I have created a program that can change the format of an image. Everything is working, but when I open an image through JFileChooser I am getting java.lang.ClassCastException
. Please can somebody help me. I think I am making a mistake when using the file chooser. I am beginner, please can somebody help me as soon as possible?
package helloWorld;
import java.io.*;
import java.util.TreeSet;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.AffineTransform;
import java.awt.image.*;
import javax.imageio.*;
import javax.swing.*;
import javax.swing.filechooser.FileNameExtensionFilter;
public class SaveImage extends Component implements Action Listener {
String descs[] = {
"Original",
"Convolve : LowPass",
"Convolve : Sharpen",
"LookupOp",
};
int opIndex;
private BufferedImage bi, biFiltered;
private BufferedImage temp;
int w, h;
public static final float[] SHARPEN3x3 = { // sharpening filter kernel
0.f, -1.f, 0.f,
-1.f, 5.f, -1.f,
0.f, -1.f, 0.f
};
public static final float[] BLUR3x3 = {
0.1f, 0.1f, 0.1f, // low-pass filter kernel
0.1f, 0.2f, 0.1f,
0.1f, 0.1f, 0.1f
};
public SaveImage()
{
try {
bi = ImageIO.read(new File("")); // yahan kisi image ka path daal de
w = bi.getWidth(null);
h = bi.getHeight(null);
if (bi.getType() != BufferedImage.TYPE_INT_RGB) {
BufferedImage bi2 =
new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Graphics big = bi2.getGraphics();
big.drawImage(bi, 0, 0, null);
biFiltered = bi = bi2;
}
} catch (IOException e) {
System.out.println("Image could not be read");
System.exit(1);
}
}
public void setimg( String path){}
public Dimension getPreferredSize() {
return new Dimension(w, h);
}
String[] getDescriptions() {
return descs;
}
void setOpIndex(int i) {
opIndex = i;
}
public void paint(Graphics g) {
filterImage();
g.drawImage(biFiltered, 0, 0, null);
}
int lastOp;
public void filterImage() {
BufferedImageOp op = null;
if (opIndex == lastOp) {
return;
}
lastOp = opIndex;
switch (opIndex) {
case 0: biFiltered = bi; /* original */
return;
case 1: /* low pass filter */
case 2: /* sharpen */
float[] data = (opIndex == 1) ? BLUR3x3 : SHARPEN3x3;
op = new ConvolveOp(new Kernel(3, 3, data),
ConvolveOp.EDGE_NO_OP,
null);
break;
case 3 : /* lookup */
byte lut[] = new byte[256];
for (int j=0; j<256; j++) {
lut[j] = (byte)(256-j);
}
ByteLookupTable blut = new ByteLookupTable(0, lut);
op = new LookupOp(blut, null);
break;
}
biFiltered = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
op.filter(bi, biFiltered);
}
/* Return the formats sorted alphabetically and in lower case */
public String[] getFormats() {
String[] formats = ImageIO.getWriterFormatNames();
TreeSet<String> formatSet = new TreeSet<String>();
for (String s : formats) {
formatSet.add(s.toLowerCase());
}
return formatSet.toArray(new String[0]);
}
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand()=="browse")
{
//yahan pe bhundd h browse ka
JFileChooser file = new JFileChooser();
file.setCurrentDirectory(new File(System.getProperty("user.home")));
FileNameExtensionFilter filter = new FileNameExtensionFilter("*.Images","jpg", "gif", "png" );
file.addChoosableFileFilter(filter);
int result = file.showSaveDialog(null);
if (result==JFileChooser.APPROVE_OPTION)
{
File selectedFile = file.getSelectedFile();
String Path = selectedFile.getAbsolutePath();
try{
setimg(Path);// bi = ImageIO.read(new File(Path));
// temp = new BufferedImage(Path);// label.setIcon(ResizeImage(Path));
//}
// catch(IOException e1){
System.out.println("file not found");
//}
}
else if(result== JFileChooser.CANCEL_OPTION)
{
// ImageIcon Mimage = new ImageIcon("C:\Users\Hasnain\Downloads\1.jpg");
System.out.println("No file choosed");
//label.setIcon(Mimage);
}
}
JComboBox cb = (JComboBox)e.getSource();
if (cb.getActionCommand().equals("SetFilter")) {
setOpIndex(cb.getSelectedIndex());
repaint();
} else if (cb.getActionCommand().equals("Formats")) {
/* Save the filtered image in the selected format.
* The selected item will be the name of the format to use
*/
String format = (String)cb.getSelectedItem();
/* Use the format name to initialise the file suffix.
* Format names typically correspond to suffixes
*/
File saveFile = new File("savedimage."+format);
JFileChooser chooser = new JFileChooser();
chooser.setSelectedFile(saveFile);
int rval = chooser.showSaveDialog(cb);
if (rval == JFileChooser.APPROVE_OPTION) {
saveFile = chooser.getSelectedFile();
/* Write the filtered image in the selected format,
* to the file chosen by the user.
*/
try {
ImageIO.write(biFiltered, format, saveFile);
} catch (IOException ex) {
}
}
}
};
public static void main(String s[]) {
JButton button = new JButton("Browse");
button.setBounds(300, 300, 100, 40);
JFrame f = new JFrame("Save Image Sample");
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}
});
SaveImage si = new SaveImage();
f.add("Center", si);
JComboBox choices = new JComboBox(si.getDescriptions());
choices.setActionCommand("SetFilter");
choices.addActionListener(si);
JComboBox formats = new JComboBox(si.getFormats());
formats.setActionCommand("Formats");
formats.addActionListener(si);
JPanel panel = new JPanel();
panel.add(button);
button.setEnabled(true);
panel.add(choices);
panel.add(new JLabel("Save As"));
panel.add(formats);
f.add("South", panel);
f.pack();
f.setVisible(true);
button.addActionListener(si);
button.setActionCommand("browse");
}
}
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