如何使用Lucene的中文分词搜索

来源：互联网   发布日期：2011-10-05 21:08:05   浏览：26101次  

以下文章主要介绍的是如何进行Lucene进行中文分词和全文搜索
package com.sf.module.extension.lucene; import java.io.File; import java.io.Serializable; import java.io.StringReader; import java.util.ArrayList; import java.util.Collection; import java.util.HashSet; import java.util.Iterator; import java.util.List; import java.util.Set; import org.apache.lucene.analysis.Analyzer; import org.apache.lucene.analysis.LimitTokenCountAnalyzer; import org.apache.lucene.analysis.TokenStream; import org.apache.lucene.document.Document; import org.apache.lucene.document.Field; import org.apache.lucene.index.IndexReader; import org.apache.lucene.index.IndexWriter; import org.apache.lucene.index.IndexWriterConfig; import org.apache.lucene.index.LogMergePolicy; import org.apache.lucene.index.Term; import org.apache.lucene.search.IndexSearcher; import org.apache.lucene.search.Query; import org.apache.lucene.search.ScoreDoc; import org.apache.lucene.search.TopDocs; import org.apache.lucene.store.Directory; import org.apache.lucene.store.FSDirectory; import org.apache.lucene.util.AttributeImpl; import org.apache.lucene.util.Version; import org.wltea.analyzer.IKSegmentation; import org.wltea.analyzer.Lexeme; import org.wltea.analyzer.dic.Dictionary; import org.wltea.analyzer.lucene.IKAnalyzer; import org.wltea.analyzer.lucene.IKQueryParser; import org.wltea.analyzer.lucene.IKSimilarity; public class LuceneUtils { public static boolean add(String indexPath, String lucenceKey, LuceneDB value) { Analyzer analyzer = new IKAnalyzer(); try { File file = new File(indexPath); Directory dir = FSDirectory.open(file); String lucene_pk = value.getDbtable() + "_" + value.getPk(); IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_31, analyzer); // delete exists index try { IndexReader reader = IndexReader.open(dir, false); Term pkTerm = new Term("lucene_pk", lucene_pk); reader.deleteDocuments(pkTerm); reader.close(); } catch (Exception e) { // fix file not exist } // create index IndexWriter writer = new IndexWriter(dir, config); writer.setMergeFactor(100); writer.setMaxBufferedDocs(100); Document doc = new Document(); Field content = new Field(lucenceKey, value.getConetnt(), Field.Store.YES, Field.Index.ANALYZED); doc.add(content); doc.add(new Field("pk", String.valueOf(value.getPk()), Field.Store.YES, Field.Index.NO)); doc.add(new Field("dbtable", String.valueOf(value.getDbtable()), Field.Store.YES, Field.Index.NO)); doc.add(new Field("lucene_pk", lucene_pk, Field.Store.YES, Field.Index.NOT_ANALYZED)); doc.setBoost(value.getOrderby()); writer.addDocument(doc); writer.close(); } catch (Exception e) { e.printStackTrace(); } return true; } public static Set<LuceneDB> search(String indexPath, String luceneKey, String word, int maxcount) { Set<LuceneDB> rst = new HashSet<LuceneDB>(); try { StringReader reader = new StringReader(word); File file = new File(indexPath); Directory dir = FSDirectory.open(file); IndexSearcher searcher = new IndexSearcher(dir); Query query = IKQueryParser.parse(luceneKey, word); TopDocs topDocs = searcher.search(query, maxcount); ScoreDoc[] scoreDocs = topDocs.scoreDocs; for (int i = 0; i < scoreDocs.length; i++) { ScoreDoc scoreDoc = scoreDocs[i]; Document targetDoc = searcher.doc(scoreDoc.doc); LuceneDB db = new LuceneDB(); db.fromDocument(targetDoc, luceneKey); /*System.out.println(db.getConetnt() + ":"); System.out.println(scoreDoc.score); System.out.println(searcher.explain(query, scoreDoc.doc)); System.out.println("----------------------");*/ rst.add(db); } } catch (Exception e) { e.printStackTrace(); } return rst; } public static void addIKAnalyzerWord(String... words){ Collection<String> datas = new HashSet<String>(); for(String word:words){ datas.add(word); } Dictionary.loadExtendWords(datas); } public static void main(String[] args) { addIKAnalyzerWord("咨","棕"); LuceneDB value = new LuceneDB(); value.setConetnt("你好，请问我的棕子咨询的价格是什么"); value.setPk(1L); value.setDbtable("records"); value.setOrderby(0.0f); LuceneDB userValue = new LuceneDB(); userValue.setConetnt("你好，请问我的棕的上来价格是咨什么"); userValue.setPk(2L); userValue.setDbtable("users"); userValue.setOrderby(0.0f); LuceneDB userValue2 = new LuceneDB(); userValue2.setConetnt("买棕了要买的上来的方式咨询"); userValue2.setPk(3L); userValue2.setDbtable("users"); userValue2.setOrderby(0.0f); LuceneUtils.add("d://index2", "lucene", value); LuceneUtils.add("d://index2", "lucene", userValue); LuceneUtils.add("d://index2", "lucene", userValue2); Set<LuceneDB> rst = LuceneUtils.search("d://index2", "lucene", "咨", 50); for (LuceneDB luceneDB : rst) { System.out.println("id:" + luceneDB.getPk() + "," + "table:" + luceneDB.getDbtable() + "," + luceneDB.getConetnt()); } System.out.println("-------------------------------------"); Set<LuceneDB> rst2 = LuceneUtils.search("d://index2", "lucene", "棕", 50); for (LuceneDB luceneDB : rst2) { System.out.println("id:" + luceneDB.getPk() + "," + "table:" + luceneDB.getDbtable() + "," + luceneDB.getConetnt()); } } }

package com.sf.module.extension.lucene; import java.io.Serializable; import org.apache.lucene.document.Document; public class LuceneDB { private Serializable pk; private String dbtable; private String conetnt; private float orderby; public float getOrderby() { return orderby; } public void setOrderby(float orderby) { this.orderby = orderby; } public Serializable getPk() { return pk; } public void setPk(Serializable pk) { this.pk = pk; } public String getConetnt() { return conetnt; } public void setConetnt(String conetnt) { this.conetnt = conetnt; } public String getDbtable() { return dbtable; } public void setDbtable(String dbtable) { this.dbtable = dbtable; } public LuceneDB fromDocument(Document doc,String luceneKey){ this.pk=doc.get("pk"); this.conetnt=doc.get(luceneKey); this.dbtable=doc.get("dbtable"); return this; } @Override public boolean equals(Object target) { LuceneDB obj=(LuceneDB)target; if(obj.getPk().equals(this.getPk()) && obj.getDbtable().equals(this.getDbtable())){ return true; } return false; } @Override public int hashCode() { return (this.getPk()+this.getDbtable()).hashCode(); } }

赞助本站