public class DeptNicheVo implements Serializable {
    @Excel(width = 30, needMerge = true, name = "部门")
    private String deptName;
    @ExcelCollection(name = "")
    private List<UserNicheVo> userNicheVos;
}

public class UserNicheVo implements Serializable {
    @Excel(name = "姓名" ,width = 20, needMerge = true)
    private String userName;
    @Excel(name = "商机数" ,width = 20, needMerge = true)
    private String nicheNum;
    @ExcelCollection(name = "")
    private List<NicheNameVo> nicheNameVos;
}

public class NicheNameVo implements Serializable {
    @Excel(name = "一个月更新", width = 40)
    private String oneMonthUpdateNicheName;
    @Excel(name = "一个月未更新", width = 40)
    private String oneMonthNotUpdateNicheName;
    @Excel(name = "三个月未更新", width = 40)
    private String threeMonthNotUpdateNicheName;
    @Excel(name = "六个月未更新", width = 40)
    private String sixMonthNotUpdateNicheName;
}