【第三节】Lucene5文档域加权

javazx

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;
. N, k6 ]4 Y" Q( ]1 y' u+ c0 yimport org.apache.lucene.document.TextField;
1 i+ ^3 ~6 U" k+ |# f! E6 kimport org.apache.lucene.index.DirectoryReader;
8 [; m% l+ m# q! i1 mimport 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;
0 ^! e7 N* ]( y' }; qimport org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
3 B" v9 |* d9 T! U2 w! j) Yimport org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.TopDocs;
' t, R( w# \* W9 E* i1 d% K: Aimport org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.junit.Test;
9 ~0 x+ z, c% b! x
" C4 R9 h$ d8 N- a7 B  V/ spublic class IndexingTest2 {
7 U4 ^# C( T  |7 U$ V
    private String ids[]={"1","2","3","4"};
    private String authors[]={"Jack","Marry","John","Json"};
- ~" |8 o- V4 ]+ ~    private String positions[]={"accounting","technician","salesperson","boss"};
5 S& {/ H' V% p5 s9 T2 R( v    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,"
: {9 ~: {( \% f4 `* V* V- y. V3 q    };
% D( T) ?3 `+ S6 T
    private Directory dir;
0 l( C, Q4 I' e0 k, K% ~
    /**
     * 获取IndexWriter实例
: E% m+ d( W: g. x& A- A     * @return
     * @throws Exception
     */
    private IndexWriter getWriter()throws Exception{
        Analyzer analyzer=new StandardAnalyzer(); // 标准分词器
) z; b; J0 Z; R& X) u        IndexWriterConfig iwc=new IndexWriterConfig(analyzer);
1 i- H. S* u& B' q) z        IndexWriter writer=new IndexWriter(dir, iwc);
0 E2 f* {! X2 Y- i# w8 \6 w! _        return writer;
7 J7 \- U: ]0 ^3 V6 J    }

    /**
% P3 M9 Y- _% e     * 生成索引
     * @throws Exception
! w! s6 j) t4 t3 k  ?     */
( j" y( D$ v0 [9 I    @Test
    public void index()throws Exception{
: [  e" ^: o& k1 e" L) ^5 J        dir=FSDirectory.open(Paths.get("D:\\lucene3"));
5 e# ^' b0 P  @6 J        IndexWriter writer=getWriter();
        for(int i=0;i<ids.length;i++){
            Document doc=new Document();
0 ^1 Q' i& ?3 |5 d. v2 V# L  q' l1 c            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
% [1 f( G6 d4 o8 F2 J( |            TextField field=new TextField("title", titles, Field.Store.YES);
            if("boss".equals(positions)){
                field.setBoost(1.5f);
0 e0 X1 U' v5 d0 n1 Y3 q* |) {            }
4 ~+ r- g0 f4 R$ K( u            doc.add(field);
# }& M: C; G" G, T            doc.add(new TextField("content", contents, Field.Store.NO));
            writer.addDocument(doc); // 添加文档
, D, d  J. G7 {  K) i& R+ x/ k- R        }
3 S: C& d/ R" ^        writer.close();
/ S% R2 U' @; N5 g1 s4 Y    }

    /**
     * 查询
     * @throws Exception
  Q) R- Z5 a+ J; @6 V     */
    @Test
    public void search()throws Exception{
0 S3 ~* t) K& ~, M" l- s        dir=FSDirectory.open(Paths.get("D:\\lucene3"));
        IndexReader reader=DirectoryReader.open(dir);
        IndexSearcher is=new IndexSearcher(reader);
( l$ [7 X- G/ k, W: X/ U        String searchField="title";
, u0 X, X5 i2 D+ j  p8 f! Y0 k  h/ o9 E        String q="java";
1 F4 L8 {$ d' A+ P( i% g" ?  \+ a( W. j8 O        Term t=new Term(searchField,q);
8 ~% i- @' O3 ^0 P+ H7 B        Query query=new TermQuery(t);
        TopDocs hits=is.search(query, 10);
        System.out.println("匹配 '"+q+"'，总共查询到"+hits.totalHits+"个文档");
5 Z/ h3 U8 R' o5 j0 s# w, t        for(ScoreDoc scoreDoc:hits.scoreDocs){
            Document doc=is.doc(scoreDoc.doc);
            System.out.println(doc.get("author"));
        }
& e3 w3 V: x0 A) h9 V" L- E        reader.close();
    }

}

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