The file is placed in the Resources folder and will appear in the boot after it is typed as a jar package_ INF/classes/ xx.xx The second one is the second one;
The file path uses “absolute path”/ xx.xx “, load URL and create InputStream with classloader:
URL fileURL=this.getClass().getResource("/xx.xx");
InputStream is=this.getClass().getResourceAsStream("/resource/res.txt");