Java tutorial
/* * Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved. * * Redistribution and use in source and binary forms, with or without * 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 Oracle or 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 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * 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); URL page = item.getPage(); if (!page.equals(pageItem.getPage())) { setPage(page); } } } } /** * Load URL into the current page item. If the cached page item exists for * the given URL, use it; otherwise create new page item. */ void setPage(URL url) { PageItem item = pageCache.get(url); if (item == null) { item = createPageItem(url); pageCache.put(url, item); } if (pageItem != null) { Container p = pageItem.getParent(); if (p != null) { p.remove(pageItem); p.add(item); } } pageItem = item; updateSelectedPages(); } /** * Synchronize the selection in the print list with the current page item. * If the current page item isn't in the print list, clear selection. */ void updateSelectedPages() { ListModel pages = selectedPages.getModel(); int n = pages.getSize(); if (n > 0) { URL page = pageItem.getPage(); int index = selectedPages.getSelectedIndex(); if (index >= 0) { PageItem selected = (PageItem) pages.getElementAt(index); if (page.equals(selected.getPage())) { // Currently displayed page is selected in the print list. return; } } for (int i = 0; i < n; i++) { PageItem pi = (PageItem) pages.getElementAt(i); if (page.equals(pi.getPage())) { // Currently displayed page is in the print list, select it. selectedPages.setSelectedIndex(i); return; } } // Currently displayed page is not in the print list. selectedPages.clearSelection(); } } /* Part 3: Initialization and setup. */ /** * Create and return a page item initialized with the given URL. */ PageItem createPageItem(URL url) { PageItem item = new PageItem(); item.setPreferredSize(new Dimension(800, 600)); item.setEditable(false); item.addHyperlinkListener(this); try { item.setPage(url); } catch (IOException ioe) { messageArea.setText("Error loading " + url + ": " + ioe); } return item; } /** * Create and return a menu item with the specified action, mnemonics and * keyboad accelerator. */ JMenuItem createMenuItem(Action action, int mnemonics, KeyStroke accel) { JMenuItem item = new JMenuItem(action); item.setMnemonic(mnemonics); item.setAccelerator(accel); return item; } /** * Create and display the main application frame. */ void createAndShowGUI() { messageArea = new JLabel(defaultMessage); selectedPages = new JList(new DefaultListModel()); selectedPages.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); selectedPages.addListSelectionListener(this); setPage(homePage); JSplitPane pane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, new JScrollPane(pageItem), new JScrollPane(selectedPages)); JMenu fileMenu = new JMenu("File"); fileMenu.setMnemonic(KeyEvent.VK_F); /** Menu item and keyboard shortcuts for the "add page" command. */ fileMenu.add(createMenuItem(new AbstractAction("Add Page") { public void actionPerformed(ActionEvent e) { DefaultListModel pages = (DefaultListModel) selectedPages.getModel(); pages.addElement(pageItem); selectedPages.setSelectedIndex(pages.getSize() - 1); } }, KeyEvent.VK_A, KeyStroke.getKeyStroke(KeyEvent.VK_A, ActionEvent.ALT_MASK))); /** Menu item and keyboard shortcuts for the "print selected" command.*/ fileMenu.add(createMenuItem(new AbstractAction("Print Selected") { public void actionPerformed(ActionEvent e) { printSelectedPages(); } }, KeyEvent.VK_P, KeyStroke.getKeyStroke(KeyEvent.VK_P, ActionEvent.ALT_MASK))); /** Menu item and keyboard shortcuts for the "clear selected" command.*/ fileMenu.add(createMenuItem(new AbstractAction("Clear Selected") { public void actionPerformed(ActionEvent e) { DefaultListModel pages = (DefaultListModel) selectedPages.getModel(); pages.removeAllElements(); } }, KeyEvent.VK_C, KeyStroke.getKeyStroke(KeyEvent.VK_C, ActionEvent.ALT_MASK))); fileMenu.addSeparator(); /** Menu item and keyboard shortcuts for the "home page" command. */ fileMenu.add(createMenuItem(new AbstractAction("Home Page") { public void actionPerformed(ActionEvent e) { setPage(homePage); } }, KeyEvent.VK_H, KeyStroke.getKeyStroke(KeyEvent.VK_H, ActionEvent.ALT_MASK))); /** Menu item and keyboard shortcuts for the "quit" command. */ fileMenu.add(createMenuItem(new AbstractAction("Quit") { public void actionPerformed(ActionEvent e) { for (Window w : Window.getWindows()) { w.dispose(); } } }, KeyEvent.VK_A, KeyStroke.getKeyStroke(KeyEvent.VK_Q, ActionEvent.ALT_MASK))); JMenuBar menuBar = new JMenuBar(); menuBar.add(fileMenu); JPanel contentPane = new JPanel(); contentPane.setLayout(new BoxLayout(contentPane, BoxLayout.Y_AXIS)); contentPane.add(pane); contentPane.add(messageArea); JFrame frame = new JFrame("Text Batch Printing Demo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setJMenuBar(menuBar); frame.setContentPane(contentPane); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); if (printService == null) { // Actual printing is not possible, issue a warning message. JOptionPane.showMessageDialog(frame, "No default print service", "Print Service Alert", JOptionPane.WARNING_MESSAGE); } } public static void main(String[] args) { final TextBatchPrintingDemo demo = new TextBatchPrintingDemo(); demo.homePage = demo.getClass().getResource(defaultPage); // Custom home page can be specified on the command line. if (args.length > 0) { String pageName = args[0]; try { URL url = new URL(pageName); demo.homePage = url; } catch (MalformedURLException e) { System.out.println("Error parsing " + pageName + ": " + e); // Home page is unchanged from the default value. } } //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); demo.createAndShowGUI(); } }); } }