Lucene 3.6.2入门(8) 高级搜索之自定义评分

package com.jadyer.lucene;  

import java.io.File;
import java.io.IOException;
import java.util.Random;  

import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.NumericField;
import org.apache.lucene.index.CorruptIndexException;
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.apache.lucene.util.Version;  

import com.jadyer.custom.MyNameScoreQuery;  

/**
 * 【Lucene3.6.2入门系列】第08节_高级搜索之自定义评分
 * @create Aug 19, 2013 12:13:14 PM
 * @author 玄玉<http://blog.csdn.net/jadyer>
 */
public class AdvancedSearchByScore {
    private Directory directory;
    private IndexReader reader;  

    public AdvancedSearchByScore(){
        /**文件大小*/
        int[] sizes = {90, 10, 20, 10, 60, 50};
        /**文件名*/
        String[] names = {"Michael.java", "Scofield.ini", "Tbag.txt", "Jack", "Jade", "Jadyer"}; 

        /**文件内容*/
        String[] contents = {"my java blog is http://blog.csdn.net/jadyer",
                             "my Java Website is http://www.jadyer.cn",
                             "my name is jadyer",
                             "I am a Java Developer",
                             "I am from Haerbin",
                             "I like java of Lucene"};
        IndexWriter writer = null;
        Document doc = null;
        try {
            directory = FSDirectory.open(new File("myExample/01_index/"));
            writer = new IndexWriter(directory, new IndexWriterConfig(Version.LUCENE_36, new 

StandardAnalyzer(Version.LUCENE_36)));
            writer.deleteAll();
            for(int i=0; i<sizes.length; i++){
                doc = new Document();
                doc.add(new NumericField("size", Field.Store.YES, true).setIntValue(sizes[i]));
                doc.add(new Field("name", names[i], Field.Store.YES, 

Field.Index.ANALYZED_NO_NORMS));
                doc.add(new Field("content", contents[i], Field.Store.NO, 

Field.Index.ANALYZED));
                //添加一个评分域,专门在自定义评分时使用
                //此时默认为Field.Store.NO和Field.Index.ANALYZED_NO_NORMS
                doc.add(new NumericField("fileScore").setIntValue(new Random().nextInt(600)));
                writer.addDocument(doc);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if(null != writer){
                try {
                    writer.close();
                } catch (IOException ce) {
                    ce.printStackTrace();
                }
            }
        }
    }  

    /**
     * 获取IndexReader实例
     */
    private IndexReader getIndexReader(){
        try {
            if(reader == null){
                reader = IndexReader.open(directory);
            }else{
                //if the index was changed since the provided reader was opened, open and return 

a new reader; else,return null
                //如果当前reader在打开期间index发生改变,则打开并返回一个新的IndexReader,否则返回

null
                IndexReader ir = IndexReader.openIfChanged(reader);
                if(ir != null){
                    reader.close(); //关闭原reader
                    reader = ir;    //赋予新reader
                }
            }
            return reader;
        }catch(Exception e) {
            e.printStackTrace();
        }
        return null; //发生异常则返回null
    }  

    /**
     * 自定义评分搜索
     */
    public void searchByCustomScoreQuery(){
        IndexSearcher searcher = new IndexSearcher(this.getIndexReader());
//      //创建一个评分域
//      FieldScoreQuery fsq = new FieldScoreQuery("fileScore", FieldScoreQuery.Type.INT);
//      //创建自定义的CustomScoreQuery对象
//      Query query = new MyCustomScoreQuery(new TermQuery(new Term("content", "java")), fsq);
        Query query = new MyNameScoreQuery(new TermQuery(new Term("content", "java")));
        try {
            TopDocs tds = searcher.search(query, 10);
            for(ScoreDoc sd : tds.scoreDocs){
                Document doc = searcher.doc(sd.doc);
                System.out.print("文档编号=" + sd.doc + "  文档权值=" + doc.getBoost() + "  文档

评分=" + sd.score + "    ");
                System.out.println("size=" + doc.get("size") + "  name=" + doc.get("name"));
            }
        } catch (CorruptIndexException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if(searcher != null){
                try {
                    searcher.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }  

    /**
     * 测试一下评分效果
     */
    public static void main(String[] args) {
        new AdvancedSearchByScore().searchByCustomScoreQuery();
    }
}

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自定义评分条
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