Lucene.net 全文检索 盘古分词

lucene.net + 盘古分词

引用：

1.Lucene.Net.dll

2.PanGu.Lucene.Analyzer.dll

3.PanGu.HighLight.dll

4.PanGu.dll

 using Lucene.Net.Search;
 using Lucene.Net.Store;
 using Lucene.Net.QueryParsers;
 using Lucene.Net.Documents;
 using Lucene.Net.Index;
 using Lucene.Net.Analysis.Standard;
 using Lucene.Net.Analysis;
 using Lucene.Net.Analysis.PanGu;
 using PanGu.HighLight;
 using PanGu;

1.建立索引：

 static string path = @"G:\indextest";//索引文件储存位置

 static void CreateIndex()
         {
             //创建索引库目录
             var directory = FSDirectory.Open(new DirectoryInfo(path));
             Analyzer analyzer = null;
             //analyzer = new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_29);

             if (isPangu)
             {
                 analyzer = new PanGuAnalyzer();//盘古Analyzer
             }
             else
             {
                 analyzer = new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_29);
             }

             //创建一个索引,采用StandardAnalyzer对句子进行分词
             IndexWriter indexWriter = new IndexWriter(directory, analyzer, true, IndexWriter.MaxFieldLength.LIMITED);
             MySqlConnection conn = new MySqlConnection(@"server=localhost;User Id=root;password=123456;Database=ecshop");
             conn.Open();
             MySqlCommand cmd = new MySqlCommand("select goods_name,goods_brief from ecs_goods", conn);
             MySqlDataReader reader = cmd.ExecuteReader();
             while (reader.Read())
             {
                 //域的集合：文档，类似于表的行
                 Document doc = new Document();
                 //要索引的字段
                 doc.Add(new Field("goods_name", reader["goods_name"].ToString(), Field.Store.YES, Field.Index.ANALYZED));
                 doc.Add(new Field("goods_brief", reader["goods_brief"].ToString(), Field.Store.YES, Field.Index.ANALYZED));
                 indexWriter.AddDocument(doc);
             }
             reader.Close();
             //对索引文件进行优化
             indexWriter.Optimize();
             indexWriter.Close();
         }

2.搜索：

 　　　　 protected void Page_Load(object sender, EventArgs e)
         {
             keyword = Request.Form["q"];
             if (keyword != null && keyword != "")
             {
                 var watch = Stopwatch.StartNew();
                 Analyzer analyzer = null;
                 analyzer = new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_29);

                 //搜索
                 IndexSearcher searcher = new IndexSearcher(FSDirectory.Open(new DirectoryInfo(path)), true);

                 //查询表达式
                 QueryParser queryP = new QueryParser(Lucene.Net.Util.Version.LUCENE_29, "goods_name", analyzer);

                 //query.parse：注入查询条件
                 Query query = queryP.Parse(keyword);
                 var hits = searcher.Search(query, );

                 //create highlighter
                 //IFormatter formatter = new SimpleHTMLFormatter("<span style=\"font-weight:bold;color: red;\">", "</span>");
                 //SimpleFragmenter fragmenter = new SimpleFragmenter(80);
                 //var scorer = new QueryScorer(query);
                 //Highlighter highlighter = new Highlighter(formatter, scorer);
                 //highlighter.TextFragmenter = fragmenter;

                 //PanGu create highlighter
                 PanGu.HighLight.SimpleHTMLFormatter simpleHTMLFormatter =
                    new PanGu.HighLight.SimpleHTMLFormatter("<span style=\"font-weight:bold;color: red;\">", "</span>");
                 PanGu.HighLight.Highlighter highlighter =
                     new PanGu.HighLight.Highlighter(simpleHTMLFormatter,
                     new Segment());
                 highlighter.FragmentSize = ;

                 for (int i = ; i < hits.totalHits; i++)
                 {
                     Document doc = searcher.Doc(hits.scoreDocs[i].doc);
                     //TokenStream stream = analyzer.TokenStream("goods_name", new StringReader(doc.Get("goods_name")));
                     //String sample = highlighter.GetBestFragments(stream, doc.Get("goods_name"), 2, "...");
                     goods g = new goods();
                     g.goods_name = highlighter.GetBestFragment(keyword, doc.Get("goods_name"));
                     g.goods_brief = highlighter.GetBestFragment(keyword, doc.Get("goods_brief"));
                     gs.Add(g);
                 }

                 watch.Stop();

                 tasktime = "搜索耗费时间:" + watch.ElapsedMilliseconds + "毫秒";
             }
         }

多字段搜索

  string[] fields = { "Title", "Content" };
                 MultiFieldQueryParser mq = new MultiFieldQueryParser(Lucene.Net.Util.Version.LUCENE_29, fields, analyzer);
                 Query multiquery = mq.Parse(keyword);// MultiFieldQueryParser.Parse(Lucene.Net.Util.Version.LUCENE_29, new string[] { keyword }, fields, analyzer);
                 var hits1 = searcher.Search(multiquery, );