使用JFileChooser过滤文件类型

Question

I am using JFileChooser to select a file and I am trying to limit the display to show only jpg or jpeg files. I have tried FileFilter and ChoosableFileFilter and it is not limiting the file selection. Here is my code:

JFileChooser chooser = new JFileChooser();
FileFilter filter = new FileNameExtensionFilter("JPEG file", new String[] {"jpg", "jpeg"});
chooser.setFileFilter(filter);
chooser.addChoosableFileFilter(filter);
int returnVal = chooser.showOpenDialog(null);
if(returnVal == JFileChooser.APPROVE_OPTION) {
  debug.put("You chose to open this file: " + chooser.getSelectedFile().getAbsolutePath());
  File selectedFile = new File(chooser.getSelectedFile().getAbsolutePath());
...

Answer 1

Try this:

import javax.swing.JFileChooser;


JFileChooser fileChooser = new JFileChooser();
fileChooser.setFileFilter(new FileFilter() {

   public String getDescription() {
       return "JPG Images (*.jpg)";
   }

   public boolean accept(File f) {
       if (f.isDirectory()) {
           return true;
       } else {
           String filename = f.getName().toLowerCase();
           return filename.endsWith(".jpg") || filename.endsWith(".jpeg") ;
       }
   }
});

Answer 2

尝试使用fileChooser.setFileFilter(filter)而不是fileChooser.addChoosableFileFilter(filter) 。

Answer 3

Try to use fileChooser.setFileFilter(filter) after fileChooser.addChoosableFileFilter(filter) , because you need to add your filter to fileChooser and then setting it as default value.

Here is the link with good example: http://www.java2s.com/Code/Java/Swing-JFC/CustomizingaJFileChooser.htm

Answer 4

Do you mean "it's not limiting the selection" as in "it's allowing the option for any file type"? If so, then try JFileChooser.setAcceptAllFileFilterUsed(boolean) .

chooser.setAcceptAllFileFilterUsed(false);

According to the JFileChooser documentation , it should tell it not to add the all-file-types file filter to the file filter list.

Answer 5

Here is a sample code!

private void btnChangeFileActionPerformed(java.awt.event.ActionEvent evt) {                                              
        final JFileChooser fc = new JFileChooser();
        fc.addChoosableFileFilter(new ArffFilter());
        int returnVal = fc.showOpenDialog(this); 
        ... 
} 

Then

class ArffFilter extends FileFilter {

@Override
public boolean accept(File file) {
    if (file.isDirectory()) {
        return true;
    }
    String fileName = file.getName();
    int i = fileName.lastIndexOf('.');

    if (i > 0 && i < fileName.length() - 1) {
        if (fileName.substring(i + 1).toLowerCase().equals("arff")) {
            return true;
        }
    }

    return false;
}

    @Override
    public String getDescription() {
        return ".arff (Weka format)";
    }
}