Cоздание документа формата doc

С помощью Apache POI

import java.io.File;
import java.io.FileOutputStream;
import org.apache.poi.hwpf.HWPFDocument;
public class CreateDocument {
   public static void main(String[] args) throws Exception  {
      HWPFDocument document = new HWPFDocument(); 
      try (FileOutputStream out = new FileOutputStream(new File("example.doc"))) {
          document.write(out);
      }
   }
}