JAVA Drawing Graphics Save as JPEG?

Question

My problem is this, I am trying to save my g2 graphic image to a jpg. This is how I have things setup, I will show code and my thoughts. What I need is help to figure out how I could save seperate .java files graphics g to the jpg format from a JFileChooser in a different .java file.
HERE IS THE CODE FOR HOW GRAPH IS CREATED. graph.java
I have a graph I am drawing in a seperate .java file and it is created like this:
public class graph extends JPanel {
    public static Graphics2D g2;
    final int HPAD = 60, VPAD = 40;
    int[] data;
    Font font;
    public test() {
        data = new int[] {120, 190, 211, 75, 30, 290, 182, 65, 85, 120, 100, 101};
        font = new Font("lucida sans regular", Font.PLAIN, 8);       
        setBackground(Color.white);
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setFont(font);
        FontRenderContext frc = g2.getFontRenderContext();
        int w = getWidth();
        int h = getHeight();
        // scales
        float xInc = (w - HPAD - HPAD) / 10f;
        float yInc = (h - 2*VPAD) / 10f;
        int[] dataVals = getDataVals();
        float yScale = dataVals[2] / 10f;
//        etc... (the rest is just drawing...blah...blah)
}HERE IS THE CODE FOR HOW MY GRAPH IS DISPLAYED AND TRYING TO BE SAVED. results.java
The graph I created is then displayed in a JPanel and there is a button in the results window to save the graph results. This is where I am having difficulty as I am trying to save the g2 from graph.java (declared public static...not sure if this a good idea) but anyway I want to save this as a jpg heres the code:
        resultPanel = new JPanel(new PercentLayout());
        graph drawing = new graph();
        resultPanel.add (
            drawing,
            new PercentLayout.Constraint(1,41,49,50));
        resultPanel.add (
            saveButton1,
            new PercentLayout.Constraint(1,94,25,5));
    public void actionPerformed(ActionEvent e) {
        if(e.getSource() == saveButton1) {
            doSaveGraph();
    public void doSaveGraph() {
        JFileChooser fileSaver;
        fileSaver = new JFileChooser(); // The file-opening dialog
        ExampleFileFilter filter = new ExampleFileFilter("jpg");
        filter.setDescription("JPEG Picture File");
        fileSaver.addChoosableFileFilter(filter);
        try {
            if(fileSaver.showSaveDialog(this) == JFileChooser.APPROVE_OPTION) {
                File f = fileSaver.getSelectedFile();
                BufferedImage img = new BufferedImage(672,600, BufferedImage.TYPE_INT_RGB);
      // SOMEWHERE IN HERE IS WHERE I NEED TO GRAB G2?  I AM NOT SURE WHAT TO DO HERE
                //Graphics g = img.getGraphics();
                //panel.paint(g);
                BufferedOutputStream out = new BufferedOutputStream(new FileOutputStream(f));
                JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
                JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(img);
                param.setQuality(1f, true);
                encoder.setJPEGEncodeParam(param);
                encoder.encode(img);
                System.out.println("It worked");
            else{}
        catch (Exception e) {
            e.printStackTrace();
...If you can help me I will be very happy, and give you 10 dukes! LOL and I appreciate the help!

Answer 1

import java.awt.*;
import java.awt.event.*;
import java.awt.font.*;
import java.awt.geom.*;
import java.awt.image.BufferedImage;
import java.io.*;
import javax.imageio.ImageIO;
import javax.swing.*;
public class SavingGraphics
    public static void main(String[] args)
        GraphicsCreationPanel graphicsPanel = new GraphicsCreationPanel();
        GraphicsSaver saver = new GraphicsSaver(graphicsPanel);
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(saver.getUIPanel(), "North");
        f.getContentPane().add(graphicsPanel);
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
class GraphicsCreationPanel extends JPanel
    String text;
    Font font;
    public GraphicsCreationPanel()
        text = "hello world";
        font = new Font("lucida bright regular", Font.PLAIN, 36);
        setBackground(Color.white);
    protected void paintComponent(Graphics g)
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        int w = getWidth();
        int h = getHeight();
        g2.setPaint(Color.blue);
        g2.draw(new Rectangle2D.Double(w/16, h/16, w*7/8, h*7/8));
        g2.setPaint(Color.orange);
        g2.fill(new Ellipse2D.Double(w/12, h/12, w*5/6, h*5/6));
        g2.setPaint(Color.red);
        g2.fill(new Ellipse2D.Double(w/6, h/6, w*2/3, h*2/3));
        g2.setPaint(Color.black);
        g2.setFont(font);
        FontRenderContext frc = g2.getFontRenderContext();
        LineMetrics lm = font.getLineMetrics(text, frc);
        float textWidth = (float)font.getStringBounds(text, frc).getWidth();
        float x = (w - textWidth)/2;
        float y = (h + lm.getHeight())/2 - lm.getDescent();
        g2.drawString(text, x, y);
class GraphicsSaver
    GraphicsCreationPanel graphicsPanel;
    JFileChooser fileChooser;
    public GraphicsSaver(GraphicsCreationPanel gcp)
        graphicsPanel = gcp;
        fileChooser = new JFileChooser(".");
    private void save()
        if(fileChooser.showSaveDialog(null) == JFileChooser.APPROVE_OPTION)
            File file = fileChooser.getSelectedFile();
            String ext = file.getPath().substring(file.getPath().indexOf(".") + 1);
            BufferedImage image = getImage();
            try
                ImageIO.write(image, ext, file);
            catch(IOException ioe)
                System.out.println("write: " + ioe.getMessage());
    private BufferedImage getImage()
        int w = graphicsPanel.getWidth();
        int h = graphicsPanel.getHeight();
        BufferedImage bi = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2 = bi.createGraphics();
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        graphicsPanel.paint(g2);
        g2.dispose();
        return bi;
    public JPanel getUIPanel()
        JButton save = new JButton("save");
        save.addActionListener(new ActionListener()
            public void actionPerformed(ActionEvent e)
                save();
        JPanel panel = new JPanel();
        panel.add(save);
        return panel;
}