code: public static File file(File parent, String path) {
  		if (StrUtil.isBlank(path)) {
  			throw new NullPointerException("File path is blank!");
  		}
  		return checkSlip(parent, new File(parent, path));
  	}
docs: 创建File对象<br>
  此方法会检查slip漏洞，漏洞说明见http://blog.nsfocus.net/zip-slip-2/
  
  @param parent 父文件对象
  @param path 文件路径
  @return File