代码片段，Lucene的高亮显示

代码高亮显示是通过在搜索到的Term中把匹配了用户输入的关键字的周围加上一些标记来实现（比如，关键字是 "中华" 查到的一个Term是 "中华人民共和国"，则把这个Term修改一下 把"中华" 两个字加粗，最终结果是这样的：  <b>中华</b>人民共和国 ）

下边是具体实现的代码片段：

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TopDocs tds = searcher.search(booleanQuery, 500);             ScoreDoc[] sds = tds.scoreDocs;             <strong>Formatter formatter = new SimpleHTMLFormatter("<span class=\"highlight\">", "</span>");</strong>             <strong>Highlighter hl = new Highlighter(formatter,new QueryScorer(booleanQuery));</strong>             for (ScoreDoc sd : sds) {                 Document doc = searcher.doc(sd.doc);                 //title的高亮显示                 TokenStream tokenScream_title = context.analyzer.tokenStream("title", new StringReader(doc.get("title")));                 String title = hl.getBestFragment(tokenScream_title, doc.get("title"));                 //若返回空表示doc.get("title")中不包含相应的关键字                 if(title==null){                     title=doc.get("title");                 } //              System.out.println("title"+title);                 //summary的高亮显示                 TokenStream tokenScream_summary = context.analyzer.tokenStream("summary", new StringReader(doc.get("summary")));                 String summary = hl.getBestFragment(tokenScream_summary, doc.get("summary"));                 if(summary==null){                     summary=doc.get("summary");                 } //              System.out.println("summary" + summary);