http方式进行文件下载时为什么加上了断点续传的属性后还是下载的整个文件呢?

对了，服务器端是一个servlet，实现代码如下：
           response.setHeader("Content-Disposition", "attachment;filename="
                               + new String(name.getBytes("GBK"), "ISO-8859-1"));
　　        String name = request.getParameter("name");
            PrintWriter out = response.getWriter();
            InputStream in = new FileInputStream("c://uploads/" + name);
            int c;            while ((c = in.read()) != -1)
                out.write(c);            out.flush();
            out.close();