HI
Maybe you can reload JFileChooser's approveSelection() method.and check whether
file exits and popup a alert dialog.the following is a simple sample:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
public class test extends JApplet{
JFileChooser chooser=new file();
public void init(){
JButton button=new JButton("SAVE");
JDialog dialog;
getContentPane().add(button,BorderLayout.CENTER);
button.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
chooser.showSaveDialog(null);
}
});
}
public static void main(String[] args){
JFrame f=new JFrame();
JApplet applet=new test();
applet.init();
f.setContentPane(applet.getContentPane());
f.setBounds(100,100,500,500);
f.setVisible(true);
}
}
class file extends JFileChooser{
public void approveSelection() {
File tt=getSelectedFile();
if(tt.exists()){
JOptionPane.showMessageDialog(null,"File exists!");
return;
}
super.approveSelection();
}
}
Good Luck
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