spring mongo

依赖地址：

https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-data-mongodb/2.3.4.RELEASE

官方手册地址：

https://docs.spring.io/spring-data/mongodb/docs/current/reference/html/#mongodb-getting-started

非官方文档：

http://www.mydlq.club/article/85/