如果搜尋結果內容太多，我們只想顯示前幾個字元， 必須與高亮一起使用

String keywords = "培訓";
        List<Article> articleList = new ArrayList<Article>();
        QueryParser queryParser = new QueryParser(LuceneUtil.getVersion(),"content",LuceneUtil.getAnalyzer());
        Query query = queryParser.parse(keywords);
        IndexSearcher indexSearcher 
 
= new IndexSearcher(LuceneUtil.getDirectory());
        TopDocs topDocs = indexSearcher.search(query,1000000);
        
        Formatter formatter = new SimpleHTMLFormatter("<font color='red'>","</font>");
        Scorer scorer = new QueryScorer(query);
        Highlighter highlighter = new
 
 Highlighter(formatter,scorer);
        
        Fragmenter fragmenter  = new SimpleFragmenter(4);
        highlighter.setTextFragmenter(fragmenter);
        
        for(int i=0;i<topDocs.scoreDocs.length;i++){
            ScoreDoc scoreDoc = topDocs.scoreDocs[i];
            int no = scoreDoc.doc;
            Document document 
 
= indexSearcher.doc(no);
            
            String highlighterContent = highlighter.getBestFragment(LuceneUtil.getAnalyzer(),"content",document.get("content"));
            document.getField("content").setValue(highlighterContent);
            
            Article article = (Article) LuceneUtil.document2javabean(document,Article.class);
            articleList.add(article);
        }
        for(Article article : articleList){
            System.out.println(article);
        }
    }