public static File file(String parent, String path) {
		return file(new File(parent), path);
	}
public static File file ( String parent , String path ) { return file ( new File ( parent ) , path ) ; }
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 父目录
@param path 文件路径
@return File