lucene实现结果分组统计,类似group by

import java.io.IOException;

import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.Field.Index;
import org.apache.lucene.document.Field.Store;
import org.apache.lucene.index.CorruptIndexException;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.IndexWriter.MaxFieldLength;
import org.apache.lucene.search.DuplicateFilter;
import org.apache.lucene.search.Filter;
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.LockObtainFailedException;
import org.apache.lucene.store.RAMDirectory;
import org.apache.lucene.util.Version;


public class DuplicateFilterTest {

    public static void main(String[] args) {

        Directory dir = new RAMDirectory();

        Document doc = new Document();
        doc.add(new Field("id", "binbin", Store.YES, Index.NOT_ANALYZED));
        doc.add(new Field("string", "haha", Store.YES, Index.NOT_ANALYZED));
        doc.add(new Field("time", "20100801", Store.YES, Index.NOT_ANALYZED));
        doc.add(new Field("duplicate", "123456", Store.YES, Index.NOT_ANALYZED));

        Document doc1 = new Document();
        doc1.add(new Field("id", "yaoyao", Store.YES, Index.NOT_ANALYZED));
        doc1.add(new Field("string", "haha", Store.YES, Index.NOT_ANALYZED));
        doc1.add(new Field("time", "20100801", Store.YES, Index.NOT_ANALYZED));
        doc1.add(new Field("duplicate", "123456", Store.YES,Index.NOT_ANALYZED));
        
        Document doc11 = new Document();
        doc11.add(new Field("id", "liufeng", Store.YES, Index.NOT_ANALYZED));
        doc11.add(new Field("string", "haha", Store.YES, Index.NOT_ANALYZED));
        doc11.add(new Field("time", "20100801", Store.YES, Index.NOT_ANALYZED));
        doc11.add(new Field("duplicate", "123456", Store.YES,Index.NOT_ANALYZED));
                        

        Document doc2 = new Document();
        doc2.add(new Field("id", "zhangjian", Store.YES, Index.NOT_ANALYZED));
        doc2.add(new Field("string", "haha", Store.YES, Index.NOT_ANALYZED));
        doc2.add(new Field("time", "20100801", Store.YES, Index.NOT_ANALYZED));
        doc2.add(new Field("duplicate", "123455", Store.YES,Index.NOT_ANALYZED));
                
                        

        Document doc3 = new Document();
        doc3.add(new Field("id", "liweicheng", Store.YES, Index.NOT_ANALYZED));
        doc3.add(new Field("string", "haha", Store.YES, Index.NOT_ANALYZED));
        doc3.add(new Field("time", "20100801", Store.YES, Index.NOT_ANALYZED));
        doc3.add(new Field("duplicate", "123451", Store.YES,Index.NOT_ANALYZED));
                
                        

        try {
            IndexWriter indexWriter = new IndexWriter(dir,
                    new StandardAnalyzer(Version.LUCENE_29), true,
                    MaxFieldLength.LIMITED);
            indexWriter.addDocument(doc);
            indexWriter.addDocument(doc1);
            indexWriter.addDocument(doc11);
            indexWriter.addDocument(doc2);
            indexWriter.addDocument(doc3);
            indexWriter.close();

            Query query = new TermQuery(new Term("string", "haha"));
            Filter filter = new DuplicateFilter("duplicate");
            IndexSearcher indexSearcher = new IndexSearcher(dir);
            TopDocs top = indexSearcher.search(query, filter, 200);
            ScoreDoc[] scoreDocs = top.scoreDocs;

            for (ScoreDoc scoreDoc : scoreDocs) {
                Document rdoc = indexSearcher.doc(scoreDoc.doc);
                System.out.print("id:"+rdoc.get("id") +"  排重ID:" +rdoc.get("duplicate"));
                Query queryDuplicate = new TermQuery(new Term("duplicate", rdoc.get("duplicate")));
               System.out.println("转载:"+ indexSearcher.search(queryDuplicate, 100).totalHits
               );
                
            }

        } catch (CorruptIndexException e) {
            e.printStackTrace();
        } catch (LockObtainFailedException e) {
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }
}

id:liufeng  排重ID:123456转载:3
id:zhangjian  排重ID:123455转载:1
id:liweicheng  排重ID:123451转载:1