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segment search"ÄÜÕÒµ½¸ü¶àÏà¹ØµÄ×ÊÁÏ¡£

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×¢Ò⣺LuceneÖеÄһЩ±È½Ï¸´ÔӵĴʷ¨·ÖÎöÊÇÓÃJavaCCÉú³ÉµÄ£¨JavaCC£ºJava
Compiler
Compiler£¬´¿JAVAµÄ´Ê·¨·ÖÎöÉú³ÉÆ÷£©£¬ËùÒÔÈç¹û´ÓÔ´´úÂë±àÒë»òÐèÒªÐÞ¸ÄÆäÖеÄQueryParser¡¢¶¨ÖÆ×Ô¼ºµÄ´Ê·¨·ÖÎöÆ÷£¬»¹ÐèÒª´Óhttp://www.webgain.com/products/java_cc/ÏÂÔØjavacc¡£

luceneµÄ×é³É½á¹¹£º¶ÔÓÚÍⲿӦÓÃÀ´ËµË÷ÒýÄ£¿é(index)ºÍ¼ìË÷Ä£¿é(search)ÊÇÖ÷ÒªµÄÍⲿӦÓÃÈë¿Ú

org.apache.Lucene.search/ ËÑË÷Èë¿Ú
org.apache.Lucene.index/ Ë÷ÒýÈë¿Ú
org.apache.Lucene.analysis/ ÓïÑÔ·ÖÎöÆ÷
org.apache.Lucene.queryParser/ ²éѯ·ÖÎöÆ÷
org.apache.Lucene.document/ ´æ´¢½á¹¹
org.apache.Lucene.store/ µ×²ãIO/´æ´¢½á¹¹
org.apache.Lucene.util/ һЩ¹«ÓõÄÊý¾Ý½á¹¹

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Ë÷Òý¹ý³Ì£º´ÓÃüÁîÐжÁÈ¡ÎļþÃû£¨¶à¸ö£©£¬½«Îļþ·Ö·¾¶(path×Ö¶Î)ºÍÄÚÈÝ(body×Ö¶Î)2¸ö×ֶνøÐд洢£¬²¢¶ÔÄÚÈݽøÐÐÈ«ÎÄË÷Òý£ºË÷ÒýµÄµ¥Î»ÊÇDocument¶ÔÏó£¬Ã¿¸öDocument¶ÔÏó°üº¬¶à¸ö×Ö¶ÎField¶ÔÏó£¬Õë¶Ô²»Í¬µÄ×Ö¶ÎÊôÐÔºÍÊý¾ÝÊä³öµÄÐèÇ󣬶Ô×ֶλ¹¿ÉÒÔÑ¡Ôñ²»Í¬µÄË÷Òý/´æ´¢×ֶιæÔò£¬ÁбíÈçÏ£º
·½·¨ ÇÐ´Ê Ë÷Òý ´æ´¢ ÓÃ;
Field.Text(String name, String value) Yes Yes Yes
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Field.Text(String name, Reader value) Yes Yes No
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Field.Keyword(String name, String value) No Yes Yes
²»ÇзÖË÷Òý²¢´æ´¢£¬±ÈÈ磺ÈÕÆÚ×Ö¶Î
Field.UnIndexed(String name, String value) No No Yes
²»Ë÷Òý£¬Ö»´æ´¢£¬±ÈÈ磺Îļþ·¾¶
Field.UnStored(String name, String value) Yes Yes No
ֻȫÎÄË÷Òý£¬²»´æ´¢

public class IndexFiles {
//ʹÓ÷½·¨£º: IndexFiles [Ë÷ÒýÊä³öĿ¼]
[Ë÷ÒýµÄÎļþÁбí] ...
public static void main(String[] args) throws
Exception {
String indexPath = args[0];
IndexWriter writer;

//ÓÃÖ¸¶¨µÄÓïÑÔ·ÖÎöÆ÷¹¹ÔìÒ»¸öеÄдË÷ÒýÆ÷£¨µÚ3¸ö²ÎÊý±íʾÊÇ·ñΪ׷¼ÓË÷Òý£©
writer = new IndexWriter(indexPath, new
SimpleAnalyzer(), false);

for (int i=1; i<args.length; i++) {
System.out.println("Indexing file " + args[i]);
InputStream is = new FileInputStream(args[i]);

//¹¹Ôì°üº¬2¸ö×Ö¶ÎFieldµÄDocument¶ÔÏó
//Ò»¸öÊÇ·¾¶path×ֶΣ¬²»Ë÷Òý£¬Ö»´æ´¢
//Ò»¸öÊÇÄÚÈÝbody×ֶΣ¬½øÐÐÈ«ÎÄË÷Òý£¬²¢´æ´¢
Document doc = new Document();
doc.add(Field.UnIndexed("path", args[i]));
doc.add(Field.Text("body", (Reader) new
InputStreamReader(is)));
//½«ÎĵµÐ´ÈëË÷Òý
writer.addDocument(doc);
is.close();
};
//¹Ø±ÕдË÷ÒýÆ÷
writer.close();
}
}
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ÓïÑÔ·ÖÎöÆ÷ÌṩÁ˳éÏóµÄ½Ó¿Ú£¬Òò´ËÓïÑÔ·ÖÎö(Analyser)ÊÇ¿ÉÒÔ¶¨ÖƵģ¬ËäÈ»luceneȱʡÌṩÁË2¸ö±È½ÏͨÓõķÖÎöÆ÷SimpleAnalyserºÍStandardAnalyser£¬Õâ2¸ö·ÖÎöÆ÷ȱʡ¶¼²»Ö§³ÖÖÐÎÄ£¬ËùÒÔÒª¼ÓÈë¶ÔÖÐÎÄÓïÑÔµÄÇзֹæÔò£¬ÐèÒªÐÞ¸ÄÕâ2¸ö·ÖÎöÆ÷¡£

Lucene²¢Ã»Óй涨Êý¾ÝÔ´µÄ¸ñʽ£¬¶øÖ»ÌṩÁËÒ»¸öͨÓõĽṹ£¨Document¶ÔÏó£©À´½ÓÊÜË÷ÒýµÄÊäÈ룬Òò´ËÊäÈëµÄÊý¾ÝÔ´¿ÉÒÔÊÇ£ºÊý¾Ý¿â£¬WORDÎĵµ£¬PDFÎĵµ£¬HTMLÎĵµ¡­¡­Ö»ÒªÄܹ»Éè¼ÆÏàÓ¦µÄ½âÎöת»»Æ÷½«Êý¾ÝÔ´¹¹Ôì³É³ÉDocuement¶ÔÏ󼴿ɽøÐÐË÷Òý¡£

¶ÔÓÚ´óÅúÁ¿µÄÊý¾ÝË÷Òý£¬»¹¿ÉÒÔͨ¹ýµ÷ÕûIndexerWriteµÄÎļþºÏ²¢ÆµÂÊÊôÐÔ£¨mergeFactor£©À´Ìá¸ßÅúÁ¿Ë÷ÒýµÄЧÂÊ¡£

¼ìË÷¹ý³ÌºÍ½á¹ûÏÔʾ£º

ËÑË÷½á¹û·µ»ØµÄÊÇHits¶ÔÏ󣬿ÉÒÔͨ¹ýËüÔÙ·ÃÎÊDocument==>FieldÖеÄÄÚÈÝ¡£

¼ÙÉè¸ù¾Ýbody×ֶνøÐÐÈ«ÎļìË÷£¬¿ÉÒÔ½«²éѯ½á¹ûµÄpath×ֶκÍÏàÓ¦²éѯµÄÆ¥Åä¶È(score)´òÓ¡³öÀ´£¬

public class Search {
public static void main(String[] args) throws
Exception {
String indexPath = args[0], queryString = args[1];
//Ö¸ÏòË÷ÒýĿ¼µÄËÑË÷Æ÷
Searcher searcher = new IndexSearcher(indexPath);
//²éѯ½âÎöÆ÷£ºÊ¹ÓúÍË÷ÒýͬÑùµÄÓïÑÔ·ÖÎöÆ÷
Query query = QueryParser.parse(queryString,
"body",
new SimpleAnalyzer());
//ËÑË÷½á¹ûʹÓÃHits´æ´¢
Hits hits = searcher.search(query);
//ͨ¹ýhits¿ÉÒÔ·ÃÎʵ½ÏàÓ¦×ֶεÄÊý¾ÝºÍ²éѯµÄÆ¥Åä¶È
for (int i=0; i<hits.length(); i++) {
System.out.println(hits.doc(i).get("path") + ";
Score: " +
hits.score(i));
};
}
}
ÔÚÕû¸ö¼ìË÷¹ý³ÌÖУ¬ÓïÑÔ·ÖÎöÆ÷£¬²éѯ·ÖÎöÆ÷£¬ÉõÖÁËÑË÷Æ÷£¨Searcher£©¶¼ÊÇÌṩÁ˳éÏóµÄ½Ó¿Ú£¬¿ÉÒÔ¸ù¾ÝÐèÒª½øÐж¨ÖÆ¡£
Hacking Lucene

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Query ::= ( Clause )*
Clause ::= ["+", "-"] [<TERM> ":"] ( <TERM> | "("
Query ")" )

ÖмäµÄÂß¼­°üÀ¨£ºand or + - &&
||µÈ·ûºÅ£¬¶øÇÒ»¹ÓÐ"¶ÌÓï²éѯ"ºÍÕë¶ÔÎ÷ÎĵÄǰ׺/Ä£ºý²éѯµÈ£¬¸öÈ˸оõ¶ÔÓÚÒ»°ãÓ¦ÓÃÀ´Ëµ£¬ÕâЩ¹¦ÄÜÓÐһЩ»ª¶ø²»Êµ£¬ÆäʵÄܹ»ÊµÏÖÄ¿Ç°ÀàËÆÓÚGOOGLEµÄ²éѯÓï¾ä·ÖÎö¹¦ÄÜÆäʵ¶ÔÓÚ´ó¶àÊýÓû§À´ËµÒѾ­¹»ÁË¡£ËùÒÔ£¬LuceneÔçÆÚ°æ±¾µÄQueryParserÈÔÊDZȽϺõÄÑ¡Ôñ¡£

Ìí¼ÓÐÞ¸Äɾ³ýÖ¸¶¨¼Ç¼£¨Document£©

LuceneÌṩÁËË÷ÒýµÄÀ©Õ¹»úÖÆ£¬Òò´ËË÷ÒýµÄ¶¯Ì¬À©Õ¹Ó¦¸ÃÊÇûÓÐÎÊÌâµÄ£¬¶øÖ¸¶¨¼Ç¼µÄÐÞ¸ÄÒ²ËƺõÖ»ÄÜͨ¹ý¼Ç¼µÄɾ³ý£¬È»ºóÖØмÓÈëʵÏÖ¡£ÈçºÎɾ³ýÖ¸¶¨µÄ¼Ç¼ÄØ£¿É¾³ýµÄ·½·¨Ò²ºÜ¼òµ¥£¬Ö»ÊÇÐèÒªÔÚË÷Òýʱ¸ù¾ÝÊý¾ÝÔ´ÖеļǼIDרÃÅÁí½¨Ë÷Òý£¬È»ºóÀûÓÃIndexReader.delete(Term
term)·½·¨Í¨¹ýÕâ¸ö¼Ç¼IDɾ³ýÏàÓ¦µÄDocument¡£

¸ù¾Ýij¸ö×Ö¶ÎÖµµÄÅÅÐò¹¦ÄÜ

luceneȱʡÊÇ°´ÕÕ×Ô¼ºµÄÏà¹Ø¶ÈËã·¨£¨score£©½øÐнá¹ûÅÅÐòµÄ£¬µ«Äܹ»¸ù¾ÝÆäËû×ֶνøÐнá¹ûÅÅÐòÊÇÒ»¸öÔÚLUCENEµÄ¿ª·¢ÓʼþÁбíÖо­³£Ìáµ½µÄÎÊÌ⣬ºÜ¶àÔ­ÏÈ»ùÓÚÊý¾Ý¿âÓ¦Óö¼ÐèÒª³ýÁË»ùÓÚÆ¥Åä¶È£¨score£©ÒÔÍâµÄÅÅÐò¹¦ÄÜ¡£¶ø´ÓÈ«ÎļìË÷µÄÔ­ÀíÎÒÃÇ¿ÉÒÔÁ˽⵽£¬Èκβ»»ùÓÚË÷ÒýµÄËÑË÷¹ý³ÌЧÂʶ¼»áµ¼ÖÂЧÂʷdz£µÄµÍ£¬Èç¹û»ùÓÚÆäËû×ֶεÄÅÅÐòÐèÒªÔÚËÑË÷¹ý³ÌÖзÃÎÊ´æ´¢×ֶΣ¬ËٶȻشó´ó½µµÍ£¬Òò´Ë·Ç³£ÊDz»¿ÉÈ¡µÄ¡£

µ«ÕâÀïÒ²ÓÐÒ»¸öÕÛÖеĽâ¾ö·½·¨£ºÔÚËÑË÷¹ý³ÌÖÐÄܹ»Ó°ÏìÅÅÐò½á¹ûµÄÖ»ÓÐË÷ÒýÖÐÒѾ­´æ´¢µÄdocIDºÍscoreÕâ2¸ö²ÎÊý£¬ËùÒÔ£¬»ùÓÚscoreÒÔÍâµÄÅÅÐò£¬Æäʵ¿ÉÒÔͨ¹ý½«Êý¾ÝÔ´Ô¤ÏÈÅźÃÐò£¬È»ºó¸ù¾ÝdocID½øÐÐÅÅÐòÀ´ÊµÏÖ¡£ÕâÑù¾Í±ÜÃâÁËÔÚLUCENEËÑË÷½á¹ûÍâ¶Ô½á¹ûÔٴνøÐÐÅÅÐòºÍÔÚËÑË÷¹ý³ÌÖзÃÎʲ»ÔÚË÷ÒýÖеÄij¸ö×Ö¶ÎÖµ¡£

ÕâÀïÐèÒªÐ޸ĵÄÊÇIndexSearcherÖеÄHitCollector¹ý³Ì£º

...
¡¡scorer.score(new HitCollector() {
private float minScore = 0.0f;
public final void collect(int doc, float score) {
if (score > 0.0f && // ignore zeroed buckets
(bits==null || bits.get(doc))) { // skip docs
not in bits
totalHits[0]++;
if (score >= minScore) {
/*
Ô­ÏÈ£ºLucene½«docIDºÍÏàÓ¦µÄÆ¥Åä¶ÈscoreÀýÈë½á¹ûÃüÖÐÁбíÖУº
* hq.put(new ScoreDoc(doc, score)); //
update hit queue
* Èç¹ûÓÃdoc »ò 1/doc ´úÌæ
score£¬¾ÍʵÏÖÁ˸ù¾ÝdocID˳ÅÅ»òÄæÅÅ
*
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*
Õë¶Ôij¸ö×ֶεÄÅÅÐò£¬ÉõÖÁ¿ÉÒÔʵÏÖ¸ü¸´ÔÓµÄscoreºÍdocIDµÄÄâºÏ¡£
*/
hq.put(new ScoreDoc(doc, (float) 1/doc
));
if (hq.size() > nDocs) { // if hit queue
overfull
hq.pop(); // remove lowest in hit queue
minScore = ((ScoreDoc)hq.top()).score; // reset
minScore
}
}
}
}
}, reader.maxDoc());
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Êý¾ÝÔ´: WORD PDF HTML
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¼òµ¥µÄÓ¦ÓÃÈë¿ÚSearcher,
Indexer£¬²¢µ÷ÓõײãһϵÁÐ×é¼þЭͬµÄÍê³ÉËÑË÷ÈÎÎñ£»
ËùÓеĶÔÏóµÄÈÎÎñ¶¼·Ç³£×¨Ò»£º±ÈÈçËÑË÷¹ý³Ì£ºQueryParser·ÖÎö½«²éѯÓï¾äת»»³ÉһϵÁеľ«È·²éѯµÄ×éºÏ(Query),
ͨ¹ýµ×²ãµÄË÷Òý¶ÁÈ¡½á¹¹IndexReader½øÐÐË÷ÒýµÄ¶ÁÈ¡£¬²¢ÓÃÏàÓ¦µÄ´ò·ÖÆ÷¸øËÑË÷½á¹û½øÐдò·Ö/ÅÅÐòµÈ¡£×îºóÖ»½«×îÇ°ÃæµÄÍ·100Ìõ½á¹û·Åµ½½á¹û¼¯»º´æÖУ¬ÖªµÀÓÐÐèÒª¶ÁÈ¡¸üºóÃæµÄ½á¹ûʱ¡£ÓÉÓÚËùÓеŦÄÜÄ£¿éÔ­×Ó»¯³Ì¶È·Ç³£¸ß£¬Òò´Ë¿ÉÒÔͨ¹ýÖØÐÂʵÏÖ¶ø²»ÐèÒªÐÞ¸ÄÆäËû³ÌÐò¡£

³ýÁËÁé»îµÄÓ¦ÓýӿÚÉè¼Æ£¬Lucene»¹ÌṩÁËһЩÊʺϴó¶àÊýÓ¦ÓõÄÓïÑÔ·ÖÎöÆ÷ʵÏÖ£¨SimpleAnalyser,
StandardAnalyser£©£¬ÕâÒ²ÊÇÐÂÓû§Äܹ»ºÜ¿ìÉÏÊÖµÄÖØÒªÔ­ÒòÖ®Ò»¡£

ÕâЩÓŵ㶼ÊǷdz£ÖµµÃÔÚÒÔºóµÄ¿ª·¢ÖÐѧϰ½è¼øµÄ¡£×÷Ϊһ¸öͨÓù¤¾ß¿â£¬LuneceµÄÈ·¸øÓèÁËÐèÒª½«È«ÎļìË÷¹¦ÄÜǶÈëµ½Ó¦ÓÃÖеĿª·¢ÕߺܶàµÄ±ãÀû¡£

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Apache: Lucene Project
http://jakarta.apache.org/Lucene/
LuceneÓʼþÁбí¹éµµ
Lucene-dev@jakarta.apache.org
Lucene-user@jakarta.apache.org

The Lucene search engine: Powerful, flexible, and free
http://www.javaworld.com/javaworld/jw-09-2000/jw-0915-Lucene_p.html

ÖÐÎÄÓïÑÔµÄÇзִÊ

Lucene Tutorial
http://www.darksleep.com/puff/lucene/lucene.html

Notes on distributed searching with Lucene
http://home.clara.net/markharwood/lucene/

ËÑË÷ÒýÇ湤¾ß½éÉÜ
http://searchtools.com/

ËÑË÷ÒýÇæÐÐÒµÑо¿
http://www.searchenginewatch.com/

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