Image Preview In JFileChooser

 Image Preview In JFileChooser

Hello Friends,

Nice to meet you again.

Today we will learn Image Priview In JFileChooser.

here I am giving simple example that will help you to learn to apply Image Priview Facility In JFileChooser.

The output will be:

Now create one class ImagePreviewFileChooser.java and pate the below code in it and run it.

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import java.awt.*;

import java.beans.PropertyChangeEvent;

import java.beans.PropertyChangeListener;

import java.io.*;

import javax.imageio.ImageIO;

import javax.swing.*;

public class ImagePreviewFileChooser extends JPanel implements PropertyChangeListener {

private JFileChooser jfc;

private Image img;

public ImagePreviewFileChooser(JFileChooser jfc) {

this.jfc = jfc;

Dimension sz = new Dimension(200, 200);

setPreferredSize(sz);

}

public void propertyChange(PropertyChangeEvent evt) {

try {

System.out.println("updating");

File file = jfc.getSelectedFile();

updateImage(file);

} catch (IOException ex) {

System.out.println(ex.getMessage());

ex.printStackTrace();

}

}

public void updateImage(File file) throws IOException {

if (file == null) {

return;

}

img = ImageIO.read(file);

repaint();

}

public void paintComponent(Graphics g) {

// fill the background

g.setColor(Color.gray);

g.fillRect(0, 0, getWidth(), getHeight());

if (img != null) {

// calculate the scaling factor

int w = img.getWidth(null);

int h = img.getHeight(null);

int side = Math.max(w, h);

double scale = 200.0 / (double) side;

w = (int) (scale * (double) w);

h = (int) (scale * (double) h);

// draw the image

g.drawImage(img, 0, 0, w, h, null);

// draw the image dimensions

String dim = w + " x " + h;

g.setColor(Color.black);

g.drawString(dim, 31, 196);

g.setColor(Color.white);

g.drawString(dim, 30, 195);

} else {

// print a message

g.setColor(Color.black);

g.drawString("Not an image", 30, 100);

}

}

public static void main(String[] args) {

JFileChooser jfc = new JFileChooser();

ImagePreviewFileChooser preview = new ImagePreviewFileChooser(jfc);

jfc.addPropertyChangeListener(preview);

jfc.setAccessory(preview);

jfc.showOpenDialog(null);

}

}

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Here I am using one Panel in JFilechooser which displays selected Image File.

Every time user selects Image File that Image will be painted on that Panel with paintComponent method.

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Try this code and feel free to ask any dought or give any suggessions.

I always invite your valuable suggessions.

Thank you.

Nirav Raval

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