生成树结构数据

 /**.
     * 生成树
     * @param parentKey parentKey
     * @param equipmentTreeVos equipmentTreeVos
     * @return tree
     */
private  List<EquipmentTreeVo> getChild(String parentKey,
                                        List<EquipmentTreeVo>
                                                equipmentTreeVos) {
    List<EquipmentTreeVo> childrenList = new ArrayList<>();
    if (CollUtil.isNotEmpty(equipmentTreeVos)) {
        // 1.根据传入的父节点key,找到子节点
        for (EquipmentTreeVo vo : equipmentTreeVos) {
            if (Objects.equals(vo.getParentKey(), parentKey)) {
                childrenList.add(vo);
            }
        }
        // 2.找到子节点的节点
        for (EquipmentTreeVo node : childrenList) {
            // 3.递归找节点
            List<EquipmentTreeVo> child =
                    getChild(node.getKey(), equipmentTreeVos);
            List<EquipmentTreeVo> old = node.getChildren();
            old.addAll(child);
            node.setChildren(old);
        }
    }
    return childrenList;
}