Java tutorial
/* This program is a part of the companion code for Core Java 8th ed. (http://horstmann.com/corejava) This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ import java.awt.Desktop; import java.awt.EventQueue; import java.awt.FlowLayout; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.Insets; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.net.URI; import java.net.URISyntaxException; import java.net.URLEncoder; import javax.swing.JButton; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JTextField; /** * This program demonstrates the desktop app API. * * @version 1.00 2007-09-22 * @author Cay Horstmann */ public class DesktopAppTest { public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { JFrame frame = new DesktopAppFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); } }); } } class DesktopAppFrame extends JFrame { public DesktopAppFrame() { setLayout(new GridBagLayout()); final JFileChooser chooser = new JFileChooser(); JButton fileChooserButton = new JButton("..."); final JTextField fileField = new JTextField(20); fileField.setEditable(false); JButton openButton = new JButton("Open"); JButton editButton = new JButton("Edit"); JButton printButton = new JButton("Print"); final JTextField browseField = new JTextField(); JButton browseButton = new JButton("Browse"); final JTextField toField = new JTextField(); final JTextField subjectField = new JTextField(); JButton mailButton = new JButton("Mail"); openButton.setEnabled(false); editButton.setEnabled(false); printButton.setEnabled(false); browseButton.setEnabled(false); mailButton.setEnabled(false); if (Desktop.isDesktopSupported()) { Desktop desktop = Desktop.getDesktop(); if (desktop.isSupported(Desktop.Action.OPEN)) openButton.setEnabled(true); if (desktop.isSupported(Desktop.Action.EDIT)) editButton.setEnabled(true); if (desktop.isSupported(Desktop.Action.PRINT)) printButton.setEnabled(true); if (desktop.isSupported(Desktop.Action.BROWSE)) browseButton.setEnabled(true); if (desktop.isSupported(Desktop.Action.MAIL)) mailButton.setEnabled(true); } fileChooserButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { if (chooser.showOpenDialog(DesktopAppFrame.this) == JFileChooser.APPROVE_OPTION) fileField.setText(chooser.getSelectedFile().getAbsolutePath()); } }); openButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { try { Desktop.getDesktop().open(chooser.getSelectedFile()); } catch (IOException ex) { ex.printStackTrace(); } } }); editButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { try { Desktop.getDesktop().edit(chooser.getSelectedFile()); } catch (IOException ex) { ex.printStackTrace(); } } }); printButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { try { Desktop.getDesktop().print(chooser.getSelectedFile()); } catch (IOException ex) { ex.printStackTrace(); } } }); browseButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { try { Desktop.getDesktop().browse(new URI(browseField.getText())); } catch (URISyntaxException ex) { ex.printStackTrace(); } catch (IOException ex) { ex.printStackTrace(); } } }); mailButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { try { String subject = percentEncode(subjectField.getText()); URI uri = new URI("mailto:" + toField.getText() + "?subject=" + subject); System.out.println(uri); Desktop.getDesktop().mail(uri); } catch (URISyntaxException ex) { ex.printStackTrace(); } catch (IOException ex) { ex.printStackTrace(); } } }); JPanel buttonPanel = new JPanel(); ((FlowLayout) buttonPanel.getLayout()).setHgap(2); buttonPanel.add(openButton); buttonPanel.add(editButton); buttonPanel.add(printButton); add(fileChooserButton, new GBC(0, 0).setAnchor(GBC.EAST).setInsets(2)); add(fileField, new GBC(1, 0).setFill(GBC.HORIZONTAL)); add(buttonPanel, new GBC(2, 0).setAnchor(GBC.WEST).setInsets(0)); add(browseField, new GBC(1, 1).setFill(GBC.HORIZONTAL)); add(browseButton, new GBC(2, 1).setAnchor(GBC.WEST).setInsets(2)); add(new JLabel("To:"), new GBC(0, 2).setAnchor(GBC.EAST).setInsets(5, 2, 5, 2)); add(toField, new GBC(1, 2).setFill(GBC.HORIZONTAL)); add(mailButton, new GBC(2, 2).setAnchor(GBC.WEST).setInsets(2)); add(new JLabel("Subject:"), new GBC(0, 3).setAnchor(GBC.EAST).setInsets(5, 2, 5, 2)); add(subjectField, new GBC(1, 3).setFill(GBC.HORIZONTAL)); pack(); } private static String percentEncode(String s) { try { return URLEncoder.encode(s, "UTF-8").replaceAll("[+]", "%20"); } catch (UnsupportedEncodingException ex) { return null; // UTF-8 is always supported } } } /* * This program is a part of the companion code for Core Java 8th ed. * (http://horstmann.com/corejava) * * This program is free software: you can redistribute it and/or modify it under * the terms of the GNU General Public License as published by the Free Software * Foundation, either version 3 of the License, or (at your option) any later * version. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more * details. * * You should have received a copy of the GNU General Public License along with * this program. If not, see <http://www.gnu.org/licenses/>. */ /* * GBC - A convenience class to tame the GridBagLayout * * Copyright (C) 2002 Cay S. Horstmann (http://horstmann.com) * * This program is free software; you can redistribute it and/or modify it under * the terms of the GNU General Public License as published by the Free Software * Foundation; either version 2 of the License, or (at your option) any later * version. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more * details. * * You should have received a copy of the GNU General Public License along with * this program; if not, write to the Free Software Foundation, Inc., 59 Temple * Place, Suite 330, Boston, MA 02111-1307 USA */ /** * This class simplifies the use of the GridBagConstraints class. */ class GBC extends GridBagConstraints { /** * Constructs a GBC with a given gridx and gridy position and all other grid * bag constraint values set to the default. * * @param gridx * the gridx position * @param gridy * the gridy position */ public GBC(int gridx, int gridy) { this.gridx = gridx; this.gridy = gridy; } /** * Constructs a GBC with given gridx, gridy, gridwidth, gridheight and all * other grid bag constraint values set to the default. * * @param gridx * the gridx position * @param gridy * the gridy position * @param gridwidth * the cell span in x-direction * @param gridheight * the cell span in y-direction */ public GBC(int gridx, int gridy, int gridwidth, int gridheight) { this.gridx = gridx; this.gridy = gridy; this.gridwidth = gridwidth; this.gridheight = gridheight; } /** * Sets the anchor. * * @param anchor * the anchor value * @return this object for further modification */ public GBC setAnchor(int anchor) { this.anchor = anchor; return this; } /** * Sets the fill direction. * * @param fill * the fill direction * @return this object for further modification */ public GBC setFill(int fill) { this.fill = fill; return this; } /** * Sets the cell weights. * * @param weightx * the cell weight in x-direction * @param weighty * the cell weight in y-direction * @return this object for further modification */ public GBC setWeight(double weightx, double weighty) { this.weightx = weightx; this.weighty = weighty; return this; } /** * Sets the insets of this cell. * * @param distance * the spacing to use in all directions * @return this object for further modification */ public GBC setInsets(int distance) { this.insets = new Insets(distance, distance, distance, distance); return this; } /** * Sets the insets of this cell. * * @param top * the spacing to use on top * @param left * the spacing to use to the left * @param bottom * the spacing to use on the bottom * @param right * the spacing to use to the right * @return this object for further modification */ public GBC setInsets(int top, int left, int bottom, int right) { this.insets = new Insets(top, left, bottom, right); return this; } /** * Sets the internal padding * * @param ipadx * the internal padding in x-direction * @param ipady * the internal padding in y-direction * @return this object for further modification */ public GBC setIpad(int ipadx, int ipady) { this.ipadx = ipadx; this.ipady = ipady; return this; } }