报的错误如下：
java.lang.Exception: the error is:org.apache.commons.fileupload.FileUploadBase$InvalidContentTypeException: the request doesn't contain a multipart/form-data or multipart/mixed stream, content type header is application/x-www-form-urlencoded
com.gzedu.web.student.UploadShare.upload(UploadShare.java:107)
com.gzedu.web.student.UploadPicHandler.process(UploadPicHandler.java:30)
com.gzedu.web.DefaultRequestController.doPost(DefaultRequestController.java:168)
javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
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JSP文件在这里：
<%@page contentType="text/html; charset=GBK" %>
<html>
<head>
<title>Untitled Document</title>
</head>
<body leftmargin="0" topmargin="0">
<table width="490" border="0" align="center" cellpadding="0" cellspacing="0">
<tr>
<td><form enctype="multipart/form-data" id="form1" name="form1" method="post" action="http://worksupload.gzedu.com/upload/controller.go?event=uploadPic&type=2&urltype=01&teacher_id=440101199953637383" >
<table width="100%" border="0" align="center" cellpadding="0" cellspacing="1" bordercolorlight="8FA9B5" bordercolordark="#FFFFFF" bgcolor="#E8E8E8">
<tr bgcolor="#FFFFFF">
<td with="70%" height="20"><div align="center"><font size="2">上传图片1</font></div>
<input type="file" name="uploadRef1" size="30"/></td>
<td with="30%" align="right" rowspan="2">
</td>
</tr>
<tr bgcolor="#FFFFFF">
<td height="20" colspan="2"><div align="center">
<input type="submit" name="Submit" value="上传图片" />
</div></td>
</tr>
</table>
</form>
</td>
</tr>
</table>
</body>
</html>
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enctype="multipart/form-data" 这一句我是加了的啊，为何还有这样的错误呢？不解……
注：文件上传是用的另一台专负责文件上传的应用服务器，故提交的地址是绝对地址
