public static  void main(String[] argv) 
{
		  // document id iterator
    try {
      String index = "index";
      boolean create = false;
      File root = null;
      String usage = "IndexHTML [-create] [-index < index >] < root_directory >";
      if (argv.length == 0) {
        System.err.println("Usage: " + usage);
        return;
      }
      for (int i = 0; i <  argv.length; i++) {
        if (argv[i].equals("-index")) {		  // parse -index option
          index = argv[++i];
        } else if (argv[i].equals("-create")) {	  // parse -create option
          create = true;
        } else if (i != argv.length-1) {
          System.err.println("Usage: " + usage);
          return;
        } else
          root = new File(argv[i]);
      }
      Date start = new Date();
      if (!create) {				  // delete stale docs
        deleting = true;
        indexDocs(root, index, create);
      }
      writer = new IndexWriter(index, new StandardAnalyzer(), create);
      writer.setMaxFieldLength(1000000);
      indexDocs(root, index, create);		  // add new docs
      System.out.println("Optimizing index...");
      writer.optimize();
      writer.close();
      Date end = new Date();
      System.out.print(end.getTime() - start.getTime());
      System.out.println(" total milliseconds");
    } catch (Exception e) {
      System.out.println(" caught a " + e.getClass() +
          "\n with message: " + e.getMessage());
    }
}

Indexer for HTML files.