Lucene2.0简单例子

package gt.test.lucene;

import java.io.IOException;

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.IndexWriter;
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;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.RAMDirectory;

public class Test {

 /**
  * @param args
  * @author Goodtiger 
  */
 public static void main(String[] args) {
  try {
   Analyzer analyzer = new StandardAnalyzer();

   //将索引存在内存中
   Directory directory = new RAMDirectory();
   //将索引存在磁盘的话，用下面这句
   //Directory directory = FSDirectory.getDirectory("/tmp/testindex", true);
   IndexWriter iwriter = new IndexWriter(directory, analyzer, true);
   iwriter.setMaxFieldLength(25000);
   Document doc = new Document();
   String text = "This is the text to be indexed.";
   doc.add(new Field("fieldname", text, Field.Store.YES,
       Field.Index.TOKENIZED));
   iwriter.addDocument(doc);
   iwriter.close();
   
   
   IndexSearcher isearcher = new IndexSearcher(directory);
   // Parse a simple query that searches for "text":
   QueryParser parser = new QueryParser("fieldname",analyzer);
   Query query = parser.parse("text");
   
   Hits hits = isearcher.search(query);
   if(hits.length() == 1)
   {
    System.out.println("搜索\"text\"");
    Document d = hits.doc(0);
    System.out.println(d.get("fieldname"));
   }else
   {
    System.out.println("没有搜索到结果");
   }
   // 遍历搜索结果:
   for (int i = 0; i < hits.length(); i++) {
     Document hitDoc = hits.doc(i);
     System.out.println(hitDoc.get("fieldname"));
   }
   isearcher.close();
   directory.close();
  } catch (IOException e) {
   e.printStackTrace();
  } catch (ParseException e) {
   e.printStackTrace();
  } 

 }

}