学步园

 

//在C盘下创建一个s的文件夹,然后在s文件夹中新建三个文件:1.txt,3.txt,2.txt,,1.txt中输入"想 飞的我",2.txt中输入"想飞",3.txt中输入"我".接下来我们来看下面的测试:

package test;

import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.Reader;
import java.util.Date;

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.index.CorruptIndexException;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.store.LockObtainFailedException;
//需要的apache下的lucene包
/**
* 创建索引文件
*/
public class CreateIndex {
public static boolean createDocumentIndex() 
{
   boolean bool = false;
   try{
   //需要索引的目录
   File dirpath = new File("c:\\s");
   //将索引文件存放在index目录下
   File indexpath = new File("c:\\index");
   //创建分词器
   Analyzer analyzer = new StandardAnalyzer();
   IndexWriter index = new IndexWriter(indexpath,analyzer,true);
  
   File[] txtfiles = dirpath.listFiles();
  
   long starttime = new Date().getTime();
  
   for(int i=0;i<txtfiles.length;i++)
   {
    if(txtfiles[i].isFile())
    {
     System.out.println("文件"+txtfiles[i].getCanonicalPath()+"正在索引中...");
     Reader read = new FileReader(txtfiles[i]);
     Document doc = new Document();
     doc.add(new Field("content",read));
     doc.add(new Field("path",txtfiles[i].getAbsolutePath(),Field.Store.YES,Field.Index.NO));
     index.addDocument(doc);
    }
   }
   index.optimize();
   index.close();
        long endTime = new Date().getTime();   
        System.out   
                .println("这花费了" 
                        + (endTime - starttime)   
                        + " 毫秒来把文档增加到索引里面去!" 
                        + dirpath.getPath());   
   bool=true;
   }
   catch(Exception e)
   {
    bool = false;
   }
   return bool;
}
/**
* 测试
*/
public static void main(String[] a)
{
CreateIndex.createDocumentIndex();
}
}

测试结果:

文件C:\s\1.txt正在索引中...
文件C:\s\2.txt正在索引中...
文件C:\s\3.txt正在索引中...
这花费了141 毫秒来把文档增加到索引里面去!c:\index


package test;

import java.io.IOException;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.queryParser.ParseException;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.Hits;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
/**
* 从索引文件查询内容
* @author Jan
*
*/
public class QueryString 
{
public static void main(String[] args) throws IOException, ParseException {   
         Hits hits = null;   
         String queryString = "我";   
         Query query = null;   
         IndexSearcher searcher = new IndexSearcher("c:\\index");   
   
         Analyzer analyzer = new StandardAnalyzer();   
         try {   
             QueryParser qp = new QueryParser("content", analyzer);   
             query = qp.parse(queryString);   
         } catch (ParseException e) {   
         }   
         if (searcher != null) {   
             hits = searcher.search(query);   
             if (hits.length() > 0) {   
                 System.out.println("找到:" + hits.length() + " 个结果!");   
             }   
         }   
     }   
}

测试结果:

找到:2 个结果!