Saving the contents of a JPanel in a JPG image

The following example saves the content of the JPanel in the file test.jpg when the JFrame is closed. Play around with the saveComponent method that takes any sort of Component as a parameter.

Main.java:

import com.sun.image.codec.jpeg.*;
import javax.swing.border.*;
import java.awt.image.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.*;
import java.io.*;
 
public class Main extends JFrame 
{
   JPanel panel;
 
   public Main() {
      addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent we) { 
            saveComponent(panel, "test.jpg");
            System.exit(0);
         }
      });
 
      panel = createContactPanel();
 
      JScrollPane sp = new JScrollPane();
      sp.setViewportView(panel);
 
      getContentPane().setLayout(new BorderLayout());
      getContentPane().add(sp, BorderLayout.CENTER); 
   }
 
   public JPanel createContactPanel() {
      JLabel titleLbl      = new JLabel("Title");
      JLabel firstNameLbl  = new JLabel("First name");
      JLabel lastNameLbl   = new JLabel("Last name");
      JLabel addressLbl    = new JLabel("Address");
      JLabel cityLbl       = new JLabel("City");
      JLabel zipLbl        = new JLabel("Postal code");
      JLabel countryLbl    = new JLabel("Country");
      JLabel phoneLbl      = new JLabel("Phone number");
      JLabel faxLbl        = new JLabel("Fax number");
      JLabel emailLbl      = new JLabel("E-mail");
      JLabel birthdayLbl   = new JLabel("Birthdate");
      JLabel pickchoiceLbl = new JLabel("Pick a choice");
      JLabel creditCardTypeLbl     = new JLabel("Credit card type");
      JLabel creditCardNumberLbl   = new JLabel("Credit card number");
      JLabel expirationLbl         = new JLabel("Expiration date");
 
      JComboBox titleCombo = new JComboBox(
             new String[] { "-", "Mr", "Mrs", "Miss" });
      JTextField firstNameTf    = new JTextField();
      JTextField lastNameTf     = new JTextField();
      JTextField address1Tf     = new JTextField();
      JTextField address2Tf     = new JTextField();
      JTextField cityTf         = new JTextField();
      JTextField zipTf          = new JTextField();
      JTextField countryTf      = new JTextField();
      JTextField phoneTf        = new JTextField();
      JTextField faxTf          = new JTextField();
      JTextField emailTf        = new JTextField();
      JComboBox bd1Combo = new JComboBox();
      for (int i=1; i<=12; i++) bd1Combo.addItem(""+i);
      JComboBox bd2Combo = new JComboBox();
      for (int i=1; i<=31; i++) bd2Combo.addItem(""+i);
      JComboBox bd3Combo = new JComboBox();
      for (int i=1900; i<2000; i++) bd3Combo.addItem(""+i);
      JComboBox referCombo = new JComboBox();
      referCombo.addItem("Friend");
      referCombo.addItem("Search engine");
      referCombo.addItem("Print Media");
      referCombo.addItem("Banner Add");
      referCombo.addItem("Other");
      JComboBox creditCardTypeCombo = new JComboBox();
      creditCardTypeCombo.addItem("VISA");
      creditCardTypeCombo.addItem("MasterCard");
      creditCardTypeCombo.addItem("American Express");
      JTextField creditCardNumberTf = new JTextField();
      JComboBox expiration1Combo = new JComboBox();
      for (int i=1; i<=12; i++) expiration1Combo.addItem(""+i);
      JComboBox expiration2Combo = new JComboBox();
      for (int i=1; i<=31; i++) expiration2Combo.addItem(""+i);
      JComboBox expiration3Combo = new JComboBox();
      for (int i=1900; i<=2000; i++) expiration3Combo.addItem(""+i);
 
      JPanel panelGeneral = new JPanel();
      panelGeneral.setLayout(null);
      panelGeneral.add(titleLbl);
      panelGeneral.setBorder(new TitledBorder("General Information"));
      titleLbl.setBounds(20, 20, 150, 20);
      panelGeneral.add(firstNameLbl);
      firstNameLbl.setBounds(20, 50, 150, 20);
      panelGeneral.add(lastNameLbl);
      lastNameLbl.setBounds(20, 80, 150, 20);
      panelGeneral.add(addressLbl);
      addressLbl.setBounds(20, 110, 150, 20);
      panelGeneral.add(cityLbl);
      cityLbl.setBounds(20, 170, 150, 20);
      panelGeneral.add(zipLbl);
      zipLbl.setBounds(20, 200, 150, 20);
      panelGeneral.add(countryLbl);
      countryLbl.setBounds(20, 230, 150, 20);
      panelGeneral.add(phoneLbl);
      phoneLbl.setBounds(20, 260, 150, 20);
      panelGeneral.add(faxLbl);
      faxLbl.setBounds(20, 290, 150, 20);
      panelGeneral.add(emailLbl);
      emailLbl.setBounds(20, 320, 150, 20);
      panelGeneral.add(birthdayLbl);
      birthdayLbl.setBounds(20, 350, 150, 20); 
      panelGeneral.add(titleCombo);
      titleCombo.setBounds(150, 20, 60, 20);
      panelGeneral.add(firstNameTf);
      firstNameTf.setBounds(150, 50, 200, 20);
      panelGeneral.add(lastNameTf);
      lastNameTf.setBounds(150, 80, 200, 20);
      panelGeneral.add(address1Tf);
      address1Tf.setBounds(150, 110, 200, 20);  
      panelGeneral.add(address2Tf);
      address2Tf.setBounds(150, 140, 200, 20);  
      panelGeneral.add(cityTf);
      cityTf.setBounds(150, 170, 200, 20);
      panelGeneral.add(zipTf);
      zipTf.setBounds(150, 200, 200, 20);
      panelGeneral.add(countryTf);
      countryTf.setBounds(150, 230, 200, 20);
      panelGeneral.add(phoneTf);
      phoneTf.setBounds(150, 260, 200, 20);
      panelGeneral.add(faxTf);
      faxTf.setBounds(150, 290, 200, 20);
      panelGeneral.add(emailTf);
      emailTf.setBounds(150, 320, 200, 20);
      panelGeneral.add(bd1Combo);
      bd1Combo.setBounds(150, 350, 60, 20);
      panelGeneral.add(bd2Combo);
      bd2Combo.setBounds(220, 350, 60, 20);
      panelGeneral.add(bd3Combo);
      bd3Combo.setBounds(290, 350, 60, 20);
 
      JPanel panelReferral = new JPanel();
      panelReferral.setLayout(null);
      panelReferral.setBorder(new TitledBorder("Where did you hear about us?"));
      panelReferral.add(pickchoiceLbl);
      pickchoiceLbl.setBounds(20, 20, 150, 20);
      panelReferral.add(referCombo);
      referCombo.setBounds(150, 20, 100, 20);
 
      JPanel panelCreditCard = new JPanel();
      panelCreditCard.setLayout(null);
      panelCreditCard.setBorder(new TitledBorder("Payment method"));
      panelCreditCard.add(creditCardTypeLbl);
      creditCardTypeLbl.setBounds(20, 20, 150, 20);
      panelCreditCard.add(creditCardNumberLbl);
      creditCardNumberLbl.setBounds(20, 50, 150, 20);
      panelCreditCard.add(expirationLbl);
      expirationLbl.setBounds(20, 80, 150, 20);
 
      panelCreditCard.add(creditCardTypeCombo);
      creditCardTypeCombo.setBounds(150, 20, 100, 20);
      panelCreditCard.add(creditCardNumberTf);
      creditCardNumberTf.setBounds(150, 50, 150, 20);
      panelCreditCard.add(expiration2Combo);
      expiration2Combo.setBounds(220, 80, 60, 20);
      panelCreditCard.add(expiration3Combo);
      expiration3Combo.setBounds(290, 80, 60, 20);
 
      JPanel panel = new JPanel();
      panel.setLayout(null);
      panel.add(panelGeneral);
      panelGeneral.setBounds(10, 20, 370, 400);
      panel.add(panelReferral);
      panelReferral.setBounds(10, 430, 370, 50);
      panel.add(panelCreditCard);
      panelCreditCard.setBounds(10, 490, 370, 120);
      
      panel.setPreferredSize(new Dimension(380, 620)); 
 
      return panel;
   }
 
   public void saveComponent(Component c, String filename) {
      Dimension d = c.getPreferredSize();
      BufferedImage bi = new BufferedImage((int) d.getWidth(), (int) d.getHeight(),
                                           BufferedImage.TYPE_INT_RGB);
 
      Graphics2D g2 = bi.createGraphics();
      g2.setClip(0, 0, (int) d.getWidth(), (int) d.getHeight());
      c.paint(g2);
      try {
         BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(filename));
         JPGWrite(bi, bos);
      }
      catch(Exception e) {
         e.printStackTrace();
      }
   }
 
   public static void JPGWrite(BufferedImage bi, OutputStream out) throws IOException {
      JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
      JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bi);
      param.setQuality(1f, true);
      encoder.encode(bi, param);
   }
 
   public static void main(String []args) {
      Main main = new Main();
      main.setSize(400, 400);
      main.setVisible(true);
   }
}