Generador de códigos QR (Quick Response)

import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.imageio.ImageIO; 
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Writer;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.EnumMap;
/**
 * @web https://www.jc-mouse.net/
 * @author Mouse
 */
public class MyQRCreator {

    /** Constructor de clase */
    public MyQRCreator(){}

    /**
 * Metodo que crea el QR
 * @param String data Texto a codificar
 * @param int size dimension (Alto,ancho) de la imagen a generar
 * @return BufferedImage
 */
    public BufferedImage createQR(String data, int size)
    {
        BitMatrix matrix;
        Writer writer = new MultiFormatWriter();
        try {            
            EnumMap<EncodeHintType,String> hints = new EnumMap<EncodeHintType,String>(EncodeHintType.class);
            hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");            
            matrix = writer.encode(data, BarcodeFormat.QR_CODE, size, size, hints);
            ByteArrayOutputStream output = new ByteArrayOutputStream();
            MatrixToImageWriter.writeToStream(matrix, "PNG", output);
            byte[] data_array = output.toByteArray();
            ByteArrayInputStream input = new ByteArrayInputStream(data_array);
            return ImageIO.read(input);            
        } catch (com.google.zxing.WriterException ex) {
            System.err.println(ex.getMessage());
        } catch (IOException ex) {
            System.err.println(ex.getMessage());
        }
        return null;
    }

}//end:MyQRCreator

    private void BtnCreateActionPerformed(java.awt.event.ActionEvent evt) {                                          

        if(TxtContent.getText().length()>0)
        {
            MyQRCreator qr = new MyQRCreator();
            QRDialog qRDialog = new QRDialog(this,true);            
            qRDialog.setImageQR( qr.createQR(TxtContent.getText(), (Integer)SpDimension.getValue()) );
            qRDialog.setVisible(true);    
        }  

    }

    BufferedImage bufferedImage;
    /**
 * Creates new form QRDialog
 */
    public QRDialog(java.awt.Frame parent, boolean modal) {
        super(parent, modal);
        initComponents();

        setTitle("QR");
        jLabel1.setText("");
        jLabel1.setToolTipText("Click to save");
        setLocationRelativeTo(null);        
        setBackground(Color.white);
    }

    public void setImageQR(BufferedImage bufferedImage)
    {
        if(bufferedImage!=null)
        {
            this.bufferedImage = bufferedImage;
            ImageIcon icon = new ImageIcon(bufferedImage);            
            setSize(icon.getIconWidth()+20,icon.getIconHeight()+40);
            jLabel1.setIcon( icon );                        
        }
    }

    private void jLabel1MouseClicked(java.awt.event.MouseEvent evt) {                                     
        JFileChooser fileChooser = new JFileChooser();
        fileChooser.setDialogTitle("Save QR");
        FileFilter filter = new FileNameExtensionFilter("QR Image", "PNG");
        fileChooser.addChoosableFileFilter(filter);
        int userSelection = fileChooser.showSaveDialog(this);
        if (userSelection == JFileChooser.APPROVE_OPTION)
        {
            File fileToSave = fileChooser.getSelectedFile();
            if (!fileToSave.toString().endsWith(".png"))
            {
             fileToSave = new File(fileChooser.getSelectedFile()+".png");
            }
            try {            
                ImageIO.write(bufferedImage, "png", fileToSave);
            } catch (IOException ex) {
                System.err.println( ex.getMessage() );
            }
            dispose();
        }
    }