String path = System.getProperty("user.dir");   // 获取当前项目的实际路径

    InputStream is = JwtUtil.class.getResourceAsStream("/application.yml");    // 获取项目配置文件信息（application.yml）

https://www.cnblogs.com/daxiaxia/p/8903906.html

https://www.iteblog.com/java_get_file_absolute_path/