4.0.0 org.springframework.boot spring-boot-starter-parent 2.7.0 com.example refactor-demo 1.0.0 refactor-demo Spring Boot重构演示项目 8 org.springframework.boot spring-boot-starter-web org.springframework.boot spring-boot-starter-data-jpa com.h2database h2 runtime org.springframework.boot spring-boot-starter-test test org.springframework.boot spring-boot-maven-plugin