已知顶级节点idList获取所有子级节点的id

List childrenIdList = getIdList(topIdList,prodList,"prodId","superProdId");

List getIdList (List pidList,List mapList,String idName,String pidName){
		List idList = new ArrayList();
		for (Object o1 : pidList) {
			String pid = Convert.toStr(o1);
			for (Object o2 : mapList) {
				Map map = (Map) o2;
				if(map.get(pidName).equals(pid)){
					idList.add(map.get(idName));
				}
			}
		}
		if(idList.size()>0){
			List childrenIdList = getIdList(idList,mapList,idName,pidName);
			idList.addAll(childrenIdList);
		}
		return idList;
	}