// Build Java GS1-DataBar barcode object 
GS1DataBar barcode = new GS1DataBar(); 

// Encode GS1-DataBar data
barcode.setData("GS1DataBar-JAVA"); 

// Generate GS1DataBar barcode & print into Graphics2D object
barcode.drawBarcode("Java Graphics2D object"); 

// Generate GS1DataBar barcode & encode into GIF format
barcode.drawBarcode("C://barcode-gs1-databar.gif"); 

// Generate GS1DataBar barcode & render into JPEG format
barcode.drawBarcode("C://barcode-gs1-databar.jpg"); 

// Draw GS1DataBar barcode & paint into EPS image format
barcode.drawBarcode2EPS("C://barcode-gs1-databar.eps"); 

import com.onbarcode.barcode.AbstractBarcode;
import com.onbarcode.barcode.GS1DataBar;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
public class BarcodeServlet extends HttpServlet
{
 public void doGet(HttpServletRequest request, HttpServletResponse response)
 throws ServletException
 {
  try {
   GS1DataBar barcode = new GS1DataBar();
   barcode.setData("11111555551234");

   ServletOutputStream servletoutputstream = response.getOutputStream();

   response.setContentType("image/jpeg");
   response.setHeader("Pragma", "no-cache");
   response.setHeader("Cache-Control", "no-cache");
   response.setDateHeader("Expires", 0);

   // Generate EAN128 barcode & output to ServletOutputStream
   barcode.drawBarcode(servletoutputstream);

  } catch (Exception e) {
   throw new ServletException(e);
  }
 }
}