【第三节】Lucene5文档域加权

javazx

1、源码
$ j8 ?2 j( S) |) P/ G2 x' oimport java.nio.file.Paths;
. I1 N2 j, y, {! |# q& x
( `! {8 \9 j( K- fimport org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
: R7 W* y% ^; Z+ n! F& w" p' S3 Gimport org.apache.lucene.document.Field;
5 u0 J& ~5 S, R7 y& S) B2 R) aimport org.apache.lucene.document.StringField;
" y$ U. q' X4 @3 l# Himport org.apache.lucene.document.TextField;
import org.apache.lucene.index.DirectoryReader;
3 u6 C3 |* n$ c% rimport org.apache.lucene.index.IndexReader;
- z% L6 o! U" c& Cimport org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.IndexSearcher;
4 I" D  L1 f" rimport org.apache.lucene.search.Query;
. c0 q) j! _: o7 r* x1 _import org.apache.lucene.search.ScoreDoc;
' Q- r' \# d1 |% w# g8 Simport org.apache.lucene.search.TermQuery;
4 q7 F7 u1 b+ G( |import org.apache.lucene.search.TopDocs;
# L, {# `  Q  e  pimport org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
" [3 L7 x# n. W9 P, Himport org.junit.Test;
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public class IndexingTest2 {
4 s5 K& m# @. L# @6 L1 ?
    private String ids[]={"1","2","3","4"};
% \% f% T, L0 K! Z3 r: P' I9 h    private String authors[]={"Jack","Marry","John","Json"};
' Y& a1 K7 J: ^4 @7 N) O( z* R    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"};
0 ]! J0 ?5 u2 W9 F" c8 F0 }    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. ",
& @: F2 B+ S1 ~( t' q, }/ g$ z            "Different JRE major versions may implement different versions of Unicode,",
) u  ^# n" u  h- o            "For example: with Java 1.4, `LetterTokenizer` will split around the character U+02C6,"
; K& @/ c& F; Q* p+ _    };

$ q/ [2 ]( v3 S: e, c+ s    private Directory dir;

( E, d/ d# o0 M5 a, Q. ^    /**
7 x2 w/ D" S; S/ u/ @     * 获取IndexWriter实例
     * @return
     * @throws Exception
     */
& u1 t; f2 k$ o' X    private IndexWriter getWriter()throws Exception{
. `9 `) r8 M% K8 @# Y- ?        Analyzer analyzer=new StandardAnalyzer(); // 标准分词器
        IndexWriterConfig iwc=new IndexWriterConfig(analyzer);
        IndexWriter writer=new IndexWriter(dir, iwc);
( ^5 M3 G9 c; y' A' w& @0 x        return writer;
; j1 }  d$ w/ W( L+ x1 g( h    }

    /**
     * 生成索引
8 U4 x- z1 U9 C. {5 z( d4 i, n     * @throws Exception
+ f+ E$ Z4 L9 T! F5 o     */
    @Test
    public void index()throws Exception{
        dir=FSDirectory.open(Paths.get("D:\\lucene3"));
7 L) F1 g8 @" t8 ^( h. D        IndexWriter writer=getWriter();
        for(int i=0;i<ids.length;i++){
/ _3 |3 g/ r5 u5 \+ h/ r            Document doc=new Document();
            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));
5 B" k, B6 X. j# {; T! l            // 加权操作
7 ?# B! U# a- L/ G( H3 h$ [            TextField field=new TextField("title", titles, Field.Store.YES);
            if("boss".equals(positions)){
0 j  L( H; y2 [, V* f                field.setBoost(1.5f);
( z" J; M  A9 G1 B/ |2 D            }
            doc.add(field);
            doc.add(new TextField("content", contents, Field.Store.NO));
            writer.addDocument(doc); // 添加文档
6 ~; O! |" C2 Z6 Z, z' d0 l        }
% i) G; w' C6 p        writer.close();
7 H5 ?4 _& [- N4 h+ ?6 `    }
+ D) A2 U7 E7 b2 g
: q, O! z5 ~2 S& [; ?- B+ @    /**
     * 查询
     * @throws Exception
     */
    @Test
    public void search()throws Exception{
, o$ R" A* D! `( k. Z1 ~" p        dir=FSDirectory.open(Paths.get("D:\\lucene3"));
: _5 }0 A7 R6 T8 Y& y        IndexReader reader=DirectoryReader.open(dir);
        IndexSearcher is=new IndexSearcher(reader);
, }* @5 P; ?% ]- z        String searchField="title";
        String q="java";
" D; e7 Y0 p" M        Term t=new Term(searchField,q);
2 C' H: J) F2 ^6 n( [        Query query=new TermQuery(t);
* J9 C& A1 H; J; d9 g        TopDocs hits=is.search(query, 10);
' R6 a# V4 U* b$ w- D: ]; y        System.out.println("匹配 '"+q+"'，总共查询到"+hits.totalHits+"个文档");
        for(ScoreDoc scoreDoc:hits.scoreDocs){
, M0 S0 t) u. X/ R. ~            Document doc=is.doc(scoreDoc.doc);
% ?) T5 J8 e& m/ C; S* f, }1 J            System.out.println(doc.get("author"));
        }
: c( C) D7 ^- G4 ~1 \0 i0 L' j        reader.close();
/ M7 \  G" A% p& N9 W, {    }
0 U& _: {6 Y; [; g' o+ J1 q
}
: |( m. v0 |8 O$ X1 t1 o) z; a% t

学java来尚学堂

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