Lucene 数字范围查询

public  List<Document> rangeSearch(){
         List<Document> docList = new ArrayList<Document>();
         Double start = 20.0;
         Double end = 40.0;
        NumericRangeQuery rangeQuery = NumericRangeQuery.newDoubleRange("carPrice",start,end,true, true);
        try {
            directory = FSDirectory.open(new File(LuceneConstant.INDEX_PATH));//打开索引文件夹 
            IndexReader reader = DirectoryReader.open(directory);//读取目录
            IndexSearcher search = new IndexSearcher(reader);//初始化查询组件
            TopDocs td = search.search(rangeQuery, 10000);//获取匹配上元素的一个docid  
            for (ScoreDoc doc : td.scoreDocs) {
                docList.add(search.doc(doc.doc));
            }
            reader.close();//关闭资源  
            directory.close();//关闭连接  
        } catch (IOException ex) {
            Logger.getLogger(LuceneDao.class.getName()).log(Level.SEVERE, null, ex);
        }
        return docList;
    }