阿里外包也是这么难的吗？

要求外语流畅，多线程会玩，我是真的费劲。

public class DownFile {

public HttpServletResponse download(String path,String name, HttpServletResponse response) {
    try {
        // path是指欲下载的文件的路径。
        File file = new File(path);
        // 取得文件名。
        String filename="";
        if(name!=null&&name.length()!=0){
            filename = name;
        }else{
            filename = file.getName();
        }
        // 取得文件的后缀名。
        String ext = filename.substring(filename.lastIndexOf(".") + 1).toUpperCase();

        // 以流的形式下载文件。
        InputStream fis = new BufferedInputStream(new FileInputStream(path));
        byte[] buffer = new byte[fis.available()];
        fis.read(buffer);
        fis.close();
        // 清空response
        response.reset();
        // 设置response的Header
        response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes(),"iso-8859-1"));
        response.addHeader("Content-Length", "" + file.length());
        OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
        response.setContentType("application/octet-stream");
        toClient.write(buffer);
        toClient.flush();
        toClient.close();
    } catch (IOException ex) {
        ex.printStackTrace();
    }
    return response;
}

}

try {
        long sd = new Date().getTime();
        String filename = request.getRealPath("/") + "表名" + DateUtil.format(new Date(), "yyyyMMddhhmmss") + ".xls";
        FileOutputStream fout = new FileOutputStream(filename);
        wb.write(fout);
        fout.close();

        long ed = new Date().getTime();
        System.out.println("---write---" + (ed - sd) + "毫秒，共计" + (ed - sd) / 1000 + "秒");

        DownFile DownFile = new DownFile();
        DownFile.download(filename, "", ServletActionContext.getResponse());
        File file = new File(filename);
        file.delete();
        long aed = new Date().getTime();
        System.out.println("---表名---" + (aed - asd) + "毫秒，共计" + (aed - asd) / 1000 + "秒");
    } catch (Exception e) {
        e.printStackTrace();
    }