实现院系、专业、班级管理接口：
院系：
server/src/main/java/com/example/mapper/DepartmentMapper.java
server/src/main/java/com/example/service/admin/DepartmentService.java
server/src/main/resources/mapper/DepartmentMapper.xml
server/target/classes/mapper/DepartmentMapper.xml
专业：
server/src/main/java/com/example/mapper/MajorMapper.java
server/src/main/java/com/example/service/admin/MajorService.java
server/src/main/resources/mapper/MajorMapper.xml
server/target/classes/mapper/MajorMapper.xml
班级：
server/src/main/java/com/example/controller/admin/ClassController.java
server/src/main/java/com/example/service/admin/ClassService.java
server/src/main/java/com/example/mapper/ClassMapper.java
server/src/main/resources/mapper/ClassMapper.xml