用Java lucene 写的一个搜索引擎

package org.itat.test;

import java.io.File;
import java.io.FileReader;
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.index.CorruptIndexException;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.queryParser.ParseException;
import org.apache.lucene.queryParser.QueryParser;
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.LockObtainFailedException;
//import org.apache.lucene.store.RAMDirectory;
import org.apache.lucene.util.Version;

/**
*lucene3.5中主要包含以下三部分：
*一、建立索引
*二、分词部分
*三、搜索部分
**/
public class hellolucene {
	public hellolucene(StringBuffer sb){
		//index();
		searcher(sb);
	}
	/**
	 * 建立索引
	 */
    public void index(){
    	IndexWriter writer=null;
    	try{
    		//1、创建Directory
        	//Directory directory=new RAMDirectory();将索引建立在内存中
    		Directory directory=FSDirectory.open(new File("D:\\lucene\\aaa"));//将索引建立在硬盘中
        	//2、创建IndexWriter writer
        	IndexWriterConfig iwc = new IndexWriterConfig(Version.LUCENE_35,new StandardAnalyzer(Version.LUCENE_35));
        	
    		writer = new IndexWriter(directory,iwc);
    		//3、创建Document对象
    		Document doc = null;
    		//4、为Document添加Field
    		File f = new File("d:/kankan");//指定搜索路径
    		for(File file:f.listFiles()){
    			doc = new Document();
    			doc.add(new Field("content",new FileReader(file)));
    			doc.add(new Field("filename",file.getName(),Field.Store.YES,Field.Index.NOT_ANALYZED));
    			doc.add(new Field("path",file.getAbsolutePath(),Field.Store.YES,Field.Index.NOT_ANALYZED));
    			//5、通过IndexWriter添加文档到索引中
    			writer.addDocument(doc);
    		}
    		
    	}catch(CorruptIndexException e){
    		e.printStackTrace();
    	}catch(LockObtainFailedException e){
    		e.printStackTrace();
    	}catch(IOException e){
    		e.printStackTrace();
    	}finally{
    		try{
    			if(writer!=null) writer.close();
    		}catch(CorruptIndexException e){
        		e.printStackTrace();
        	}catch(IOException e){
        		e.printStackTrace();
        	}
    	}
    }
    /**
     * 搜索
     * @throws ParseException 
     */
    public StringBuffer searcher(StringBuffer sb){
    	try{
    	//1.创建Directory
    	Directory directory=FSDirectory.open(new File("d:/lucene/aaa"));
    	//2.创建IndexReader
    	IndexReader reader = IndexReader.open(directory);
    	//3.根据IndexReader创建IndexSearcher
    	IndexSearcher searcher = new IndexSearcher(reader);
    	//4.创建搜索的Query
    	//创建parser来确定搜索的内容
    	QueryParser parser = new QueryParser(Version.LUCENE_35,"content",new StandardAnalyzer(Version.LUCENE_35));
    	Query query = parser.parse("一群大雁");
    	//5.根据search搜索并且返回TopDocs
    	TopDocs tds = searcher.search(query, 10);
    	//6.根据TopDocs获取ScoreDoc对象
    	ScoreDoc[] sds=tds.scoreDocs;
    	for(ScoreDoc sd:sds){
    	//7.根据search和ScordDoc对象获取具体的Document对象
        	Document d=searcher.doc(sd.doc);
        //8.根据Document对象获取需要的值	
        	System.out.println(d.get("filename")+"["+d.get("path")+"]");
        	sb.append(d.get("filename")+"["+d.get("path")+"]");
        	return sb;
    	}//关闭reader
    	   reader.close();
    	} catch(CorruptIndexException e){
    		e.printStackTrace();
    	} catch(IOException e){
    		e.printStackTrace();
    	} catch (ParseException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return sb;
    }
    public static void main (String args[])
    {
    	StringBuffer sb = new StringBuffer();
    	new hellolucene(sb);
    	
    }
}