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, 200);

                //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 = 50;

                for (int i = 0; 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, 200);