[FileUpload] error in parsing the double-bytes characters name

[jacky]

lib:
   FileUpload 1.0 - 24 Jun 2003 

src:
 FileUploadBase fu = new DiskFileUpload();
 List fileItems = null;
 try
    {
            fileItems = fu.parseRequest(request);
            Iterator iter = fileItems.iterator();
            FileItem fileitem = null;

            while(iter.hasNext())
            {
                // here, item is not a file item, just a simple form field
                FileItem item = (FileItem) iter.next();
                String itemname = item.getString();
            }
    }

client: os(windowsXP sp1),encoding(gbk) browser(IE6.0)
server: os(windowsXP sp1), encoding(gbk) tomcat4.1.30
  The result is correct.

client: os(windowsXP sp1),encoding(gbk) browser(IE6.0)
server: os(linux redhat7.3), encoding(ISO8859-15) tomcat4.1.30 
  itemname is not the correct string.
  I use fu.setEncoding("ISO8859-15"), itemname is still not correct,
then i think maybe the encoding should be the same as the client's, 
so i use fu.setEncoding("gbk"), itemname is still not correct.