创建Springboot项目出现错误This application has no explicit mapping for /error, so you are seeing this as a

出现的错误：

Whitelabel Error Page This application has no explicit mapping for /error, so you are seeing this as a fallback.

Thu Jan 27 11:40:03 CST 2022 There was an unexpected error (type=Not Found, status=404).

解决方法：
idea的目录里Controller类放错了位置，Application启动类的位置不对.要将Application类放在最外侧,包含所有子包 。

上图这样放置controller类会导致找不到页面

将包controller放在chapter01中，而Application和controller包为并列关系。

最后结果正常输出。