修改application.properties
把spring.resources.static-locations 的值添加上你的文件路径,
如果是docker 容器,也是一样，只是添加的是-v 映射后的docker 文件路径.

默认值为 /**

#spring.mvc.static-path-pattern=

默认值为 classpath:/META-INF/resources/,classpath:/resources/,classpath:/static/,classpath:/public/

spring.resources.static-locations=file:/server/data,classpath:/META-INF/resources/,classpath:/resources/,classpath:/static/,classpath:/public/