FileChooser的简单使用

java 代码

public class SimpleFileChooser extends JFrame {

   public SimpleFileChooser( ) {
    super("File Chooser Test Frame");
    setSize(350, 200);
    setDefaultCloseOperation(EXIT_ON_CLOSE);

    Container c = getContentPane( );
    c.setLayout(new FlowLayout( ));

    JButton openButton = new JButton("Open");
    JButton saveButton = new JButton("Save");
    JButton dirButton = new JButton("Pick Dir");
    final JLabel statusbar =
                 new JLabel("Output of your selection will go here");

    // Create a file chooser that opens up as an Open dialog.
    openButton.addActionListener(new ActionListener( ) {
      public void actionPerformed(ActionEvent ae) {
        JFileChooser chooser = new JFileChooser( );
        chooser.setMultiSelectionEnabled(true);
        int option = chooser.showOpenDialog(SimpleFileChooser.this);
        if (option == JFileChooser.APPROVE_OPTION) {
          File[] sf = chooser.getSelectedFiles( );
          String filelist = "nothing";
          if (sf.length > 0) filelist = sf[0].getName( );
          for (int i = 1; i < sf.length; i++) {
            filelist += ", " + sf[i].getName( );
          }
          statusbar.setText("You chose " + filelist);
        }
        else {
          statusbar.setText("You canceled.");
        }
      }
    });

    // Create a file chooser that opens up as a Save dialog.
    saveButton.addActionListener(new ActionListener( ) {
      public void actionPerformed(ActionEvent ae) {
        JFileChooser chooser = new JFileChooser( );
        int option = chooser.showSaveDialog(SimpleFileChooser.this);
        if (option == JFileChooser.APPROVE_OPTION) {
          statusbar.setText("You saved " + ((chooser.getSelectedFile( )!=null)?
                            chooser.getSelectedFile( ).getName( ):"nothing"));
        }
        else {
          statusbar.setText("You canceled.");
        }
      }
    });

    // Create a file chooser that allows you to pick a directory
    // rather than a file.
    dirButton.addActionListener(new ActionListener( ) {
      public void actionPerformed(ActionEvent ae) {
        JFileChooser chooser = new JFileChooser( );
        chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
        int option = chooser.showOpenDialog(SimpleFileChooser.this);
        if (option == JFileChooser.APPROVE_OPTION) {
          statusbar.setText("You opened " + ((chooser.getSelectedFile( )!=null)?
                            chooser.getSelectedFile( ).getName( ):"nothing"));
        }
        else {
          statusbar.setText("You canceled.");
        }
      }
    });

    c.add(openButton);
    c.add(saveButton);
    c.add(dirButton);
    c.add(statusbar);
  }

  public static void main(String args[]) {
    SimpleFileChooser sfc = new SimpleFileChooser( );
    sfc.setVisible(true);
  }
}