filesamplepanel.java

The Definitive Guide to Java Swing, Third Edition by John Zukowski (Author) 源码

import java.io.File;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class FileSamplePanel {

  public static void main(String args[]) {
    Runnable runner = new Runnable() {
      public void run() {
        JFrame frame = new JFrame("JFileChooser Popup");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        final JLabel directoryLabel = new JLabel(" ");
        directoryLabel.setFont(new Font("Serif", Font.BOLD | Font.ITALIC, 36));
        frame.add(directoryLabel, BorderLayout.NORTH);

        final JLabel filenameLabel = new JLabel(" ");
        filenameLabel.setFont(new Font("Serif", Font.BOLD | Font.ITALIC, 36));
        frame.add(filenameLabel, BorderLayout.SOUTH);

        JFileChooser fileChooser = new JFileChooser(".");
        fileChooser.setControlButtonsAreShown(false);
        frame.add(fileChooser, BorderLayout.CENTER);

        // Create ActionListener
        ActionListener actionListener = new ActionListener() {
          public void actionPerformed(ActionEvent actionEvent) {
            JFileChooser theFileChooser = (JFileChooser)actionEvent.getSource();
            String command = actionEvent.getActionCommand();
            if (command.equals(JFileChooser.APPROVE_SELECTION)) {
              File selectedFile = theFileChooser.getSelectedFile();
              directoryLabel.setText(selectedFile.getParent());
              filenameLabel.setText(selectedFile.getName());
            } else if (command.equals(JFileChooser.CANCEL_SELECTION)) {
              directoryLabel.setText(" ");
              filenameLabel.setText(" ");
            }
          }
        };
        fileChooser.addActionListener(actionListener);

        frame.pack();
        frame.setVisible(true);
      }
    };
    EventQueue.invokeLater(runner);
  }
}