form中带enctype="multipart/form-data"不能通过require取得值
-----------提交页面----------
<form name="upimg" method="post" action="upimg.jsp" enctype="multipart/form-data">
<table width="90%" border="0" cellspacing="0" cellpadding="0" align="center">
<tr>
<td align="center">
<input type="hidden" name="id" value="55">
<input type="file" name="upfile">
<input type="submit" value="提交">
</td>
</tr>
</table>
</form>
-----------提交页面----------
upimg.jsp中如何取到id的值.
通过require好象不能.
谢谢