请教如何使用Jspsmartupload
<FORM METHOD="POST" ACTION="upload.jsp" ENCTYPE="multipart/form-data">
> <INPUT TYPE="FILE" NAME="FILE1" SIZE="50"><BR>
> <input type="hidden" name="flag" value="yes" >
>
> <INPUT TYPE="SUBMIT" name="Upload" VALUE="Upload">
></FORM>
>我怎样得到flag的值
>多谢!