textbatchprintingdemo.java

java tutorial.sun公司官方出品。java入门书籍。最新版

/*
 * Copyright (c) 1995 - 2008 Sun Microsystems, Inc.  All rights reserved.
 *
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 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - 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
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 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */ 

package misc;

/*
 * TextBatchPrintingDemo.java requires the following files:
 * index.html
 * chapter1.html
 * chapter2.html
 * chapter3.html
 * chapter4.html
 * chapter5.html
 * chapter6.html
 * chapter7.html
 * chapter8.html
 * chapter9.html
 * chapter10.html
 */

import java.awt.Container;
import java.awt.Dimension;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.KeyEvent;
import java.awt.print.PrinterException;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import javax.print.PrintService;
import javax.print.PrintServiceLookup;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.BoxLayout;
import javax.swing.DefaultListModel;
import javax.swing.JEditorPane;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JSplitPane;
import javax.swing.KeyStroke;
import javax.swing.ListModel;
import javax.swing.ListSelectionModel;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkEvent.EventType;
import javax.swing.event.HyperlinkListener;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import javax.swing.text.Document;

/**
 * This is a simple web browser that allows to store visited pages on the 
 * "print list" and then prints all selected pages at once, in batch mode.
 */
public class TextBatchPrintingDemo
                        implements HyperlinkListener, ListSelectionListener {
    
    /**
     * A class representing pages in the page cache and in the print list.
     */
    static class PageItem extends JEditorPane {
        String title;
        
        /**
         * If the loaded document has a title, use it; otherwise use the
         * string representation of the document URL.
         */
        public String toString() {
            if (title == null) {
                String s = (String) getDocument().getProperty(
                                                        Document.TitleProperty);
                title = (s == null ? getPage().toString() : s);
            }
            return title;
        }
    }

    /** Default start page, could be changed from the command line.  */
    static String defaultPage = "index.html";
    
    /** Default message area contents.  */
    static String defaultMessage = "Select: Alt-A  Print: Alt-P  Quit: Alt-Q";
    
    /** Default print service.  */
    static PrintService printService =
                                PrintServiceLookup.lookupDefaultPrintService();
    
    /** The currently displayed page item.  */
    PageItem pageItem;
    
    /** Start page for the page browser.  */
    URL homePage;
    
    /** Cache for the visited page items indexed by page URL.  */
    Map<URL, PageItem> pageCache = new HashMap<URL, PageItem>();
    
    /** Pages currently selected for printing (aka "print list").  */
    JList selectedPages;
    
    /** An area holding the informational and error messages.  */
    JLabel messageArea;


    /**
     * The demo has three logical parts.  The first is the batch printing
     * method, the second is UI controller routines and the third is the UI
     * initialization and other (non-UI) setup code.
     */

    /* Part 1: Batch printing.  */

    /**
     * Print all selected pages in separate threads, one thread per page.
     */
    void printSelectedPages() {
        DefaultListModel pages = (DefaultListModel) selectedPages.getModel();
        int n = pages.getSize();
        if (n < 1) {
            messageArea.setText("No pages selected");
            return;
        }
        if (printService == null) {
            messageArea.setText("No print service");
            return;
        }

        for (int i = 0; i < n; i++) {
            final PageItem item = (PageItem) pages.getElementAt(i);
            // This method is called from EDT.  Printing is a time-consuming
            // task, so it should be done outside EDT, in a separate thread.
            Runnable printTask = new Runnable() {
                public void run() {
                    try {
                        item.print(
                                // Two "false" args mean "no print dialog" and
                                // "non-interactive" (ie, batch-mode printing).
                                null, null, false, printService, null, false);
                    } catch (PrinterException pe) {
                        JOptionPane.showMessageDialog(null,
                                "Error printing " + item.getPage() + "\n" + pe,
                                "Print Error", JOptionPane.WARNING_MESSAGE);
                    }
                }
            };
            new Thread(printTask).start();
        }

        pages.removeAllElements();
        messageArea.setText(n + (n > 1 ? " pages" : " page") + " printed");
    }


    /* Part 2: UI controller.  */

    /**
     * Called when something is happened on a hyperlink in the page browser.
     * This is the {@code HyperlinkListener} method.
     */
    public void hyperlinkUpdate(HyperlinkEvent e) {
        URL url = e.getURL();
        EventType type = e.getEventType();
        
        if (type == EventType.ENTERED) {
            messageArea.setText("Go to " + url);
        } else if (type == EventType.EXITED) {
            messageArea.setText(defaultMessage);
        } else if (type == EventType.ACTIVATED) {
            setPage(url);
            messageArea.setText(defaultMessage);
        }
    }

    /**
     * Called when the print list selection state is changed.  This is the 
     * {@code ListSelectionListener} method.
     */
    public void valueChanged(ListSelectionEvent e) {
        if (!e.getValueIsAdjusting()) {
            int index = ((JList) e.getSource()).getSelectedIndex();
            if (index >= 0) {
                // Load the currently selected URL into the page browser.
                PageItem item =
                        (PageItem) selectedPages.getModel().getElementAt(index);