删除檔案夾

private static void deleteFileAfterUsing(final String indexFilePath) {

  if (indexFilePath == null) {

   return;

  }

  final File file = new File(indexFilePath);

  if (file.exists()) {

   if (file.isDirectory()) {

    final File[] filses = file.listFiles();

    for (final File f : filses) {

     if (f.isFile()) {

      f.delete();

     } else {

      deleteFileAfterUsing(f.getAbsolutePath());

     }

    }

   }

   //隻有檔案夾變成空的了才能被删除

   file.delete();

 }