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service

    public List deptTree() {
        List deptList = sysDeptMapper.getAllDept();

        List dtoList = Lists.newArrayList();
        for (SysDept dept : deptList) {
            DeptLevelDto dto = DeptLevelDto.adapt(dept);
            dtoList.add(dto);
        }
        return deptListToTree(dtoList);
    }

    public List deptListToTree(List deptLevelList) {
        if (CollectionUtils.isEmpty(deptLevelList)) {
            return Lists.newArrayList();
        }
        // level -> [dept1, dept2, ...] Map>
        Multimap levelDeptMap = ArrayListMultimap.create();
        List rootList = Lists.newArrayList();

        for (DeptLevelDto dto : deptLevelList) {
            levelDeptMap.put(dto.getLevel(), dto);
            if (LevelUtil.ROOT.equals(dto.getLevel())) {