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About Byron Kiourtzoglou

Byron is a master software engineer working in the IT and Telecom domains. He is an applications developer in a wide variety of applications/services. He is currently acting as the team leader and technical architect for a proprietary service creation and integration platform for both the IT and Telecom industries in addition to a in-house big data real-time analytics solution. He is always fascinated by SOA, middleware services and mobile development. Byron is co-founder and Executive Editor at Java Code Geeks.

Create Lucene Index

package com.javacodegeeks.lucene;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import org.apache.lucene.analysis.SimpleAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.store.FSDirectory;
public class SimpleFileIndexer {
    public static void main(String[] args) throws Exception {


  File indexDir = new File("C:/index/");

  File dataDir = new File("C:/programs/eclipse/workspace/");

  String suffix = "java";


  SimpleFileIndexer indexer = new SimpleFileIndexer();


  int numIndex = indexer.index(indexDir, dataDir, suffix);


  System.out.println("Total files indexed " + numIndex);

    private int index(File indexDir, File dataDir, String suffix) throws Exception {


  IndexWriter indexWriter = new IndexWriter(


    new SimpleAnalyzer(),





  indexDirectory(indexWriter, dataDir, suffix);


  int numIndexed = indexWriter.maxDoc();




  return numIndexed;

    private void indexDirectory(IndexWriter indexWriter, File dataDir, 

     String suffix) throws IOException {

  File[] files = dataDir.listFiles();

  for (int i = 0; i < files.length; i++) {

File f = files[i];

if (f.isDirectory()) {

    indexDirectory(indexWriter, f, suffix);


else {

    indexFileWithIndexWriter(indexWriter, f, suffix);


    private void indexFileWithIndexWriter(IndexWriter indexWriter, File f, 

String suffix) throws IOException {

  if (f.isHidden() || f.isDirectory() || !f.canRead() || !f.exists()) {



  if (suffix!=null && !f.getName().endsWith(suffix)) {



  System.out.println("Indexing file " + f.getCanonicalPath());


  Document doc = new Document();

  doc.add(new Field("contents", new FileReader(f)));

  doc.add(new Field("filename", f.getCanonicalPath(), 

     Field.Store.YES, Field.Index.ANALYZED));



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