列出目錄中(包含子目錄)之所有檔案

private void listFilesInDirectoryRecursively(String path) {

    File main = new File(path);

    if (main.isDirectory()) {

        String[] filename = main.list();

        for (int i = 0; i < filename.length; i++) {

            File sub = new File(main.getAbsoluteFile() + File.separator + filename[i]);

            if (sub.isDirectory()) {

                this.listFilesInDirectoryRecursively(main.getAbsoluteFile() + File.separator + filename[i]);

            } else {

                System.out.println(sub.getAbsoluteFile());

            }

        }

    } else {

        System.out.println(main.getAbsoluteFile());

    }

}