Image Viewer - Netbeans Java Codes

Run-Shot of Image Viewer displaying sumikuma logo

Java Code:

import java.awt.BorderLayout;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import static javax.swing.JOptionPane.INFORMATION_MESSAGE;
import static javax.swing.JOptionPane.WARNING_MESSAGE;
import static javax.swing.JOptionPane.showMessageDialog;
import javax.swing.JScrollPane;
import javax.swing.KeyStroke;

/**
 *
 * [Find more Netbeans Java Code at www.sumikuma.tk]
 */
public class ImageViewer implements ActionListener {
 private BufferedImage image;
 private JFrame frame;
 private String fileName;
 private JMenuItem menuItem[] = new JMenuItem[2];
 private JLabel area = new JLabel();
 private JScrollPane JSp = new JScrollPane(area,
   JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
 private JFileChooser dialog = new JFileChooser();

 public ImageViewer() {
  if (frame == null) {
   frame = new JFrame();
   JMenuBar menuBar = new JMenuBar();
            JMenu menu = new JMenu("File");
            frame.add(menuBar,BorderLayout.NORTH);
            frame.add(JSp);
            menuBar.add(menu);
            menuItem[0] = new JMenuItem("Open...");
            menuItem[1] = new JMenuItem("Exit");
            menuItem[0].addActionListener(this);
            menuItem[1].addActionListener(this);
            menuItem[1].setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q,
                   Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()));
            menuItem[0].setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,
                                     Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()));
            menu.add(menuItem[0]);
            menu.add(menuItem[1]);
            frame.setJMenuBar(menuBar);
            frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
            frame.setTitle(fileName);
            frame.setResizable(false);
            frame.pack();
            frame.setVisible(true);
  }
  frame.repaint();
 }
 public void readInFile(String fileName) {
  this.fileName = fileName;
  File file = new File(fileName);
  if(file.isFile()) {
            try {
    image = ImageIO.read(file);
   } catch (IOException e) {
    showMessageDialog(frame,"Does not compute !","No file read or found",INFORMATION_MESSAGE);
    e.printStackTrace();
   }
        }
  else {
            URL url = getClass().getResource(fileName);
            if (url == null) { 
             try {
     url = new URL(fileName);
    } catch (MalformedURLException e) {
     showMessageDialog(frame,"Does not compute !","No Image file or found",INFORMATION_MESSAGE);
     e.printStackTrace();
    } 
            }
            try {
    image = ImageIO.read(url);
   } catch (IOException e) {
    showMessageDialog(frame,"Does not compute !","No Image file",WARNING_MESSAGE);
    e.printStackTrace();
   }
       }
}
 public void setImage(JLabel area){
  ImageIcon icon = new ImageIcon(image);
  area.setIcon(icon);
  frame.setSize(icon.getIconWidth(),icon.getIconHeight());
 }
 public void actionPerformed(ActionEvent e) {
  if(e.getSource()==menuItem[0]) {
   if(dialog.showOpenDialog(null)==(JFileChooser.APPROVE_OPTION)) {
     readInFile(dialog.getSelectedFile().getAbsolutePath());
    if(image==null) {
     showMessageDialog(frame,"Does not compute !","No Image file",INFORMATION_MESSAGE);
    }
    else {
     setImage(area);
    }
   }
  }
  else if(e.getSource()==menuItem[1]) {
   System.exit(0);
  }
 }
 public static void main(String[] arg) {
  new ImageViewer();
 }
}

You can also download text file version of this code: Image_Viewer.txt