【第三节】Lucene5文档域加权

javazx

1、源码
' R9 d4 l" Z4 T% H" S) L2 Nimport java.nio.file.Paths;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
8 f2 h" C: B9 K2 _) e- n  M4 s5 Bimport 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;
. p' g1 d) W% w% j" ^import org.apache.lucene.index.IndexReader;
/ Q0 @; x3 N2 C/ rimport org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
* |& a0 |% k3 t/ p' _  s6 }import org.apache.lucene.index.Term;
: q, P, z3 p4 m* C6 Kimport org.apache.lucene.search.IndexSearcher;
- f, D: |: ?' |- U* Q7 O9 H4 timport org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TermQuery;
5 y0 ^1 _& O! A* ~; U$ Vimport org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
" L& L! P8 }2 Gimport org.apache.lucene.store.FSDirectory;
import org.junit.Test;
& D6 n% e. F: y! C# ~
! t4 l6 a0 G' `9 B  L3 Xpublic class IndexingTest2 {
6 w) Q, B7 e. V; K# n1 G
. O0 X6 u, [/ f( t+ q% v4 K    private String ids[]={"1","2","3","4"};
# @& `6 |, p' x+ k* E    private String authors[]={"Jack","Marry","John","Json"};
    private String positions[]={"accounting","technician","salesperson","boss"};
/ K7 R& |9 n* x* B$ O    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.",
, G! U! W! P8 P2 v2 F, F            "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,"
    };
+ i4 ^$ d/ S6 m  D3 Z
    private Directory dir;

    /**
# I3 E( n# V* M' G- ~     * 获取IndexWriter实例
; o% Q0 H5 f; u5 h     * @return
* p( O" T, p  q, i- A     * @throws Exception
2 s; u4 S' M6 e  O- Q     */
4 z, Y" G. j5 X' q    private IndexWriter getWriter()throws Exception{
" F3 P( p$ Q% s* U& }/ V        Analyzer analyzer=new StandardAnalyzer(); // 标准分词器
        IndexWriterConfig iwc=new IndexWriterConfig(analyzer);
        IndexWriter writer=new IndexWriter(dir, iwc);
0 h! G/ E$ t9 Q: `3 B$ t; o2 c        return writer;
' e) Q+ l$ E# T    }
; T: f9 G8 c. U( ~2 P6 H
    /**
     * 生成索引
, `8 {) R2 |/ R+ a! l% [. f2 y     * @throws Exception
* a, u$ \2 V3 G8 `- i# F" Z1 |     */
    @Test
    public void index()throws Exception{
        dir=FSDirectory.open(Paths.get("D:\\lucene3"));
& b, ]6 z4 t! m% A# A( u( v        IndexWriter writer=getWriter();
        for(int i=0;i<ids.length;i++){
) {# }: z2 ~7 p* ?: C4 x# e            Document doc=new Document();
2 ^; C4 \' c3 W" E0 g5 k8 y$ h            doc.add(new StringField("id", ids, Field.Store.YES));
            doc.add(new StringField("author",authors,Field.Store.YES));
- x: i& \& u6 y- Z- I$ b5 D            doc.add(new StringField("position",positions,Field.Store.YES));
8 Q: z5 ~" @5 K7 b& q4 i, L; R            // 加权操作
; s. q, P+ k, j* U" l: x, a            TextField field=new TextField("title", titles, Field.Store.YES);
            if("boss".equals(positions)){
                field.setBoost(1.5f);
6 _: j5 q' s; k% g" K) o            }
9 ]& h- t7 v/ T! o) `0 U5 o            doc.add(field);
' x* h( [& |& K            doc.add(new TextField("content", contents, Field.Store.NO));
* m0 i4 H" A% _+ c' A            writer.addDocument(doc); // 添加文档
3 ?! [: M+ }) u) g3 p  d        }
8 u  x+ x! n+ P* A( ^, M; a        writer.close();
    }
: @0 A+ k5 r" |3 s
    /**
     * 查询
( T& w  z; t1 ^/ l+ G+ L/ w     * @throws Exception
     */
    @Test
    public void search()throws Exception{
        dir=FSDirectory.open(Paths.get("D:\\lucene3"));
        IndexReader reader=DirectoryReader.open(dir);
, m% n( D" U9 y        IndexSearcher is=new IndexSearcher(reader);
5 ~% @! `2 i: O5 X" i- J        String searchField="title";
        String q="java";
$ j; n  |, W; v/ o2 f% W& h        Term t=new Term(searchField,q);
% W% D3 v/ s. s: I2 {, ^) y5 _' D        Query query=new TermQuery(t);
: {4 x5 b, T' ]8 Z, |8 }% m, ^        TopDocs hits=is.search(query, 10);
        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);
! z5 _& i' x. }' S) s* o+ b2 t            System.out.println(doc.get("author"));
( C  v1 O* y* K! s; R0 n; U% H        }
        reader.close();
$ ^" c! Q$ x) H3 H# Z    }

5 C% Y1 R# V3 e5 }8 C}
; I" S+ F+ z+ G6 K1 i
# }" l7 t$ I. R+ u8 d1 q7 g

% T5 C4 o; p3 [9 E

学java来尚学堂

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

java自学网给力 亲测资源可以