BarCode barcode = new BarCode(); 

// set barcode properties
barcode.setSymbologyType(BarCode.UPCA_2); 
barcode.setCodeText("11000000000"); 
barcode.setSupplementData("22"); 
  
// draw and generate barcode to buffered image object
BufferedImage upcaImage = barcode.drawBarCode2Image(); 

public class BarcodeServlet extends HttpServlet { 
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException 
    { 
        try { 
            BarCode barcode = new BarCode(); 

            // set barcode properties 
            barcode.setSymbologyType(BarCode.UPCA); 
            barcode.setCodeText("11000000000");
            
            // draw and generate barcode to response's ServletOutputStream 
            ServletOutputStream servletoutputstream = response.getOutputStream(); 
            
            barcode.drawBarCode2Stream(servletoutputstream); 

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

private static void demoLinearBarcode() throws Exception 
{ 
    BarCode barcode = new BarCode(); 

    // set barcode properties 
    barcode.setSymbologyType(BarCode.UPCA); 
    barcode.setCodeText("11000000000"); 

    // create image object 
    java.awt.image.BufferedImage image = new java.awt.image.BufferedImage(300,300,java.awt.image.BufferedImage.TYPE_BYTE_INDEXED ); 
    // get graphic context of image 
    java.awt.Graphics2D imgGraphics = image.createGraphics(); 

    // draw barcode to specified location in Rectangle 
    barcode.paintBarCode(imgGraphics, new java.awt.Rectangle(0, 0, 300, 300)); 
}