List结果按照某个对象属性分类

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//取各个批次中奖人列表
public Map<String,List<AniuAnnualMeetingRecord>> getAwardBatchList(){

    List<AniuAnnualMeetingRecord> list = aniuAnnualMeetingRecordMapper.getAwardBatchList();

    if(list == null || list.isEmpty()){
        return null;
    }
    TreeMap tm = new TreeMap();
    for(int i = 0; i < list.size(); i++){
        AniuAnnualMeetingRecord s = list.get(i);
        if(tm.containsKey(s.getBatchId())){
            ArrayList alist = (ArrayList)tm.get(s.getBatchId());
            alist.add(s);
        }else{
            ArrayList tem = new ArrayList();
            tem.add(s);
            tm.put(s.getBatchId(), tem);
        }
    }
    return tm;
}