Lucene in der Praxis

import org.apache.lucene.analysis.de.GermanAnalyzer;
import org.apache.lucene.index.IndexWriter;

import java.io.*;
import java.util.*;

public
class IndexFiles 
{
  public static
  void main(String[] args)
  {
    try
    {
      Date start = new Date();

      IndexWriter writer = new IndexWriter(Const.INDEX_DIR, new GermanAnalyzer(), true);
      indexDocs(writer, new File(args[0]));

      writer.optimize();
      writer.close();
    }
    catch (Exception e)
    {
      System.out.println(" caught a " + e.getClass() + "\n with message: " + e.getMessage());
    }
  }

  public static void indexDocs(IndexWriter writer, File file)
    throws Exception
  {
    if (file.isDirectory())
    {
      String[] files = file.list();
      for (int i = 0; i < files.length; i++)
      indexDocs(writer, new File(file, files[i]));
    } 
    else
    {
      System.out.println("hinzugefuegt: " + file);
      writer.addDocument(FileDocument.Document(file));
    }
  }
}
        

import java.io.*;
import org.apache.lucene.document.*;

public
class FileDocument
{
  public static
  Document Document(File f)
    throws java.io.FileNotFoundException
  {
    Document doc = new Document();
    doc.add(Field.Text(Const.PATH_FIELD, f.getPath()));
    doc.add(Field.Keyword(Const.MOD_FIELD,
              DateField.timeToString(f.lastModified())));

    FileInputStream is = new FileInputStream(f);
    Reader reader = new BufferedReader(new InputStreamReader(is));
    doc.add(Field.Text(Const.DEF_FIELD, reader));

    return doc;
  }
}
        

import java.io.*;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.de.GermanAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.search.*;
import org.apache.lucene.queryParser.QueryParser;

public
class SearchFiles
{
  public static
  void main(String[] args)
  {
    try
    {
      Searcher searcher = new IndexSearcher(Const.INDEX_DIR);
      Analyzer analyzer = new GermanAnalyzer();

      BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
      // einlesen
      boolean lineEnd=false;
      while (!lineEnd)
      {
        System.out.print("Suchbegriff eingeben (<Enter>, um zu verlassen): ");
        String line = in.readLine();

        if (line.length() == -1)
          lineEnd=true;
        else
        {
          Query query = QueryParser.parse(line, Const.DEF_FIELD, analyzer);
          System.out.println("Suchbegriff: " + query.toString(Const.DEF_FIELD));

          Hits hits = searcher.search(query);
          System.out.println(hits.length() + " Dokumente gefunden");

          final int HITS_PER_PAGE = 10;
          int end = hits.length();
          for (int i=0; i<end; i++)
          {
            Document doc = hits.doc(i);
            String path = doc.get(Const.PATH_FIELD);
            System.out.println(i + ". " + path);
          }
        }
      }
      searcher.close();

    }
    catch (Exception e)
    {
      System.out.println(" caught a " + e.getClass() + "\n with message: " + e.getMessage());
    }
  }
}