原文：https://zhuanlan.zhihu.com/p/24957789?refer=dreawer
root package结构：com.example.myproject
com
+- example
+- myproject
+- Application.java
|
+- domain
| +- Customer.java
| +- CustomerRepository.java
|
+- service
| +- CustomerService.java
|
+- controller
| +- CustomerController.java
|
原文：https://www.cnblogs.com/guxingy/p/12981806.html