关于lucene搜索时排序的问题

       在Lucene4.6中&＃xff0c;想要实现搜索结果按照时间倒序的效果&＃xff1a;如果两个文档得分相同&＃xff0c;那么就按照发布时间倒序排列&＃xff1b;否则就按照分数排列。这种效果在 Lucene4.6中实现起来极其简单&＃xff0c;直接利用search接口的Sort参数即可达成&＃xff0c;完全不需要像某些人说的重写Similarity那么麻烦。三 两行代码的事情&＃xff0c;体现了Make it simple, stupid的精髓。

package com.hankcs.test; 
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.document.*;
import org.apache.lucene.index.*;
import org.apache.lucene.queries.CustomScoreQuery;
import org.apache.lucene.queries.function.FunctionQuery;
import org.apache.lucene.queryparser.classic.ParseException;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.search.*;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.LockObtainFailedException;
import org.apache.lucene.store.RAMDirectory;
import org.apache.lucene.util.Version;import org.wltea.analyzer.lucene.IKAnalyzer; 
import java.io.IOException; 
/** * &＃64;author hankcs */
public class TestSortByTime{  public static void main(String[] args)    {   // Lucene Document的主要域名       String fieldName &＃61; "text";      // 实例化IKAnalyzer分词器       Analyzer analyzer &＃61; new IKAnalyzer();       Directory directory &＃61; null;        IndexWriter iwriter;        IndexReader ireader &＃61; null;        IndexSearcher isearcher;        try        {            //索引过程**********************************           //建立内存索引对象            directory &＃61; new RAMDirectory();             //配置IndexWriterConfig            IndexWriterConfig iwConfig &＃61; new IndexWriterConfig(Version.LUCENE_46, analyzer);  iwConfig.setOpenMode(IndexWriterConfig.OpenMode.CREATE_OR_APPEND);         iwriter &＃61; new IndexWriter(directory, iwConfig);            //写入索引            for (int i &＃61; 0; i < 3; &＃43;&＃43;i) {                int year &＃61; 2004 &＃43; i;                Document doc &＃61; new Document();                doc.add(new TextField(fieldName, year &＃43; "全民突击攻略", Field.Store.YES));doc.add(new IntField("date",  year * 10000 &＃43; 1111, Field.Store.YES));             iwriter.addDocument(doc);}            // 加入一个干扰文档            Document doc &＃61; new Document();            doc.add(new TextField(fieldName, "天天酷跑攻略", Field.Store.YES));            doc.add(new IntField("date",  20141111, Field.Store.YES));            iwriter.addDocument(doc);            iwriter.close();             //搜索过程**********************************            //实例化搜索器            ireader &＃61; DirectoryReader.open(directory);            isearcher &＃61; new IndexSearcher(ireader);             String keyword &＃61; "全民突击攻略";            //使用QueryParser查询分析器构造Query对象            QueryParser qp &＃61; new QueryParser(Version.LUCENE_46, fieldName, analyzer);         Query query &＃61; qp.parse(keyword);            System.out.println("Query &＃61; " &＃43; query);             //搜索相似度最高的5条记录            Sort sort &＃61; new Sort(new SortField("text", SortField.Type.SCORE), new SortField("date", SortField.Type.INT, true));            TopDocs topDocs &＃61; isearcher.search(query, 5, sort);            System.out.println("命中&＃xff1a;" &＃43; topDocs.totalHits);           //输出结果            ScoreDoc[] scoreDocs &＃61; topDocs.scoreDocs;            for (int i &＃61; 0; i < Math.min(5, scoreDocs.length); i&＃43;&＃43;){                Document targetDoc &＃61; isearcher.doc(scoreDocs[i].doc);                System.out.print(targetDoc.getField(fieldName).stringValue());                System.out.print(" , " &＃43; targetDoc.getField("date").numericValue());                System.out.println(" , " &＃43; scoreDocs[i].score);            }        } catch (CorruptIndexException e)        {           e.printStackTrace();        } catch (LockObtainFailedException e)        {            e.printStackTrace();        } catch (IOException e){            e.printStackTrace();        } catch (ParseException e)        {            e.printStackTrace();        } finally        {           if (ireader !&＃61; null)  {try{                    ireader.close();                } catch (IOException e)                { e.printStackTrace();                } }           if (directory !&＃61; null)            {    try                {       directory.close();             } catch (IOException e)                {e.printStackTrace();                }    }        }    }}