url==/WebFriend/userimg/1307029058093.jpgjava.lang.IllegalArgumentExcept
url==/WebFriend/userimg/1307029058093.jpg
java.lang.IllegalArgumentException: This path does not exist (1135).
这是代码..就是在file.saveAs这边会出错,我想不通了我工程路径是对的,也有这个文件夹..为什么它老是报错  
<%@ page contentType="text/html; charset=gb2312" language="java" %>
<%@page import="java.util.*" %>  
<%@page import="java.sql.*" %>  
<%@page import="java.io.*" %>  
<%@page import="com.jspsmart.upload.*" %>  
<%@page import="java.awt.*" %>  
<%@page import="java.awt.image.*" %>  
<%@page import="com.sun.image.codec.jpeg.*" %>  
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<html>
<head>
<title>文件上传处理页面</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
</head>
<body>
<%
try
{
String url= "jdbc:mysql://localhost:3306/message";
String user="root";
String password="root";  
     SmartUpload su = new SmartUpload();
      su.initialize(pageContext);
      su.setMaxFileSize(2000000);
      su.setTotalMaxFileSize(20000000);
      su.setAllowedFilesList("jpg,gif,bmp,png");
     su.upload();
     for (int i=0;i<su.getFiles().getCount();i++)
     {
         com.jspsmart.upload.File file = su.getFiles().getFile(i);
         if (file.isMissing()) continue;
         java.util.Date d =new java.util.Date();
         Long l = d.getTime();
         System.out.print("url=="+request.getContextPath()+"/userimg/" +l.toString()+ "."+file.getFileExt());
         file.saveAs(request.getContextPath()+"/userimg/" +l.toString()+ "."+file.getFileExt());
         java.io.File yuan = new java.io.File(request.getContextPath()+"/userimg/" +"\\"+l.toString()+ "."+file.getFileExt());  //读入刚才上传的文件
        System.out.print(yuan);
        String newurl=request.getContextPath()+"/userimg/" +"\\"+l.toString()+ "_s."+file.getFileExt();  //新的缩略图保存地址
        Image src = javax.imageio.ImageIO.read(yuan);                     //构造Image对象
        int new_w=150;
        int new_h=150;
        BufferedImage tag = new BufferedImage(new_w,new_h,BufferedImage.TYPE_INT_RGB);
        tag.getGraphics().drawImage(src,0,0,new_w,new_h,null);       //绘制缩小后的图
        FileOutputStream newimage=new FileOutputStream(newurl);          //输出到文件流
       JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(newimage);       
       encoder.encode(tag);                                               //近JPEG编码
       newimage.close();    
	out.print("id======="+Integer.parseInt(session.getAttribute("id").toString()));     
	String opath=request.getContextPath()+"/userimg/"+l.toString()+ "."+file.getFileExt();
      String spath=request.getContextPath()+"/userimg/"+l.toString()+ "_s."+file.getFileExt();
     request.setCharacterEncoding("gb2312");
     Class.forName("com.mysql.jdbc.Driver");                //载入JDBC驱动程序
     Connection conn=DriverManager.getConnection(url,user,password);;       //创建数据库连接对象
     PreparedStatement  stmt=conn.prepareStatement("update user_table set userImg =? where id="+Integer.parseInt(session.getAttribute("id").toString()));