lucene.net 4.8 中文分词 高亮显示

使用 SmartChineseAnalyzer 分词

/// <summary>
        /// 返回高亮的文本块
        /// </summary>
        /// <param name="keywords">关键词</param>
        /// <returns></returns>
        static List<string> Search(string keywords)
        {
            List<string> results = new List<string>();
            try
            {
                IndexReader reader = DirectoryReader.Open(FSDirectory.Open("Index_Data"));
                var searcher = new IndexSearcher(reader);
                var keyWordQuery = new BooleanQuery();
                foreach (var item in GetKeyWords(keywords))
                {
                    keyWordQuery.Add(new TermQuery(new Term("title", item)), Occur.SHOULD);
                    keyWordQuery.Add(new TermQuery(new Term("keyword", item)), Occur.SHOULD);
                    keyWordQuery.Add(new TermQuery(new Term("description", item)), Occur.SHOULD);
                }
                var hits = searcher.Search(keyWordQuery, 16).ScoreDocs;//最多返回16条结果
                /* 语法高亮显示设置 */
                SmartChineseAnalyzer analyzer = new SmartChineseAnalyzer(LuceneVersion.LUCENE_48);
                Query query = new QueryBuilder(analyzer).CreateBooleanQuery("description", keywords, Occur.SHOULD);
                SimpleHTMLFormatter htmlFormatter = new SimpleHTMLFormatter("<span style='color:red'>", "</span>");
                Highlighter highlighter = new Highlighter(htmlFormatter,new QueryScorer(query));
                highlighter.TextFragmenter= new SimpleFragmenter(256);//显示给用户的含有关键词的文本块的大小

                foreach (var hit in hits)
                {
                    var document = searcher.Doc(hit.Doc);                
                    String descriptionText = document.Get("description");
                    TokenStream tokenStream = analyzer.GetTokenStream("description", new System.IO.StringReader(descriptionText));
                    System.String result = highlighter.GetBestFragments(tokenStream, descriptionText, 16, "...");
                    results.Add(result); 
                    //results.Add(document.Get("description"));
                }
                return results;
            }
            catch (Exception)
            {

                //throw;
                MessageBox.Show("使用前请初始化资料库");
                return results;
            }

        }