Java Web Start: File Chooser Demo Project
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*
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*
* - Redistributions of source code must retain the above copyright
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*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of Sun Microsystems nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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*/
package components;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import javax.swing.*;
import javax.swing.filechooser.*;
import javax.swing.SwingUtilities;
import javax.jnlp.*;
/*
* JWSFileChooserDemo.java must be compiled with jnlp.jar. For
* example, if jnlp.jar is in a subdirectory named jars:
*
* javac -classpath .:jars/jnlp.jar JWSFileChooserDemo.java [UNIX]
* javac -classpath .;jars/jnlp.jar JWSFileChooserDemo.java [Microsoft Windows]
*
* JWSFileChooserDemo.java requires the following files when executing:
* images/Open16.gif
* images/Save16.gif
*/
public class JWSFileChooserDemo extends JPanel
implements ActionListener {
static private final String newline = "\n";
JButton openButton, saveButton;
JTextArea log;
public JWSFileChooserDemo() {
super(new BorderLayout());
//Create the log first, because the action listeners
//need to refer to it.
log = new JTextArea(5,20);
log.setMargin(new Insets(5,5,5,5));
log.setEditable(false);
JScrollPane logScrollPane = new JScrollPane(log);
//Create the open button. We use the image from the JLF
//Graphics Repository (but we extracted it from the jar).
openButton = new JButton("Open a File...",
createImageIcon("images/Open16.gif"));
openButton.addActionListener(this);
//Create the save button. We use the image from the JLF
//Graphics Repository (but we extracted it from the jar).
saveButton = new JButton("Save a File...",
createImageIcon("images/Save16.gif"));
saveButton.addActionListener(this);
//For layout purposes, put the buttons in a separate panel
JPanel buttonPanel = new JPanel();
buttonPanel.add(openButton);
buttonPanel.add(saveButton);
//Add the buttons and the log to this panel.
add(buttonPanel, BorderLayout.PAGE_START);
add(logScrollPane, BorderLayout.CENTER);
}
public void actionPerformed(ActionEvent e) {
//Handle open button action.
if (e.getSource() == openButton) {
FileOpenService fos = null;
FileContents fileContents = null;
try {
fos = (FileOpenService)ServiceManager.
lookup("javax.jnlp.FileOpenService");
} catch (UnavailableServiceException exc) { }
if (fos != null) {
try {
fileContents = fos.openFileDialog(null, null);
} catch (Exception exc) {
log.append("Open command failed: "
+ exc.getLocalizedMessage()
+ newline);
log.setCaretPosition(log.getDocument().getLength());
}
}
if (fileContents != null) {
try {
//This is where a real application would do something
//with the file.
log.append("Opened file: " + fileContents.getName()
+ "." + newline);
} catch (IOException exc) {
log.append("Problem opening file: "
+ exc.getLocalizedMessage()
+ newline);
}
} else {
log.append("User canceled open request." + newline);
}
log.setCaretPosition(log.getDocument().getLength());
}
//Handle save button action.
if (e.getSource() == saveButton) {
FileSaveService fss = null;
FileContents fileContents = null;
ByteArrayInputStream is = new ByteArrayInputStream(
(new String("Saved by JWSFileChooserDemo").getBytes()));
//XXX YIKES! If they select an
//XXX existing file, this will
//XXX overwrite that file.
try {
fss = (FileSaveService)ServiceManager.
lookup("javax.jnlp.FileSaveService");
} catch (UnavailableServiceException exc) { }
if (fss != null) {
try {
fileContents = fss.saveFileDialog(null,
null,
is,
"JWSFileChooserDemo.txt");
} catch (Exception exc) {
log.append("Save command failed: "
+ exc.getLocalizedMessage()
+ newline);
log.setCaretPosition(log.getDocument().getLength());
}
}
if (fileContents != null) {
try {
log.append("Saved file: " + fileContents.getName()
+ "." + newline);
} catch (IOException exc) {
log.append("Problem saving file: "
+ exc.getLocalizedMessage()
+ newline);
}
} else {
log.append("User canceled save request." + newline);
}
log.setCaretPosition(log.getDocument().getLength());
}
}
/** Returns an ImageIcon, or null if the path was invalid. */
protected static ImageIcon createImageIcon(String path) {
java.net.URL imgURL = JWSFileChooserDemo.class.getResource(path);
if (imgURL != null) {
return new ImageIcon(imgURL);
} else {
System.err.println("Couldn't find file: " + path);
return null;
}
}
/**
* Create the GUI and show it. For thread safety,
* this method should be invoked from the
* event dispatch thread.
*/
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("JWSFileChooserDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Add content to the window.
frame.add(new JWSFileChooserDemo());
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event dispatch thread:
//creating and showing this application's GUI.
SwingUtilities.invokeLater(new Runnable() {
public void run() {
//Turn off metal's use of bold fonts
UIManager.put("swing.boldMetal", Boolean.FALSE);
createAndShowGUI();
}
});
}
}
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