easyUI中combotree从后台获取数据需要用到的递归

@Override
	public List<PowerVo> getPowerList() {
		//查询所有根节点
		List<PowerVo> parentPowerList = dao.getPowerListByParentid(0);
		
		getChildrenPowerList(parentPowerList);
		
		return parentPowerList;
	}

public void getChildrenPowerList(List<PowerVo> parentPowerList){
		for (PowerVo powerVo : parentPowerList) {
			Integer id = powerVo.getId();
			List<PowerVo> list = dao.getPowerListByParentid(id);
			if(list.size()>0){
				getChildrenPowerList(list);//再次调用自身
				powerVo.setChildren(list);
			}
		}
	}