for迭代，不怎么常用，可以看看

List<ServiceEntity> seList=new ArrayList<ServiceEntity>();
		Set set=new HashSet();  //list去掉重复的spinfo
		List<ServiceEntity> seList2=new ArrayList<ServiceEntity>();
		
		for (SpServerServiceSplit spServerServiceSplit : serviceSplitList) {
			seList=channelService.serviceList(spServerServiceSplit.getPdid());
			for (ServiceEntity serviceEntity : seList) {
				set.add(serviceEntity);
			}
		}
		seList2.addAll(set);
		request.setAttribute("seList", seList2);

SpServerServiceSplit split = new SpServerServiceSplit();
		ServiceEntity serviceEntity = new ServiceEntity();
		for(int i=0;i<serviceSplitList.size();i++){
			split = serviceSplitList.get(i);
			seList=channelService.serviceList(split.getPdid());
			for(int j=0;j<seList.size();j++){
				serviceEntity = seList.get(j);
				set.add(serviceEntity);
			}
		}
两种不同的写法，第一种自己不常写

for (SpServerServiceSplit spServerServiceSplit : serviceSplitList) {}
和这样写是一样的：
SpServerServiceSplit spServerServiceSplit = new 
SpServerServiceSplit ();
for(int i=0;i<serviceSplitList.size();i++){
    spServerServiceSplit = serviceSplitList.get(i);
}