Java的一种递归实现

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/**

 * 深度向下查询parentId
 * 
 * @param calltext  调用上下文，必填
 * @param parentId  父单元Id
 * @param parentIds 部门id集
 * @return 父部门下所有层级子部门id集合
 */
public List<Department> depthFindParentId(String parentId, List<Department> units) {
    List<Department> departments = _departmentSvc.findByParentId(parentId, null);
    if (departments!=null && departments.size() > 0) {
        for (Department dep : departments) {
            units.add(dep);
            depthFindParentId(dep.getId(), units);
        }
    }
    return units;
}

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