code: public boolean exist(String path) {
  		final String fileName = FileUtil.getName(path);
  		final String dir = StrUtil.removeSuffix(path, fileName);
  		final List<String> names = ls(dir);
  		return containsIgnoreCase(names, fileName);
  	}
docs: 文件或目录是否存在
  
  @param path 目录
  @return 是否存在