Working with File Filters : JFileChooser « Swing « Java Tutorial






Working with File Filters
import java.io.File;

import javax.swing.JFileChooser;
import javax.swing.filechooser.FileFilter;

class ExtensionFileFilter extends FileFilter {
  String description;

  String extensions[];

  public ExtensionFileFilter(String description, String extension) {
    this(description, new String[] { extension });
  }

  public ExtensionFileFilter(String description, String extensions[]) {
    if (description == null) {
      this.description = extensions[0] + "{ " + extensions.length + "} ";
    } else {
      this.description = description;
    }
    this.extensions = (String[]) extensions.clone();
    toLower(this.extensions);
  }

  private void toLower(String array[]) {
    for (int i = 0, n = array.length; i < n; i++) {
      array[i] = array[i].toLowerCase();
    }
  }

  public String getDescription() {
    return description;
  }

  public boolean accept(File file) {
    if (file.isDirectory()) {
      return true;
    } else {
      String path = file.getAbsolutePath().toLowerCase();
      for (int i = 0, n = extensions.length; i < n; i++) {
        String extension = extensions[i];
        if ((path.endsWith(extension) && (path.charAt(path.length() - extension.length() - 1)) == '.')) {
          return true;
        }
      }
    }
    return false;
  }
}

public class JFileChooserWithCustomizedFilter {

  public static void main(String[] a) {
    JFileChooser fileChooser = new JFileChooser(".");
    FileFilter jpegFilter = new ExtensionFileFilter(null, new String[] { "JPG", "JPEG" });

    fileChooser.addChoosableFileFilter(jpegFilter);
    
    fileChooser.showOpenDialog(null);
  }

}








14.77.JFileChooser
14.77.1.JFileChooser
14.77.2.JFileChooser is a standard dialog for selecting a file from the file system.
14.77.3.Getting and Setting the Selected File of a JFileChooser Dialog
14.77.4.Getting and Setting the Current Directory of a JFileChooser Dialog
14.77.5.Determining If the Approve or Cancel Button Was Clicked in a JFileChooser Dialog
14.77.6.Displaying Only Directories in a File Chooser Dialog
14.77.7.Creating a JFileChooser Dialog
14.77.8.Select a directory with a JFileChooser
14.77.9.Disable the JFileChooser 'New folder' button
14.77.10.Listening for Approve and Cancel Events in a JFileChooser Dialog
14.77.11.Using JFileChooserUsing JFileChooser
14.77.12.Working with File FiltersWorking with File Filters
14.77.13.To enable the display of hidden filesTo enable the display of hidden files
14.77.14.The JFileChooser supports three selection modes: files only, directories only, and files and directories
14.77.15.Adding Accessory PanelsAdding Accessory Panels
14.77.16.Custom FileView for Some Java-Related File TypesCustom FileView for Some Java-Related File Types
14.77.17.Using a JFileChooser in Your JFrameUsing a JFileChooser in Your JFrame
14.77.18.ActionListener for JFileChooser in Your JFrameActionListener for JFileChooser in Your JFrame
14.77.19.JFileChooser Selection Option: JFileChooser.APPROVE_OPTION, JFileChooser.CANCEL_OPTIONJFileChooser Selection Option: JFileChooser.APPROVE_OPTION, JFileChooser.CANCEL_OPTION
14.77.20.Adding an ActionListener to a JFileChooser to listen for selection of the approval or cancel actions.Adding an ActionListener to a JFileChooser to listen for selection of the approval or cancel actions.
14.77.21.Listening for Changes to the Selected File in a JFileChooser Dialog
14.77.22.Getting the File-Type Icon of a File
14.77.23.Getting the Large File-Type Icon of a File
14.77.24.Localize a JFileChooser
14.77.25.Determining If a File Is Hidden
14.77.26.Showing Hidden Files in a JFileChooser Dialog
14.77.27.Changing the Text of the Approve Button in a JFileChooser Dialog
14.77.28.Enabling Multiple Selections in a JFileChooser Dialog
14.77.29.Adding a Filter to a File Chooser Dialog
14.77.30.A convenience implementation of FileFilter that filters out all files except for those type extensions that it knows about.
14.77.31.Customizing a JFileChooser Look and Feel
14.77.32.Get Directory Choice
14.77.33.Get File Choice