java以流的形式输出文件

  public void downProcessFile(HttpServletRequest request,HttpServletResponse response,String path){
        try {
            File file = new File(path);
            String filename = file.getName();// 获取日志文件名称
            InputStream fis = new BufferedInputStream(new FileInputStream(path));
            byte[] buffer = new byte[fis.available()];
            fis.read(buffer);
            fis.close();
            response.reset();
            // 先去掉文件名称中的空格,然后转换编码格式为utf-8,保证不出现乱码,这个文件名称用于浏览器的下载框中自动显示的文件名
            response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.replaceAll(" ", "").getBytes("utf-8"),"iso8859-1"));
            response.addHeader("Content-Length", "" + file.length());
            OutputStream os = new BufferedOutputStream(response.getOutputStream());
            response.setContentType("application/octet-stream");
            os.write(buffer);// 输出文件
            os.flush();
            os.close();
        } catch (Exception e) {
        }
    }