lucenc.net 全文检索 创建索引、 查询、分页

    #region 创建、跟新词库               /// <summary>               /// 创建、跟新词库               /// </summary>               private void CreateIndexData()               {                   //索引库文件夹                   FSDirectory dir = FSDirectory.Open(new DirectoryInfo(path), new NativeFSLockFactory());                   //是否存在索引库                   bool has = IndexReader.IndexExists(dir);                   if (has)                   {                       //解锁被锁定的索引库                       if (IndexWriter.IsLocked(dir))                       {                           IndexWriter.Unlock(dir);                       }                   }                   //索引库写对象                   IndexWriter iw = new IndexWriter(dir, new PanGuAnalyzer(), !has, IndexWriter.MaxFieldLength.UNLIMITED);                   List<LuceneModel> list = LuceneBll.Instance.Get();                   foreach (var o in list)                   {                       Document d = new Document();                       //Field.Store.YES:                         存储字段值（未分词前的字段值）                        //Field.Store.NO:                          不存储,存储与索引没有关系                        //Field.Store.COMPRESS:                    压缩存储,用于长文本或二进制，但性能受损                                //Field.Index ANALYZED;                    分词建索引                       //Field.Index ANALYZED_NO_NORMS;           分词压缩建索引                       //Field.Index NO;                       //Field.Index NOT_ANALYZED;                不分词建索引                       //Field.Index NOT_ANALYZED_NO_NORMS;       不分词压缩建索引                               //Field.TermVector NO;                                             //Field.TermVector WITH_OFFSETS;           存储偏移量                       //Field.TermVector WITH_POSITIONS;         存储位置                       //Field.TermVector WITH_POSITIONS_OFFSETS; 存储位置和偏移量                       //Field.TermVector YES;                    为每个文档（Document）存储该字段的TermVector                               d.Add(new Field("Id", o.Id.ToString(), Field.Store.YES, Field.Index.NOT_ANALYZED));                       d.Add(new Field("Title", o.Title, Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.WITH_POSITIONS_OFFSETS));                       d.Add(new Field("Message", o.Message, Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.WITH_POSITIONS_OFFSETS));                       iw.AddDocument(d);                   }                   iw.Optimize();                   //释放文件                   iw.Close();                   dir.Close();               }               #endregion  

    #region 查询                /// <summary>                /// 查询                /// </summary>                /// <param name="str">要查询的关键字</param>                /// <param name="index">页索引(从1开始)</param>                /// <param name="count">每页显示数据条数</param>                /// <returns></returns>                private List<LuceneModel> Search(string str, int index = 1, int count = 3)                {                    List<LuceneModel> list = null;                    //索引库文件夹                    FSDirectory dir = FSDirectory.Open(new DirectoryInfo(path), new NativeFSLockFactory());                    //是否存在索引库                    bool has = IndexReader.IndexExists(dir);                    //不存在则创建                    if (!has)                    {                        //创建索引库                        CreateIndexData();                    }                    //索引库读对象                    IndexReader ir = IndexReader.Open(dir, true);                    //索引库查询对象                    IndexSearcher searcher = new IndexSearcher(ir);                    //搜索条件                    PhraseQuery query = new PhraseQuery();                    //分词                    {                        Segment segment = new Segment();                        ICollection<WordInfo> words = segment.DoSegment(str);                        foreach (var o in words)                        {                            query.Add(new Term("Message", o.ToString()));                        }                    }                    //指定关键词相隔最大距离                    query.SetSlop(100);                    //盛放查询结果的容器                    TopScoreDocCollector collector = TopScoreDocCollector.create(index * count, false);                    //根据query查询条件进行查询                    searcher.Search(query, null, collector);                    ScoreDoc[] docs = collector.TopDocs(count * (index - 1), count * (index - 1) + count).scoreDocs;                    if (docs.Length > 0)                    {                        list = new List<LuceneModel>();                        foreach (var o in docs)                        {                            Document document = searcher.Doc(o.doc);                            LuceneModel m = new LuceneModel();                            m.Id = Convert.ToInt32(document.Get("Id"));                            m.Title = document.Get("Title");                            m.Message = document.Get("Message");                            list.Add(m);                        }                    }                    //释放文件                    ir.Close();                    searcher.Close();                    dir.Close();                    return list;                }                #endregion