急！急！急！jspSmartUpload上传目录找不到？各位帮帮忙

<%
SmartUpload su=new SmartUpload();
su.initialize(pageContext);
su.setMaxFileSize(100000);
<%@ page contentType="text/html; charset=gb2312" language="java"%>
<%@ page import="java.util.*,com.jspsmart.upload.*" errorPage="" %><% su.setTotalMaxFileSize(200000);
su.setAllowedFilesList("jpg,gif");
su.setDeniedFilesList("exe,bat,jsp,htm,html,,");
su.upload();
int count=su.save("/upload");
out.println(count+"个文件上传成功");%>我上传的的是图片格式正确，而且把路径换成绝对路径也可以用，就是相对路径不行，我在文件夹我也建了，各位大虾帮忙看看，小弟分数不多，只能提供百来分！