用Lucene检索数据库

http://blog.sina.com.cn/s/blog_82ac67c101012r9z.html

package com.javabean;

import java.io.File;
import java.io.IOException;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import org.apache.lucene.analysis.Analyzer;
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.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.queryParser.MultiFieldQueryParser;
import org.apache.lucene.queryParser.ParseException;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.queryParser.QueryParser.Operator;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.store.SimpleFSDirectory;
import org.apache.lucene.util.Version;

public class lucene
{
 public void createIndexFile() {    
         IndexWriter indexWriter=null;    
          try {    
             // 需要的分词器    
             Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_36);    
             // 创建的是哪个版本的IndexWriterConfig    
             IndexWriterConfig indexWriterConfig = new IndexWriterConfig(    
                     Version.LUCENE_36, analyzer);    
              // 创建系统文件-----    

　　　　  Directory directory = FSDirectory.open(new File(indexPath));

　　　　  

　　　　 // 这里千万不能用SimpleFSDirectory, 不然会报错, 找错找到你哭
             /* Directory directory = new SimpleFSDirectory(new File("D:\tomcat-6.0.35\webapps\jsp_flex\index"));    */

              indexWriter = new IndexWriter(directory,indexWriterConfig);
              //访问数据库拿数据
              DBConnect db = new DBConnect();
        String sql = "select * from book";
        ResultSet rs = db.select(sql);
        while(rs.next())
        {
              //indexWriter添加索引    
              Document doc=new Document();    
              //文本中添加内容      
              doc.add(new Field("ISBN",rs.getString(1).toString(),Store.YES,Index.ANALYZED));    
              doc.add(new Field("bookname",rs.getString(2).toString(),Store.YES,Index.ANALYZED));    
              doc.add(new Field("author",rs.getString(3).toString(),Store.YES,Index.ANALYZED));   
              doc.add(new Field("leibie",rs.getString(6).toString(),Store.YES,Index.ANALYZED));
              doc.add(new Field("jianjie",rs.getString(10).toString(),Store.YES,Index.ANALYZED));
              //添加到索引中去   
              indexWriter.addDocument(doc);
        }
                     
          } catch (IOException e) {       
              e.printStackTrace();    
          } catch (SQLException e) {
     e.printStackTrace();
    }finally{    
              if(indexWriter!=null){    
                  try {  
                   indexWriter.commit();
                      indexWriter.close();    
                  }  catch (IOException e) {        
                      e.printStackTrace();    
                  }    
              }    
          }    
      }    
     
      public void seacher(String queryString) throws IOException
      {
       FSDirectory fs;
       try {   
        fs =  FSDirectory.open(new File("D:\tomcat-6.0.35\webapps\jsp_flex\index"));  
        IndexReader ir = IndexReader.open(fs);  
        long start  = System.currentTimeMillis();  
        IndexSearcher search = new IndexSearcher(ir);  
        String key = queryString;  
        String fieds[] = new String[]{"ISBN","bookname","author","leibie","jianjie"};  
        Analyzer ik = new StandardAnalyzer(Version.LUCENE_36);   
        MultiFieldQueryParser m = new MultiFieldQueryParser(Version.LUCENE_36, fieds, ik);  
        m.setDefaultOperator(Operator.AND);  
        Query query = m.parse(key) ;  
           ScoreDoc[] hits = search.search(query, null, 1000).scoreDocs;   
        System.out.println("共命中"+hits.length+"条记录");     
        for(ScoreDoc scoreDoc:hits)  
        {  
            Document doc= search.doc(scoreDoc.doc);  
            System.out.println(scoreDoc.score + " ISBN:"+doc.get("ISBN")+" bookname:"+doc.get("bookname")+" leibie:"+doc.get("leibie"));  
        }             
           System.out.println("执行时间:"+(System.currentTimeMillis()-start)+"毫秒");  
         }
       catch (IOException e)
       {  
         e.printStackTrace();  
       } catch (ParseException e) {
        e.printStackTrace();  
          }    
       
       
      }

public static void main(String[] args) throws IOException
      {    
       lucene test = new lucene();
      // test.createIndexFile();
       test.seacher("中国");
       
      }

}