【第三节】Lucene5文档域加权

javazx · 发表于 2016-6-20 14:49:36

1、源码
import java.nio.file.Paths;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.StringField;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
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.TermQuery;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.junit.Test;

public class IndexingTest2 {

private String ids[]={"1","2","3","4"};
private String authors[]={"Jack","Marry","John","Json"};
private String positions[]={"accounting","technician","salesperson","boss"};
private String titles[]={"Java is a good language.","Java is a cross platform language","Java powerful","You should learn java"};
private String contents[]={
         "If possible, use the same JRE major version at both index and search time.",
         "When upgrading to a different JRE major version, consider re-indexing. ",
         "Different JRE major versions may implement different versions of Unicode,",
         "For example: with Java 1.4, `LetterTokenizer` will split around the character U+02C6,"
};

private Directory dir;

/**
   * 获取IndexWriter实例
   * @return
   * @throws Exception
   */
private IndexWriter getWriter()throws Exception{
      Analyzer analyzer=new StandardAnalyzer(); // 标准分词器
      IndexWriterConfig iwc=new IndexWriterConfig(analyzer);
      IndexWriter writer=new IndexWriter(dir, iwc);
      return writer;
}

/**
   * 生成索引
   * @throws Exception
   */
@Test
public void index()throws Exception{
      dir=FSDirectory.open(Paths.get("D:\\lucene3"));
      IndexWriter writer=getWriter();
      for(int i=0;i<ids.length;i++){
         Document doc=new Document();
         doc.add(new StringField("id", ids, Field.Store.YES));& q+ p6 C$ G  `! w( u9 Q8 A( i* x
         doc.add(new StringField("author",authors,Field.Store.YES));
0 E: J6 M$ Y+ c" D          doc.add(new StringField("position",positions,Field.Store.YES));
/ X" Y% S+ @* X9 c  i+ T, \          // 加权操作
3 K: J5 U! Q  G          TextField field=new TextField("title", titles, Field.Store.YES);9 t8 s# A8 R+ f7 U0 x7 R+ f8 U
         if("boss".equals(positions)){2 p4 T/ s. ]/ w, M
            field.setBoost(1.5f);: @! K" j, r+ P
         }
3 t  `+ B7 X( p) W9 g* a) G8 L9 H          doc.add(field);
+ U8 }2 q- f/ H  l          doc.add(new TextField("content", contents, Field.Store.NO));9 ]9 n  Z8 `+ A3 H
         writer.addDocument(doc); // 添加文档
  L* ?0 J! ]; N+ D: Y5 a) r1 h+ ^3 A       }. N) S- ^4 G0 Y. h3 s) }- D
      writer.close();' K0 P* a( }+ p9 `4 T3 |. t: \
}4 J; s% o" }4 }$ B0 Q* \6 u
( z% L' C: Q1 x2 o" b' G
/**
5 x6 G& v- h4 I/ N7 ~    * 查询0 t9 ~2 ?% n+ E+ j1 N  M+ l6 x
   * @throws Exception
( i2 O: E1 x( h$ Y  V; @    */0 A6 d" w8 i& d- Z% ~' }8 H
@Test
! F" P4 a4 k: q7 z) g public void search()throws Exception{  Z) f$ J/ Q  d( D9 C9 J+ E
      dir=FSDirectory.open(Paths.get("D:\\lucene3"));5 I& }" ~- F. Z* f0 p0 |6 C
      IndexReader reader=DirectoryReader.open(dir);8 u  q, {, n1 X6 y3 G# d- G
      IndexSearcher is=new IndexSearcher(reader);
) E2 j- Z0 Q7 B& B       String searchField="title";# d' S# }. r$ D3 _) T
      String q="java";" E' }4 Y' z4 W+ J. l1 N' ~5 T
      Term t=new Term(searchField,q);
4 f  ^# }- }, X* o) }, U/ b* p       Query query=new TermQuery(t);3 a9 Y3 _( D3 p
      TopDocs hits=is.search(query, 10);
5 M+ u( a2 h$ Q$ o       System.out.println("匹配 '"+q+"'，总共查询到"+hits.totalHits+"个文档");
+ n4 u4 }' }! t. G: U. h       for(ScoreDoc scoreDoc:hits.scoreDocs){5 h1 P0 v1 R! d7 i0 Q: g) g9 N+ _3 p3 @
         Document doc=is.doc(scoreDoc.doc);& @) h, x4 z( g# C$ Z$ u) E
         System.out.println(doc.get("author"));( J9 Q4 Z- T* k% y- a, x- y
      }
: B. K7 L7 c0 C       reader.close();% M7 E5 \" I( \/ B. ]7 l, k0 |1 \- I
}3 `. E$ Z+ k, h1 y5 l

' m! ?2 i1 ^6 Y* X( P}
( W5 l5 t7 M4 `+ K* f3 L7 |: ]8 t
  ~, I! X6 O& J$ N2 V
- w6 b% G2 l! u5 g+ D& w& ~

学java来尚学堂 · 发表于 2016-10-29 14:14:51

看了那么多，还是觉得我参加的北京尚学堂的教的好。包教包会，而且毕业就有1W的工资在手。一起来学习吧

wwwfasss · 发表于 2016-10-30 12:24:00

java自学网给力亲测资源可以

		自动登录	找回密码
密码			立即注册

【第三节】Lucene5文档域加权

相关帖子

宣传达人

突出贡献

优秀版主

荣誉管理

论坛元老