lucene.net 2.9.2 实现索引生成，修改，查询，删除功

索引生成功能

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Web;
  4 using System.Web.UI;
  5 using System.Web.UI.WebControls;
  6 
  7 using StandardAnalyzer = Lucene.Net.Analysis.Standard.StandardAnalyzer;
  8 using IndexWriter = Lucene.Net.Index.IndexWriter;
  9 using FSDirectory = Lucene.Net.Store.FSDirectory;
 10 using Version = Lucene.Net.Util.Version;
 11  
 12 
 13 namespace Demo
 14 {
 15     public partial class _Default : System.Web.UI.Page
 16     {
 17         //生成索引文件的路径                                                
 18         private static readonly System.IO.FileInfo INDEX_DIR = new System.IO.FileInfo("D:\\ProjectsSVN\\ChinaValueApplication\\ChinaValueSearch\\Demo\\index");
 19 
 20         protected void Page_Load(object sender, EventArgs e)
 21         {
 22 
 23         }
 24 
 25         protected void CreateIndex_Click(object sender, EventArgs e)
 26         {
 27             //被索引文件的路径
 28             System.IO.FileInfo docDir = new System.IO.FileInfo("E:\\work\\back\\Document\\");
 29 
 30             Boolean tmpBool2;
 31 
 32             if (System.IO.File.Exists(docDir.FullName))
 33             {
 34                 tmpBool2 = true;
 35             }
 36             else
 37             {
 38                 tmpBool2 = System.IO.Directory.Exists(docDir.FullName);
 39             }
 40 
 41             if (!tmpBool2)
 42             {
 43                 ltrInfo.Text = "Document directory '" + docDir.FullName + "' does not exist or is not readable, please check the path";
 44                 return;
 45             }
 46 
 47             System.DateTime start = System.DateTime.Now;
 48 
 49             try
 50             {
 51                 Boolean EnableCreate = true;
 52 
 53                 if (System.IO.File.Exists("D:\\ProjectsSVN\\ChinaValueApplication\\ChinaValueSearch\\Demo\\index\\segments"))
 54                 {
 55                     EnableCreate = false;
 56                 }
 57 
 58                 IndexWriter writer = new IndexWriter(FSDirectory.Open(INDEX_DIR), new StandardAnalyzer(Version.LUCENE_CURRENT), EnableCreate, IndexWriter.MaxFieldLength.LIMITED);
 59                 ltrInfo.Text += "Indexing to directory '" + INDEX_DIR + "'... <br>";
 60                 IndexDocs(writer, docDir);
 61                 ltrInfo.Text += "Optimizing... <br>";
 62                 writer.Optimize();
 63                 writer.Close();
 64 
 65                 System.DateTime end = System.DateTime.Now;
 66                 ltrInfo.Text += "生成成功" + (end.Millisecond - start.Millisecond).ToString() + " total milliseconds <br>";
 67                 CreateIndex.Enabled = false;
 68             }
 69             catch (System.IO.IOException ex)
 70             {
 71                 ltrInfo.Text += " caught a " + ex.GetType() + "\n with message: " + ex.Message;
 72             }
 73         }
 74 
 75         private void IndexDocs(IndexWriter writer, System.IO.FileInfo file)
 76         {
 77             if (System.IO.Directory.Exists(file.FullName))
 78             {
 79                 System.String[] files = System.IO.Directory.GetFileSystemEntries(file.FullName);
 80 
 81                 if (files != null)
 82                 {
 83                     for (int i = 0; i < files.Length; i++)
 84                     {
 85                         IndexDocs(writer, new System.IO.FileInfo(files[i]));
 86                     }
 87                 }
 88             }
 89             else
 90             {
 91                 try
 92                 {
 93                     writer.AddDocument(FileDocument.Document(file));
 94                 }
 95                 catch (System.IO.FileNotFoundException fnfe)
 96                 {
 97                     ltrInfo.Text += "FileNotFoundException: " + fnfe.Message;
 98                 }
 99             }
100         }
101     }
102 }
103 

 

索引修改功能

 

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Web;
 4 using System.Web.UI;
 5 using System.Web.UI.WebControls;
 6 
 7 using IndexWriter = Lucene.Net.Index.IndexWriter;
 8 using FSDirectory = Lucene.Net.Store.FSDirectory;
 9 using StandardAnalyzer = Lucene.Net.Analysis.Standard.StandardAnalyzer;
10 using Version = Lucene.Net.Util.Version;
11 using Term = Lucene.Net.Index.Term;
12 
13 namespace Demo
14 {
15     public partial class UpdateIndex : System.Web.UI.Page
16     {
17         public String index = "D:\\ProjectsSVN\\ChinaValueApplication\\ChinaValueSearch\\Demo\\index";
18 
19         protected void Page_Load(object sender, EventArgs e)
20         {
21 
22         }
23 
24         protected void btnUpdate_Click(object sender, EventArgs e)
25         {
26             Boolean EnableCreate = true;
27 
28             if (System.IO.File.Exists(index + "\\segments.gen")) 
29             {
30                 EnableCreate= false;
31             }
32 
33             IndexWriter writer = new IndexWriter(FSDirectory.Open(new System.IO.FileInfo(index)), new StandardAnalyzer(Version.LUCENE_CURRENT), EnableCreate);
34 
35          //   System.IO.FileInfo file = new System.IO.FileInfo(txtID.Text.Trim().Replace("\\", "\\\\"));
36 
37             System.IO.FileInfo file = new System.IO.FileInfo(@"E:\work\back\Document\ksp.txt");
38             writer.UpdateDocument(new Term("path", txtID.Text.Trim()), FileDocument.Document(file));
39 
40             writer.Close();
41         }
42     }
43 }
44 

索引查询

 1 using System;
 2 
 3 using FSDirectory = Lucene.Net.Store.FSDirectory;
 4 using IndexReader = Lucene.Net.Index.IndexReader;
 5 using Searcher = Lucene.Net.Search.Searcher;
 6 using IndexSearcher = Lucene.Net.Search.IndexSearcher;
 7 using Analyzer = Lucene.Net.Analysis.Analyzer;
 8 using StandardAnalyzer = Lucene.Net.Analysis.Standard.StandardAnalyzer;
 9 using Version = Lucene.Net.Util.Version;
10 using QueryParser = Lucene.Net.QueryParsers.QueryParser;
11 using Query = Lucene.Net.Search.Query;
12 using TopScoreDocCollector = Lucene.Net.Search.TopScoreDocCollector;
13 using ScoreDoc = Lucene.Net.Search.ScoreDoc;
14 using Document = Lucene.Net.Documents.Document;
15 
16 namespace Demo
17 {
18     public partial class SearchIndex : System.Web.UI.Page
19     {
20         private static String index = "D:\\ProjectsSVN\\ChinaValueApplication\\ChinaValueSearch\\Demo\\index";
21 
22         protected void Page_Load(object sender, EventArgs e)
23         {
24 
25         }
26         protected void btnSearch_Click(object sender, EventArgs e)
27         {
28             String field = "contents";
29 
30             IndexReader reader = IndexReader.Open(FSDirectory.Open(new System.IO.FileInfo(index)), true);
31 
32             Searcher searcher = new IndexSearcher(reader);
33             Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_CURRENT);
34 
35             QueryParser parser = new QueryParser(field, analyzer);
36 
37             Query query = parser.Parse(txtKeyWord.Text.Trim());
38 
39             TopScoreDocCollector collector = TopScoreDocCollector.create(searcher.MaxDoc(), false);
40             searcher.Search(query, collector);
41             ScoreDoc[] hits = collector.TopDocs().scoreDocs;
42 
43             ltrResult.Text = "共 " + collector.GetTotalHits().ToString()+" 条记录<br>";
44 
45             for (Int32 i = 0; i < collector.GetTotalHits(); i++)
46             {
47                 ltrResult.Text += "doc=" + hits[i].doc + " score=" + hits[i].score + "<br>";
48                 Document doc = searcher.Doc(hits[i].doc);
49                 ltrResult.Text += "Path:" + doc.Get("path") + "<br>";
50             }
51 
52             reader.Close();
53         }
54     }
55 }

索引删除

 1 using System;
 2 
 3 using FSDirectory = Lucene.Net.Store.FSDirectory;
 4 using IndexReader = Lucene.Net.Index.IndexReader;
 5 using StandardAnalyzer = Lucene.Net.Analysis.Standard.StandardAnalyzer;
 6 using Version = Lucene.Net.Util.Version;
 7 using Directory = Lucene.Net.Store.Directory;
 8 using Term = Lucene.Net.Index.Term;
 9 using IndexWriter = Lucene.Net.Index.IndexWriter;
10 
11 namespace Demo
12 {
13     public partial class DelIndex : System.Web.UI.Page
14     {
15         private static String index = "D:\\ProjectsSVN\\ChinaValueApplication\\ChinaValueSearch\\Demo\\index";
16 
17         protected void Page_Load(object sender, EventArgs e)
18         {
19         }
20     
21         protected void btnDel_Click(object sender, EventArgs e)
22         {
23             try
24             {
25                 Directory directory = FSDirectory.Open(new System.IO.FileInfo(index));
26                 IndexReader reader = IndexReader.Open(directory, false);
27 
28                 //// 删除所有记录
29                 //for (int i = 0; i < reader.MaxDoc(); i++)
30                 //{
31                 //    reader.DeleteDocument(i);
32                 //}
33           
34                 if (rdlDel.SelectedValue == "1") //根据ID删除记录
35                 {
36                     Int32 i = Convert.ToInt32(txtID.Text);
37                     reader.DeleteDocument(i);
38                     ltrResult.Text = "删除成功";
39                 }
40                 else if (rdlDel.SelectedValue == "2") // 根据条件删除记录
41                 {
42                     Term term = new Term("path", txtID.Text.Trim());
43                     Int32 num = reader.DeleteDocuments(term);
44                     ltrResult.Text = "删除" + num.ToString() + "条记录成功";
45                 } 
46 
47                 reader.Close();
48                 directory.Close();
49 
50             }
51             catch (System.Exception ex)
52             {
53                 ltrResult.Text = " caught a " + e.GetType() + "\n with message: " + ex.Message;
54             }
55         }
56 
57         protected void btnOptimize_Click(object sender, EventArgs e)
58         {
59             IndexWriter writer = new IndexWriter(FSDirectory.Open(new System.IO.FileInfo(index)), new StandardAnalyzer(Version.LUCENE_CURRENT), false);
60             writer.Commit();
61             writer.Optimize();
62             writer.Close();
63         }
64     }

65 }

 

 http://www.newwhy.com/2010/0906/12585.html