/**
     * 创建一个临时文件
     * @param url 远端文件Url
     * @return File
     */
    private File getFile(String url) {
        //对本地文件命名
        String fileName = url.substring(url.lastIndexOf("."), url.length());
        File file = null;

        URL urlfile;
        try {
            // 创建一个临时路径
            file = File.createTempFile("file", fileName);
            //下载
            urlfile = new URL(url);

            try (InputStream inStream = urlfile.openStream();
                 OutputStream os = new FileOutputStream(file);) {
                int bytesRead = 0;
                byte[] buffer = new byte[8192];
                while ((bytesRead = inStream.read(buffer, 0, 8192)) != -1) {
                    os.write(buffer, 0, bytesRead);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return file;
    }