String defaultField = "title";
        String queryString ="test";
        Analyzer analyzer = new StandardAnalyzer();
        QueryParser parser = new QueryParser(defaultField,
                                            analyzer);  //用于解析查詢語法
        //從字符串得到查詢對象
        Query query = parser.parse(queryString);

        TopDocs hits = searcher.search(query, 10);
        System.out.println("hits.totalHits:"+ hits.totalHits);
        for (int j = 0; j < hits.scoreDocs.length; j++) {
            //根據文檔編號取出文檔對象
            Document hitDoc = searcher.doc(hits.scoreDocs[j].doc);
            System.out.println(hitDoc.get("title")); //輸出文檔
        }