lucene文本高亮

public static  String getHighLight(Document doc, Analyzer analyzer, Query query, String field) throws Exception
	{
		SimpleHTMLFormatter simpleHTMLFormatter = new SimpleHTMLFormatter("<b>", "</b>");
		/* 语法高亮显示设置 */
		Highlighter highlighter = new Highlighter(simpleHTMLFormatter, new QueryScorer(query));
		highlighter.setTextFragmenter(new SimpleFragmenter(100));
		// 取 field 字段值，准备进行高亮
		String fieldValue = doc.get(field);
		TokenStream tokenStream = analyzer.tokenStream(field, new StringReader(fieldValue));
		// 转成高亮的值
		String highLightFieldValue = highlighter.getBestFragment(tokenStream, fieldValue);
		if (highLightFieldValue == null)
			highLightFieldValue = fieldValue;
		return highLightFieldValue;
	}