getResourceAsStream()返回值为null

javaWeb项目，写文件下载的时候遇到getServletContext().getResourceAsStream("/store/"+filename)获取的值为null

//获得读取本地文件的输入流
        in = getServletContext().getResourceAsStream("/store/"+filename);

目录结构如下

查询后发现，他们的下载目录都放入web目录下（可能与Resource Folders有关，和上一个bug类似）

但将文件放入web目录下并没有设置Resource Folder之后，下载操作就没有bug

目录结构如下图所示

代码为：

in = getServletContext().getResourceAsStream("/WEB-INF/store/"+filename);

参考https://stackoverflow.com/questions/14997523/getresourceasstream-returns-null-inspite-of-using-servletcontext

https://blog.csdn.net/AsCoolCucmber/article/details/115466886?spm=1005.2026.3001.5635&utm_medium