https://spring.io/guides/tutorials/rest/
https://spring.io/guides/gs/rest-service/
https://www.baeldung.com/rest-with-spring-series
https://www.baeldung.com/bootstraping-a-web-application-with-spring-and-java-based-configuration
https://medium.com/@aqeelabbas3972/creating-a-rest-api-in-spring-boot-68ce785f652f
https://howtodoinjava.com/spring-boot/spring-boot-rest-api-example/
Spring boot jar启动时配置文件的指定：
https://blog.51cto.com/u_16175433/6694390