一个递归

	public List<Integer>getSubtypeids(List <Integer> typeids,Integer[]parentids){
		if (parentids != null && parentids.length>0){
			StringBuffer jpql = new StringBuffer();
			for(int i=0;i<parentids.length;i++){
				jpql.append('?').append(i+1).append(',');
			}
			jpql.deleteCharAt(jpql.length()-1);
			Query query = em.createQuery("select o.typeid from ProductType o where o.parent.typeid in("+jpql.toString()+")");
			for(int i=0;i<parentids.length;i++){
				query.setParameter(i+1, parentids[i]);
			}
			typeids.addAll(query.getResultList());
			if(query.getResultList() != null && query.getResultList().size()>0){
				getSubtypeids(typeids,(Integer[]) query.getResultList().toArray(new Integer[0]));
			}	
		}
		return typeids;
	}