【第三节】Lucene5文档域加权

javazx

1、源码
; a1 {, f6 G$ q; F: L+ K+ r' [import java.nio.file.Paths;
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" W* J" g4 K! G% b3 S" Vimport org.apache.lucene.analysis.Analyzer;
" M- o! a- l/ Z' }! h. v7 x6 A- G" ~import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
" g( ]) G2 {5 S; Y1 Gimport org.apache.lucene.document.StringField;
import org.apache.lucene.document.TextField;
& @+ u! U  _  B1 Himport org.apache.lucene.index.DirectoryReader;
9 z1 n9 s3 e; y! J# T6 aimport org.apache.lucene.index.IndexReader;
0 a/ [# h$ L0 e) V9 Y8 Iimport org.apache.lucene.index.IndexWriter;
' i) k3 e* j9 D/ G) w( mimport org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.IndexSearcher;
8 f6 X4 B2 {/ v: d4 i! a! L% Jimport org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.TopDocs;
) ^- x& T: f1 u4 Oimport org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.junit.Test;

0 O6 t  e: @, O1 zpublic class IndexingTest2 {
  d! [5 D0 O9 M$ Z' z7 F  }
    private String ids[]={"1","2","3","4"};
    private String authors[]={"Jack","Marry","John","Json"};
3 `: n$ ~5 C9 m" H; C0 v    private String positions[]={"accounting","technician","salesperson","boss"};
+ }; v1 B1 H$ P6 ^4 E- @    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,"
/ l! \. N0 p% ]& R    };

    private Directory dir;
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    /**
     * 获取IndexWriter实例
     * @return
     * @throws Exception
- X# X) W3 s# X+ c% @4 p$ w* ]" A     */
2 H# h# r0 z( T! x& S    private IndexWriter getWriter()throws Exception{
& ^' l& f1 M3 s% [- t' D        Analyzer analyzer=new StandardAnalyzer(); // 标准分词器
        IndexWriterConfig iwc=new IndexWriterConfig(analyzer);
        IndexWriter writer=new IndexWriter(dir, iwc);
        return writer;
    }
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    /**
: y3 z( w' X$ I  @1 I     * 生成索引
     * @throws Exception
% ~& h/ P: c' Z$ E     */
    @Test
3 x8 U% T! k1 p    public void index()throws Exception{
        dir=FSDirectory.open(Paths.get("D:\\lucene3"));
        IndexWriter writer=getWriter();
( p' M. ]% L' Q2 L% V* J6 d        for(int i=0;i<ids.length;i++){
$ L8 W  |. L; v: }% _& O' t$ o            Document doc=new Document();
9 L/ \$ v2 B! D/ M' \+ F            doc.add(new StringField("id", ids, Field.Store.YES));
            doc.add(new StringField("author",authors,Field.Store.YES));
            doc.add(new StringField("position",positions,Field.Store.YES));
            // 加权操作
            TextField field=new TextField("title", titles, Field.Store.YES);
            if("boss".equals(positions)){
                field.setBoost(1.5f);
1 L) j! u2 z7 Z. s' X& f            }
            doc.add(field);
$ Z6 b4 t, h$ A            doc.add(new TextField("content", contents, Field.Store.NO));
8 x- z( B2 q+ }# z6 S- V            writer.addDocument(doc); // 添加文档
        }
# I# g9 P5 }3 C' }% C        writer.close();
    }
7 ?4 ?! E# a+ t% u! F# m
    /**
     * 查询
, }  c: Z6 G) T% t7 X4 o3 l     * @throws Exception
     */
    @Test
    public void search()throws Exception{
! R+ C) w0 b  `" i2 o4 g" x        dir=FSDirectory.open(Paths.get("D:\\lucene3"));
2 |4 k) q1 l$ j5 B        IndexReader reader=DirectoryReader.open(dir);
3 ~. w$ F! R( l        IndexSearcher is=new IndexSearcher(reader);
        String searchField="title";
        String q="java";
  P2 c& N/ v2 [6 V" G; u% Z        Term t=new Term(searchField,q);
" g4 ^/ v( U0 Z; V9 y. q$ {' V6 Q        Query query=new TermQuery(t);
        TopDocs hits=is.search(query, 10);
; R9 y' v, H; v) }        System.out.println("匹配 '"+q+"'，总共查询到"+hits.totalHits+"个文档");
        for(ScoreDoc scoreDoc:hits.scoreDocs){
            Document doc=is.doc(scoreDoc.doc);
) p! K9 x3 L0 ~" V            System.out.println(doc.get("author"));
0 H" d9 u  C, ~$ k9 ]        }
        reader.close();
. X! |7 ^. I5 P5 T& B4 x    }

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