Load, crop and saving jpg and gif images with JFileChooser

Hello!
I wonder is there someone out there who can help me with a applic that load, (crop) and saving images using JFileChooser with a simple GUI as possible. I'm new to programming and i hope someone can show me.
Tor

import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.io.*;
import javax.imageio.ImageIO;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.filechooser.*;
import javax.swing.filechooser.FileFilter;
public class ChopShop extends JPanel {
    JFileChooser fileChooser;
    BufferedImage image;
    Rectangle clip = new Rectangle(50,50,150,150);
    boolean showClip = true;
    public ChopShop() {
        fileChooser = new JFileChooser(".");
        fileChooser.setFileFilter(new ImageFilter());
    public void setClip(int x, int y) {
        clip.setLocation(x, y);
        repaint();
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                            RenderingHints.VALUE_ANTIALIAS_ON);
        if(image != null) {
            int x = (getWidth() - image.getWidth())/2;
            int y = (getHeight() - image.getHeight())/2;
            g2.drawImage(image, x, y, this);
        if(showClip) {
            g2.setPaint(Color.red);
            g2.draw(clip);
    public Dimension getPreferredSize() {
        int width = 400;
        int height = 400;
        int margin = 20;
        if(image != null) {
            width = image.getWidth() + 2*margin;
            height = image.getHeight() + 2*margin;
        return new Dimension(width, height);
    private void showOpenDialog() {
        if(fileChooser.showOpenDialog(this) == JFileChooser.APPROVE_OPTION) {
            File file = fileChooser.getSelectedFile();
            try {
                image = ImageIO.read(file);
            } catch(IOException e) {
                System.out.println("Read error for " + file.getPath() +
                                   ": " + e.getMessage());
                image = null;
            revalidate();
            repaint();
    private void showSaveDialog() {
        if(image == null || !showClip)
            return;
        if(fileChooser.showSaveDialog(this) == JFileChooser.APPROVE_OPTION) {
            File file = fileChooser.getSelectedFile();
            String ext = ((ImageFilter)fileChooser.getFileFilter()).getExtension(file);
            // Make sure we have an ImageWriter for this extension.
            if(!canWriteTo(ext)) {
                System.out.println("Cannot write image to " + ext + " file.");
                String[] formatNames = ImageIO.getWriterFormatNames();
                System.out.println("Supported extensions are:");
                for(int j = 0; j < formatNames.length; j++)
                    System.out.println(formatNames[j]);
                return;
            // If file exists, warn user, confirm overwrite.
            if(file.exists()) {
                String message = "<html>" + file.getPath() + " already exists" +
                                 "<br>Do you want to replace it?";
                int n = JOptionPane.showConfirmDialog(this, message, "Confirm",
                                                      JOptionPane.YES_NO_OPTION);
                if(n != JOptionPane.YES_OPTION)
                    return;
            // Get the clipped image, if available. This is a subImage
            // of image -> they share the same data. Handle with care.
            BufferedImage clipped = getClippedImage();
            if(clipped == null)
                return;
            // Copy the clipped image for safety.
            BufferedImage cropped = copy(clipped);
            boolean success = false;
            // Write cropped to the user-selected file.
            try {
                success = ImageIO.write(cropped, ext, file);
            } catch(IOException e) {
                System.out.println("Write error for " + file.getPath() +
                                   ": " + e.getMessage());
            System.out.println("writing image to " + file.getPath() +
                               " was" + (success ? "" : " not") + " successful");
    private boolean canWriteTo(String ext) {
        // Support for writing gif format is new in j2se 1.6
        String[] formatNames = ImageIO.getWriterFormatNames();
        //System.out.printf("writer formats = %s%n",
        //                   java.util.Arrays.toString(formatNames));
        for(int j = 0; j < formatNames.length; j++) {
            if(formatNames[j].equalsIgnoreCase(ext))
                return true;
        return false;
    private BufferedImage getClippedImage() {
        int w = getWidth();
        int h = getHeight();
        int iw = image.getWidth();
        int ih = image.getHeight();
        // Find origin of centered image.
        int ix = (w - iw)/2;
        int iy = (h - ih)/2;
        // Find clip location relative to image origin.
        int x = clip.x - ix;
        int y = clip.y - iy;
        // clip must be within image bounds to continue.
        if(x < 0 || x + clip.width > iw || y < 0 || y + clip.height > ih) {
            System.out.println("clip is outside image boundries");
            return null;
        BufferedImage subImage = null;
        try {
            subImage = image.getSubimage(x, y, clip.width, clip.height);
        } catch(RasterFormatException e) {
            System.out.println("RFE: " + e.getMessage());
        // Caution: subImage is not independent from image. Changes
        // to one will affect the other. Copying is recommended.
        return subImage;
    private BufferedImage copy(BufferedImage src) {
        int w = src.getWidth();
        int h = src.getHeight();
        BufferedImage dest = new BufferedImage(w, h, src.getType());
        Graphics2D g2 = dest.createGraphics();
        g2.drawImage(src, 0, 0, this);
        g2.dispose();
        return dest;
    private JPanel getControls() {
        JPanel panel = new JPanel(new GridBagLayout());
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.weightx = 1.0;
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.gridwidth = GridBagConstraints.REMAINDER;
        panel.add(getCropPanel(), gbc);
        panel.add(getImagePanel(), gbc);
        return panel;
    private JPanel getCropPanel() {
        JToggleButton toggle = new JToggleButton("clip", showClip);
        toggle.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                showClip = ((AbstractButton)e.getSource()).isSelected();
                repaint();
        SpinnerNumberModel widthModel = new SpinnerNumberModel(150, 10, 400, 1);
        final JSpinner widthSpinner = new JSpinner(widthModel);
        SpinnerNumberModel heightModel = new SpinnerNumberModel(150, 10, 400, 1);
        final JSpinner heightSpinner = new JSpinner(heightModel);
        ChangeListener cl = new ChangeListener() {
            public void stateChanged(ChangeEvent e) {
                JSpinner spinner = (JSpinner)e.getSource();
                int value = ((Number)spinner.getValue()).intValue();
                if(spinner == widthSpinner)
                    clip.width = value;
                if(spinner == heightSpinner)
                    clip.height = value;
                repaint();
        widthSpinner.addChangeListener(cl);
        heightSpinner.addChangeListener(cl);
        JPanel panel = new JPanel(new GridBagLayout());
        GridBagConstraints gbc = new GridBagConstraints();
        gbc.insets = new Insets(2,2,2,2);
        gbc.weightx = 1.0;
        panel.add(toggle, gbc);
        addComponents(new JLabel("width"), widthSpinner, panel, gbc);
        addComponents(new JLabel("height"), heightSpinner, panel, gbc);
        return panel;
    private void addComponents(Component c1, Component c2, Container c,
                               GridBagConstraints gbc) {
        gbc.anchor = GridBagConstraints.EAST;
        c.add(c1, gbc);
        gbc.anchor = GridBagConstraints.WEST;
        c.add(c2, gbc);
    private JPanel getImagePanel() {
        final JButton open = new JButton("open");
        final JButton save = new JButton("save");
        ActionListener al = new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                JButton button = (JButton)e.getSource();
                if(button == open)
                    showOpenDialog();
                if(button == save)
                    showSaveDialog();
        open.addActionListener(al);
        save.addActionListener(al);
        JPanel panel = new JPanel();
        panel.add(open);
        panel.add(save);
        return panel;
    public static void main(String[] args) {
        ChopShop chopShop = new ChopShop();
        ClipMover mover = new ClipMover(chopShop);
        chopShop.addMouseListener(mover);
        chopShop.addMouseMotionListener(mover);
        JFrame f = new JFrame("click inside rectangle to drag");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(new JScrollPane(chopShop));
        f.getContentPane().add(chopShop.getControls(), "Last");
        f.pack();
        f.setLocation(200,100);
        f.setVisible(true);
class ImageFilter extends FileFilter {
    static String GIF = "gif";
    static String JPG = "jpg";
    static String PNG = "png";
    // bmp okay in j2se 1.5+
    public boolean accept(File file) {
        if(file.isDirectory())
            return true;
        String ext = getExtension(file).toLowerCase();
        if(ext.equals(GIF) || ext.equals(JPG) || ext.equals(PNG))
            return true;
        return false;
    public String getDescription() {
        return "gif, jpg, png images";
    public String getExtension(File file) {
        String s = file.getPath();
        int dot = s.lastIndexOf(".");
        return (dot != -1) ? s.substring(dot+1) : "";
class ClipMover extends MouseInputAdapter {
    ChopShop component;
    Point offset = new Point();
    boolean dragging = false;
    public ClipMover(ChopShop cs) {
        component = cs;
    public void mousePressed(MouseEvent e) {
        Point p = e.getPoint();
        if(component.clip.contains(p)) {
            offset.x = p.x - component.clip.x;
            offset.y = p.y - component.clip.y;
            dragging = true;
    public void mouseReleased(MouseEvent e) {
        dragging = false;
    public void mouseDragged(MouseEvent e) {
        if(dragging) {
            int x = e.getX() - offset.x;
            int y = e.getY() - offset.y;
            component.setClip(x, y);
}

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I have 2 things to discuss in this thread.
First to store Images in Database: We can store Images as Binary content in the Database with the Datatype as BLOB. This is possible in ORACLE. I am not sure what the Datatype is in other RDBMS. Please refer to Vendor documentation. After storing, the content can be retrieved and displayed in the pages as image resources using a Servlet. The Servlet will only render the content of the Image.
Second to load Images from User's Systems folder: Why do you have such a requirement? Even then, you need to use any common techniques like Multipart form to upload the specific image file to the Server. Kindly read Oreilley's Multipart Request Form Object example for implementation.
Thanks and regards,
Pazhanikanthan. P

Load, crop and saving jpg and gif images with JFileChooser

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