springboot读取外部配置文件

https://blog.youkuaiyun.com/qq_42074921/article/details/89488192

https://blog.youkuaiyun.com/liqi_q/article/details/84565252

https://blog.youkuaiyun.com/wohaqiyi/article/details/79940380

https://blog.youkuaiyun.com/jiashiwen/article/details/78286149

这4个博客的内容完全可以解释清楚90%的内容。