[allgold36]

Hi, I've been working through some Tutorials in J2SE 5,
using the latest version of NetBeans +updates 5 and SDK, I've been trying to write a simple application to open some jpeg images but when I build and run the project and try to open the image, the GUI remains blank.I understand what the programme does, but how do i get the ImageReader to open my Local file "C:\Images\ and load the Images from that file into the panel.I just can't make it work.Please help....

Thanks for taking the time to review my code:


import java.awt.event.*;
import java.awt.image.*;
import java.io.*;
import java.util.*;
import java.util.List.*;
import javax.imageio.*;
import javax.imageio.stream.*;
import javax.swing.*;

public class UploadImage {
public static void main(String[] args){
JFrame frame = new ImageIOFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);

}
}

/**this frame loads the images*/
class ImageIOFrame extends JFrame
{
public ImageIOFrame()
{
setTitle("UplodedImage");
setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

JMenu fileMenu = new JMenu("File");
JMenuItem openItem = new JMenuItem("Open");
openItem.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
openFile();
}
});
fileMenu.add(openItem);
JMenu saveMenu = new JMenu("Save");
fileMenu.add(saveMenu);
Iterator<String> iter = writerFormats.iterator();
while(iter.hasNext())
{
final String formatName = iter.next();
JMenuItem formatItem = new JMenuItem(formatName);
saveMenu.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
saveFile(formatName);
}
});
}
JMenuItem exitItem = new JMenuItem("Exit");
exitItem.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent event)
{
System.exit(0);

}
});

fileMenu.add(exitItem);

JMenuBar menuBar = new JMenuBar();
menuBar.add(fileMenu);
setJMenuBar(menuBar);
}
/**open file and load the images
*/
public void openFile()
{
JFileChooser chooser = new JFileChooser();
chooser.setCurrentDirectory(new File("."));
chooser.setFileFilter(new javax.swing.filechooser.FileFilter()
{
public boolean accept(File f)
{
if(f.isDirectory()) return true;
String name = f.getName();
int p = name.lastIndexOf('.');
if(p == -1) return false;
String suffix = name.substring(p+1).toLowerCase();
return readerSuffixes.contains(suffix);
}
public String getDescription()
{
return "image files";

}
});
int r = chooser.showOpenDialog(this);
if(r != JFileChooser.APPROVE_OPTION) return;
File f = chooser.getSelectedFile();
Box box = Box.createVerticalBox();
try
{

Iterator<ImageReader> iter = ImageIO.getImageReadersByFormatName("JPEG");
ImageReader reader = iter.next();
int count = reader.getNumImages(true);
images = new BufferedImage[count];
for (int i = 0; i < count; i++)
{
images[i] = reader.read(i);
box.add(new JLabel(new ImageIcon(images[i])));

}
}

catch (IOException e)
{
JOptionPane.showMessageDialog(this, e);

}
setContentPane(new JScrollPane(box));
validate();
}
/** save current image in file*/

public void saveFile(final String formatName)
{
if(images == null) return;
Iterator<ImageWriter> iter = ImageIO.getImageWritersByFormatName(formatName);
ImageWriter writer = iter.next();
final java.util.List<String> writerSuffixes
= Arrays.asList(writer.getOriginatingProvider().getFileSuffixes());
JFileChooser chooser = new JFileChooser();
chooser.setCurrentDirectory(new File("."));

chooser.setFileFilter(new
javax.swing.filechooser.FileFilter()
{
public boolean accept(File f)
{
if (f.isDirectory()) return true;
String name = f.getName();
int p = name.lastIndexOf('.');
if(p == -1) return false;
String suffix = name.substring(p + 1).toLowerCase();
return writerSuffixes.contains(suffix);

}
public String getDescription()
{
return formatName + "files";
}
});
int r = chooser.showSaveDialog(this);
if (r != JFileChooser.APPROVE_OPTION) return;
File f = chooser.getSelectedFile();
try
{
ImageOutputStream imageOut = ImageIO.createImageOutputStream(f);
writer.setOutput(imageOut);
writer.write(new IIOImage(images[0], null, null));
for (int i =1; i < images.length; i++)
{
IIOImage iioImage = new IIOImage(images[i], null, null);
if(writer.canInsertImage(i))
writer.writeInsert(i, iioImage, null);
}
}
catch (IOException e)
{
JOptionPane.showMessageDialog(this, e);
}
}
/**get a set of all files suffiexs that are recognised by reader*/

public static Set<String> getReaderSuffixes()
{
TreeSet<String> readerSuffixes = new TreeSet<String>();
for(String name : ImageIO.getReaderFormatNames())
{
Iterator<ImageReader> iter = ImageIO.getImageReadersByFormatName("JPEG");
while(iter.hasNext())
{
ImageReader reader = iter.next();
String[] s = reader.getOriginatingProvider().getFileSuffixes();
readerSuffixes.addAll(Arrays.asList(s));

}
}
return readerSuffixes;

}
/** get set of preffered format name for all image writers*/

public static Set<String> getWriterFormats()

{
TreeSet<String> writerFormats = new TreeSet<String>();
TreeSet<String> formatNames
= new TreeSet<String>(Arrays.asList(ImageIO.getWriterFormatNames()));

while (formatNames.size() > 0)
{
String name = formatNames.iterator().next();
Iterator<ImageWriter> iter = ImageIO.getImageWritersByFormatName(name);
ImageWriter writer = iter.next();
String[] names = writer.getOriginatingProvider().getFormatNames();
writerFormats.add(names[0]);
formatNames.removeAll(Arrays.asList(names));

}
return writerFormats;

}
private BufferedImage[] images;
private static Set<String> readerSuffixes = getReaderSuffixes();
private static Set<String> writerFormats = getWriterFormats();
private static final int DEFAULT_WIDTH = 400;
private static final int DEFAULT_HEIGHT = 400;
}