td>");
            out.println("<td><input type=text,name='cphone' value=''></td>");
out.println("<td><input type=submit name=option value=submit></td>");
            out.println("<td><input type=reset name=reset value=reset></td>");
            out.println("</tr>");
            }
           }


         %>
     </table>
</center>
</form>
  </body>
</html>
SERVLET代码：
        if("submit".equals(option)){
         HttpSession session = request.getSession();
String cno=request.getParameter("cno");
         String cname=request.getParameter("cname");
         String cphone=request.getParameter("cphone");
         System.out.print(""+cno+cname+cphone);
         Customer c=new Customer();
         c.setCno(cno);
         c.setCname(cname);
         c.setCphone(cphone);
        dao.updateCustomerByCno(cno,cname,cphone);
        session.setAttribute("UpCno","");

用SUBMIT提交Form 数据到SERVLET 值为NULL有关问题 ！

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用SUBMIT提交Form 数据到SERVLET 值为NULL有关问题！