1，在属性类中添加注解

 @ApiModelProperty(value = "创建时间")
    @TableField(fill = FieldFill.INSERT)
    private Date gmtCreate;

    @ApiModelProperty(value = "更新时间")
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private Date gmtModified;

新建一个handler包

@Component
public class MyMetaObjectHandler implements MetaObjectHandler {
    @Override
    public void insertFill(MetaObject metaObject) {
//        属性名称
        this.setFieldValByName("gmtCreate",new Date(),metaObject);
        this.setFieldValByName("gmtModified",new Date(),metaObject);
    }

    @Override
    public void updateFill(MetaObject metaObject) {
        this.setFieldValByName("gmtModified",new Date(),metaObject);

    }
}

添加讲师接口的方法

//    5，添加讲师接口的方法
    @PostMapping("addTeacher")
    public R addTeacher(@RequestBody EduTeacher eduTeacher){
        boolean save = teacherService.save(eduTeacher);
        if(save){
            return R.ok();
        }else{
            return R.error();
        }

    }