refactor: 整理代码

src/main/java/com/huertian/jinduguanli/dto/DepartmentImportDTO.java

@@ -1,8 +1,6 @@
 package com.huertian.jinduguanli.dto;
 
 import com.alibaba.excel.annotation.ExcelProperty;
-import lombok.Data;
-
 
 public class DepartmentImportDTO {
     @ExcelProperty("部门名称")

src/main/java/com/huertian/jinduguanli/dto/LessonTaskImportDTO.java

@@ -1,7 +1,6 @@
 package com.huertian.jinduguanli.dto;
 
 import com.alibaba.excel.annotation.ExcelProperty;
-import lombok.Data;
 
 public class LessonTaskImportDTO {
     @ExcelProperty("课程名称")

src/main/java/com/huertian/jinduguanli/dto/UserImportDTO.java

@@ -1,7 +1,6 @@
 package com.huertian.jinduguanli.dto;
 
 import com.alibaba.excel.annotation.ExcelProperty;
-import lombok.Data;
 
 public class UserImportDTO {
     @ExcelProperty(index = 0)

src/main/java/com/huertian/jinduguanli/service/LessonTaskService.java

@@ -19,7 +19,6 @@ import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 import org.springframework.beans.BeanUtils;
 
-import java.util.ArrayList;
 import java.util.List;
 
 import org.apache.commons.lang3.StringUtils;