with maven environment, spring boot + mysql + mybatis
localhost:8080

https://blog.csdn.net/alantuling_jt/article/details/54893383

model: User class(entity)
mapper: UserMapper interface(Dao)
service: UserService (process data, use UserMapper methods) (service)
controller: UserController class (use UserService methods) (controller)
DemoApplication: startup class
application.properties: connect mysql
pom.xml: config dependencies, plugins, etc.