springboot: cannot be resolved to absolute file path because it does not reside in the file system: jar:file:/xx/xx.jar!/BOOT-INF/classes!/xxx

Springboot项目获取resources下的模板文件，本地测试使用ClassPathResource都可以正常读取，但打包成jar包传到服务器上就无法获取 ，错误信息如下：

cannot be resolved to absolute file path because it does not reside in the file system: jar:file:/xx/xx.jar!/BOOT-INF/classes!/xx

之前的代码如下：

Resource resource = new ClassPathResource(filePath);
File file = resource.getFile();

 使用下面方式读取即可解决：

InputStream inputStream = this.getClass().getClassLoader().getResourceAsStream("xxx/xxx.ftl");
FileUtils.copyInputStreamToFile(Objects.requireNonNull(inputStream, "文件找不到"), file);