数据库表结构

Model

@Data
@AllArgsConstructor
@NoArgsConstructor
public class TBaseDept
{
    /** ID */
    private String id;
    /** 单位名称 */
    private String fdName;
    /** 部门编码 */
    private String fdCode;
    /** 层级 */
    private String fdLevel;
    /** 上级单位ID */
    private String parentId;
    /** 上级单位名称 */
    private String parentName;
    /** 层级ID */
    private String fdHier;
    /** 层级路径 */
    private String fdHierPath;
    /** 预留字段1 */
    private String fdOne;
    /** 预留字段2 */
    private String fdTwo;
    /** 预留字段3 */
    private String fdThree;
    /** 状态：1-正常 2:无效 */
    private String fdStatus;
    /** 排序号 */
    private Integer fdOrder;
}

VO

@Data
@AllArgsConstructor
@NoArgsConstructor
public class TBaseDeptVO implements Serializable
{

    private static final long serialVersionUID = 8599451909890724624L;
    /** ID */
    private String id;
    /** 单位名称 */
    private String fdName;
    /** 部门编码 */
    private String fdCode;
    /** 层级 */
    private String fdLevel;
    /** 上级单位ID */
    private String parentId;
    /** 上级单位名称 */
    private String parentName;
    /** 层级ID */
    private String fdHier;
    /** 层级路径 */
    private String fdHierPath;
    /** 预留字段1 */
    private String fdOne;
    /** 预留字段2 */
    private String fdTwo;
    /** 预留字段3 */
    private String fdThree;
    /** 状态：1-正常 2:无效 */
    private String fdStatus;
    /** 排序号 */
    private Integer fdOrder;

    private List<TBaseDeptVO> children;
}

查询树结构列表

    public List<TBaseDeptVO> queryTree(TBaseDept tBaseDept)
    {
        List<TBaseDept> tBaseDeptList = tBaseDeptDao.findByCriteria(tBaseDept);
        return buildTree(tBaseDeptList, "0");
    }
    
    /**
     * 构建树结构
     * @param list 数据列表
     * @param parentId 父ID
     * @return list
     */
    private List<TBaseDeptVO> buildTree(List<TBaseDept> list, String parentId)
    {
        List<TBaseDeptVO> tree = new ArrayList<>();
        for (TBaseDept child : list)
        {
            if (child.getParentId().equals(parentId))
            {
                TBaseDeptVO tBaseDeptVO = new TBaseDeptVO();
                BeanUtil.copyProperties(child, tBaseDeptVO);
                // 递归构建子树
                List<TBaseDeptVO> children = buildTree(list, child.getId());
                List<TBaseDeptVO> collect = children.stream().sorted(Comparator.comparing(TBaseDeptVO::getFdOrder))
                        .collect(Collectors.toList());
                tBaseDeptVO.setChildren(collect);
                tree.add(tBaseDeptVO);
            }
        }
        return tree;
    }

递归删除子节点

    public void deleteDept(TBaseDept tBaseDept)
    {
        String id = tBaseDept.getId();
        List<String> ids = queryChildNodes(id);
        tBaseDeptService.delete(ids);
    }

    /**
     * 递归查询所有子节点ID
     * @param id 父ID
     * @return ids
     */
    private List<String> queryChildNodes(String id)
    {
        List<String> ids = new ArrayList<>();
        // 查询数据库中所有与父节点关联的子节点
        TBaseDept dept = new TBaseDept();
        dept.setParentId(id);
        List<TBaseDept> childIds = tBaseDeptService.queryList(dept);
        // 递归删除子节点
        for (TBaseDept childId : childIds)
        {
            queryChildNodes(childId.getId());
            ids.add(childId.getId());
        }
        ids.add(id);
        return ids;
    }