import java.io.*;import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.filechooser.*;import javax.jnlp.*;/*  * JWSFileChooserDemo.java is a 1.4 application that must be compiled * with jnlp.jar.  For example, if jnlp.jar is in a subdirectory named jars: *  *   java -classpath .:jars/jnlp.jar JWSFileChooserDemo.java [UNIX] *   java -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"));        //PENDING: removed the Save button action listener        //so that people won't overwrite existing files.        //See bug 4761577.        //saveButton.addActionListener(this);         saveButton.setEnabled(false);        //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;            StringBufferInputStream is = new StringBufferInputStream(                                             "Saved by JWSFileChooserDemo");                                             //XXX deprecated class                                             //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-dispatching thread.     */    private static void createAndShowGUI() {        //Make sure we have nice window decorations.        JFrame.setDefaultLookAndFeelDecorated(true);        //Create and set up the window.        JFrame frame = new JFrame("JWSFileChooserDemo");        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        //Create and set up the content pane.        JComponent newContentPane = new JWSFileChooserDemo();        newContentPane.setOpaque(true); //content panes must be opaque        frame.setContentPane(newContentPane);        //Display the window.        frame.pack();        frame.setVisible(true);    }    public static void main(String[] args) {        //Schedule a job for the event-dispatching thread:        //creating and showing this application's GUI.        javax.swing.SwingUtilities.invokeLater(new Runnable() {            public void run() {                createAndShowGUI();            }        });    }}