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lucene.net简单tutorial

2013-05-29 23:23 246 查看

Step1-CreateanewConsoleApplication

ThenextracttheLucene.Net.dllfromtheApache-Lucene.Net-2.9.2-incubating.bin.zipfileintoyourlibfolder.

You'llnoticelotsofotherbitsinthiszipfile.Especiallyofinteresttoyoulatermightbethestuffinthecontribfolder.Imightgettothatinalatertutorial,butfornowletskeepitsimple.

Step2-AddaReferencetotheLucene.net.dll

Yourreferencesshouldlooklikethis

Step3-CreateaDocument

OkthenextstepistocreateasimpleDocumentwiththeappropriatefieldswhichyou'llwanttosearchon.Inourcasewe'regoingtocreate3cars.aFordFiesta,aFordFocusandaVauxhallAstra.

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01	using System;

02	using System.IO;

03	using Lucene.Net.Analysis;

04	using Lucene.Net.Analysis.Standard;

05	using Lucene.Net.Documents;

06	using Lucene.Net.Index;

07	using Lucene.Net.Store;

08	using Directory=Lucene.Net.Store.Directory;

09	using Version=Lucene.Net.Util.Version;

11	namespace LuceneNet.App

13	class Program

15	static void Main( string []args)

17	varfordFiesta= new Document();

18	fordFiesta.Add( new Field( "Id" , "1" , Field.Store.YES,Field.Index.NOT_ANALYZED));

19	fordFiesta.Add( new Field( "Make" , "Ford" , Field.Store.YES,Field.Index.ANALYZED));

20	fordFiesta.Add( new Field( "Model" , "Fiesta" , Field.Store.YES,Field.Index.ANALYZED));

22	varfordFocus= new Document();

23	fordFocus.Add( new Field( "Id" , "2" , Field.Store.YES,Field.Index.NOT_ANALYZED));

24	fordFocus.Add( new Field( "Make" , "Ford" , Field.Store.YES,Field.Index.ANALYZED));

25	fordFocus.Add( new Field( "Model" , "Focus" , Field.Store.YES,Field.Index.ANALYZED));

27	varvauxhallAstra= new Document();

28	vauxhallAstra.Add( new Field( "Id" , "3" , Field.Store.YES,Field.Index.NOT_ANALYZED));

29	vauxhallAstra.Add( new Field( "Make" , "Vauxhall" , Field.Store.YES,Field.Index.ANALYZED));

30	vauxhallAstra.Add( new Field( "Model" , "Astra" , Field.Store.YES,Field.Index.ANALYZED));

34	Directorydirectory=FSDirectory.Open( new DirectoryInfo(Environment.CurrentDirectory+ "\\LuceneIndex" ));

35	Analyzeranalyzer= new StandardAnalyzer(Version.LUCENE_29);

38	varwriter= new IndexWriter(directory,analyzer, true ,IndexWriter.MaxFieldLength.LIMITED);

39	writer.AddDocument(fordFiesta);

40	writer.AddDocument(fordFocus);

41	writer.AddDocument(vauxhallAstra);

43	writer.Optimize();

44	writer.Close();

InthecodeaboveyoucanseewefirstlycreateaseriesofDocumenttypes.ForeachdocumentwethendefineaseriesofFields.YoumightthinkthislookssimilartoSQLwhereyoucreatethetableschemaandeachDocument
islikearowinthetable!There'sanimportantdifferencehere,documentsdonothaveaschema.Ifwe'dwantedtoIcouldofgiventhe2ForddocumentsanextrafieldcalledSpecialFordFieldwhichwouldn'thaveexistedatallontheVauxhall
documents.

Step4-CreateaDirectory

Nowweneedtosortoutwherewe'regoingtostoreourindex:

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1	Directorydirectory=FSDirectory.Open( new DirectoryInfo(Environment.CurrentDirectory+ "\\LuceneIndex" ));

TheabovecodecreatesaDirectory.thisistheplaceinwhichwestoreorwriteour
Indexto.InthiscaseweusetheFSDirectory.Open()
factorymethodtocreateanLuceneIndexontheFileSysteminafolder/directorycalledLuceneIndex.Wecouldofequallycreated
newRamDirectory()andjuststoredourindexinRAMforsuperhighperformancebutLuceneissofast,thatforthemostpartthisisunecessary.

Step5-TheAnalyzer

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1	Analyzeranalyzer= new StandardAnalyzer(Version.LUCENE_29);

WenextcreateanewAnalyzerwhichessentiallyturnsourtextintoTokenswhicharestoredinour
Index.

Step6-WritingtheDocumentstotheIndex

FinallyweactuallyhavetowritetheDocumentstoour
Index

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1	varwriter= new IndexWriter(directory,analyzer, true ,IndexWriter.MaxFieldLength.LIMITED);

2	writer.AddDocument(fordFiesta);

3	writer.AddDocument(fordFocus);

4	writer.AddDocument(vauxhallAstra);

6	writer.Optimize();

7	writer.Close();

WedefineanIndexWritertellingittouseourDirectoryandAnalyzerdefinedabove.WethenaddallthedocumentstotheIndexWritercallthe
writer.Optimize()whichessentallydoesthesemi-equivilentofadefragontheindexandthenfinallywriter.Close().Atthispointwehaveaperfectlygoodindextosearch.

Step7-OpeningtheIndexforSearching

Oknowlet'sactuallysearchournewlycreatedindex.

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1	IndexReaderindexReader=IndexReader.Open(directory, true );

2	SearcherindexSearch= new IndexSearcher(indexReader);

WefirstlyneedtoopenanIndexReaderherewe'repassingintheDirectorywecreatedaboveandwroteour
Documentsinto.AnIndexReadersimplyreadstheindexitdoesn'tdothemagicsearchpart.ForthatweneedaSearcherinourcasea
IndexSearcherwhichobviouslyneedstoreadourindexinternally.

Step8-CreatingourSearchQuery

Preparetosearchwithasimplesearchquery.Therealityisthatit'snotquiteassimpleastypinginaGooglequery,thoughit'snotfaroff.

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1	varqueryParser= new QueryParser(Version.LUCENE_29, "Make" ,analyzer);

2	varquery=queryParser.Parse( "Ford" );

Herewe'recreatingaQueryParserandspecifyingthatwewanttosearchthe
MakefieldofourIndex.ItistotallypossibletosearchmorethanonefieldbutforsimplicityI'mnotgoingtodothathere.WealsousethesameStandardAnalyzerweuseabovetoapplythesametokenizationtoourquery.

FinallyweparseourrawqueryFord.Sohopefullywe'llbeabletofindsomeFordcarsinourIndexspecificallyintheMakefield.

Step9-PerformingtheSearch

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1	Console.WriteLine( "Searchingfor:" +query.ToString());

2	TopDocsresultDocs=indexSearch.Search(query,indexReader.MaxDoc());

4	Console.WriteLine( "ResultsFound:" +resultDocs.totalHits);

AboveweperformoursearchandreturntheTopDocsthatmatch.Hopefullythisshouldbe2resultsifyoursisanythinglikemine.Thereareindeed2
Fordsinourindex.

Step10-DisplayingourSearchResults

Lastpart.wejustquicklyloopthroughandprintoutthecarsthatmatch.

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1	varhits=resultDocs.scoreDocs;

2	foreach (varhit in hits)

4	vardocumentFromSearcher=indexSearch.Doc(hit.doc);

5	Console.WriteLine(documentFromSearcher.Get( "Make" )+ "" +documentFromSearcher.Get( "Model" ));

8	indexSearch.Close();

9	directory.Close();

That'sit,goodluck,hopeyoufindwhatyou'relookingfor.

FullDownloadoftheLucene.Nettutorial

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