Images in java

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Images in java

how to handle images in java

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September 18, 2012 at 4:27 PM

Here is a simple example of displaying an image on frame.

import java.awt.*;
import java.io.*;
import javax.swing.*;
import java.awt.image.*;
import java.awt.event.*;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;

public class DisplayImage extends JPanel {
BufferedImage image;
DisplayImage(){
String f="c:/fruit.png";
File file = new File(f);
try{
image = ImageIO.read(file);
}
catch(Exception ex){}
repaint();
}
public void paint(Graphics g) {
g.drawImage( image, 0, 0, null);

}
public static void main(String[] args) {
JFrame frame = new JFrame();
JPanel p=new DisplayImage();
frame.add(p);
frame.setSize(300, 300);
frame.setVisible(true);
}
}

September 18, 2012 at 4:30 PM

Here is an example that allow the user to select any image file and display that image on frame.

import java.awt.*;
import java.io.*;
import javax.swing.*;
import java.awt.image.*;
import java.awt.event.*;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;

public class DisplayImage extends JPanel {
BufferedImage image;
Image img;

JButton browse;
File file = null;
public DisplayImage() {

browse = new JButton("Display");
this.add(browse);
browse.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JFileChooser chooser = new JFileChooser();
chooser.addChoosableFileFilter(new ImageFileFilter());
int returnVal = chooser.showOpenDialog(null);

if(returnVal == JFileChooser.APPROVE_OPTION) {
file = chooser.getSelectedFile();
try{
image = ImageIO.read(file);
}
catch(Exception ex){}
repaint();
}
browse.setVisible(false);
}
});
}

public void paint(Graphics g) {
g.drawImage( image, 0, 0, null);

}
public static void main(String[] args) {
JFrame frame = new JFrame("");
JPanel panel = new DisplayImage();
frame.getContentPane().add(panel);
frame.setSize(300, 300);
frame.setVisible(true);
}

}
class ImageFileFilter extends javax.swing.filechooser.FileFilter {
public boolean accept(File file) {
if (file.isDirectory()) return false;
String name = file.getName().toLowerCase();
return (name.endsWith(".jpg") || name.endsWith(".png")|| name.endsWith(".gif"));
}
public String getDescription() { return "Images (*.gif,*.bmp, *.jpg, *.png )"; }
}

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