Whitelabel Error Page This application has no explicit mapping for /error

Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.
Mon Aug 31 14:25:34 CST 2020
There was an unexpected error (type=Not Found, status=404).

原因及解决：

报错原因是SpringBoot的目录结构不对，修改目录结构。