lucene 分词索引 过滤

import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.Hits;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Sort;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.index.Term;
import java.util.BitSet;
import java.io.IOException;

class AdvancedFilter extends Filter
{    
    public BitSet bits(IndexReader reader) throws IOException
    {
        final int SECURITY_ADVANCED = 0;
        final BitSet bits = new BitSet(reader.maxDoc());
        
        bits.set(0, bits.size() - 1);
        
        Term term = new Term("level", SECURITY_ADVANCED + "");
        
        IndexSearcher searcher = new IndexSearcher(reader);
        Hits hits = searcher.search(new TermQuery(term));
        for (int i = 0; i < hits.length(); i++)
            bits.set(hits.id(i), false);
        
        return bits;
    }
}

public class TestSearch
{
    public static final String indexpath = "/root/index";
    
    public static final int SECURITY_ADVANCED = 0;
    public static final int SECURITY_MIDDLE = 1;
    public static final int SECURITY_NORMAL = 2;
    
    public static void main(String args[]) throws Exception
    {
        IndexWriter writer = new IndexWriter(indexpath, new StandardAnalyzer(), true);
        
        Document doc1 = new Document();
        
        Field field1 = new Field("booknum", "00001", Field.Store.YES, Field.Index.UN_TOKENIZED);
        Field field2 = new Field("content", "fan fei", Field.Store.YES, Field.Index.TOKENIZED);
        Field field3 = new Field("level", SECURITY_ADVANCED + "", Field.Store.YES, Field.Index.UN_TOKENIZED);
        
        doc1.add(field1);
        doc1.add(field2);
        doc1.add(field3);
        
        Document doc2 = new Document();
        
        Field field4 = new Field("booknum", "00002", Field.Store.YES, Field.Index.UN_TOKENIZED);
        Field field5 = new Field("content", "fan song", Field.Store.YES, Field.Index.TOKENIZED);
        Field field6 = new Field("level", SECURITY_MIDDLE + "", Field.Store.YES, Field.Index.UN_TOKENIZED);
        
        doc2.add(field4);
        doc2.add(field5);
        doc2.add(field6);
        
        Document doc3 = new Document();
        
        Field field7 = new Field("booknum", "00003", Field.Store.YES, Field.Index.UN_TOKENIZED);
        Field field8 = new Field("content", "fan ning", Field.Store.YES, Field.Index.TOKENIZED);
        Field field9 = new Field("level", SECURITY_NORMAL + "", Field.Store.YES, Field.Index.UN_TOKENIZED);
        
        doc3.add(field7);
        doc3.add(field8);
        doc3.add(field9);
        
        writer.addDocument(doc1);
        writer.addDocument(doc2);
        writer.addDocument(doc3);
        writer.close();
        
        IndexSearcher searcher = new IndexSearcher(indexpath);
        
        QueryParser parser = new QueryParser("content", new StandardAnalyzer());
        Query query = parser.parse("fan");
        
        Hits hits = searcher.search(query, new AdvancedFilter());
        for (int i = 0; i < hits.length(); i++)
            System.out.println(hits.doc(i));
    }
}