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public void windowClosing(WindowEvent e) { actionExit(); } }); // Set up File menu. JMenuBar menuBar = new JMenuBar(); JMenu fileMenu = new JMenu("File"); fileMenu.setMnemonic(KeyEvent.VK_F); JMenuItem fileExitMenuItem = new JMenuItem("Exit", KeyEvent.VK_X); fileExitMenuItem.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { actionExit(); } }); fileMenu.add(fileExitMenuItem); menuBar.add(fileMenu); setJMenuBar(menuBar); // Set up button panel. JPanel buttonPanel = new JPanel(); backButton = new JButton("< Back"); backButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { actionBack(); } }); backButton.setEnabled(false); buttonPanel.add(backButton); forwardButton = new JButton("Forward >"); forwardButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { actionForward(); } }); forwardButton.setEnabled(false); buttonPanel.add(forwardButton); locationTextField = new JTextField(35); locationTextField.addKeyListener(new KeyAdapter() { public void keyReleased(KeyEvent e) { if (e.getKeyCode() == KeyEvent.VK_ENTER) { actionGo(); } }
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}); buttonPanel.add(locationTextField); JButton goButton = new JButton("GO"); goButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { actionGo(); } }); buttonPanel.add(goButton); // Set up page display. displayEditorPane = new JEditorPane(); displayEditorPane.setContentType("text/html"); displayEditorPane.setEditable(false); displayEditorPane.addHyperlinkListener(this); getContentPane().setLayout(new BorderLayout()); getContentPane().add(buttonPanel, BorderLayout.NORTH); getContentPane().add(new JScrollPane(displayEditorPane), BorderLayout.CENTER); } // Exit this program. private void actionExit() { System.exit(0); } // Go back to the page viewed before the current page. private void actionBack() { URL currentUrl = displayEditorPane.getPage(); int pageIndex = pageList.indexOf(currentUrl.toString()); try { showPage( new URL((String) pageList.get(pageIndex - 1)), false); } catch (Exception e) {} } // Go forward to the page viewed after the current page. private void actionForward() { URL currentUrl = displayEditorPane.getPage(); int pageIndex = pageList.indexOf(currentUrl.toString()); try { showPage( new URL((String) pageList.get(pageIndex + 1)), false);
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} catch (Exception e) {} } // Load and show the page specified in the location text field. private void actionGo() { URL verifiedUrl = verifyUrl(locationTextField.getText()); if (verifiedUrl != null) { showPage(verifiedUrl, true); } else { showError("Invalid URL"); } } // Show dialog box with error message. private void showError(String errorMessage) { JOptionPane.showMessageDialog(this, errorMessage, "Error", JOptionPane.ERROR_MESSAGE); } // Verify URL format. private URL verifyUrl(String url) { // Only allow HTTP URLs. if (!url.toLowerCase().startsWith("http://")) return null; // Verify format of URL. URL verifiedUrl = null; try { verifiedUrl = new URL(url); } catch (Exception e) { return null; } return verifiedUrl; } /* Show the specified page and add it to the page list if specified. */ private void showPage(URL pageUrl, boolean addToList) { // Show hourglass cursor while crawling is under way. setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR)); try {
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// Get URL of page currently being displayed. URL currentUrl = displayEditorPane.getPage(); // Load and display specified page. displayEditorPane.setPage(pageUrl); // Get URL of new page being displayed. URL newUrl = displayEditorPane.getPage(); // Add page to list if specified. if (addToList) { int listSize = pageList.size(); if (listSize > 0) { int pageIndex = pageList.indexOf(currentUrl.toString()); if (pageIndex < listSize - 1) { for (int i = listSize - 1; i > pageIndex; i--) { pageList.remove(i); } } } pageList.add(newUrl.toString()); } // Update location text field with URL of current page. locationTextField.setText(newUrl.toString()); // Update buttons based on the page being displayed. updateButtons(); } catch (Exception e) { // Show error message. showError("Unable to load page"); } finally { // Return to default cursor. setCursor(Cursor.getDefaultCursor()); } } /* Update Back and Forward buttons based on the page being displayed. */ private void updateButtons() {
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if (pageList.size() < 2) { backButton.setEnabled(false); forwardButton.setEnabled(false); } else { URL currentUrl = displayEditorPane.getPage(); int pageIndex = pageList.indexOf(currentUrl.toString()); backButton.setEnabled(pageIndex > 0); forwardButton.setEnabled( pageIndex < (pageList.size() - 1)); } } // Handle hyperlinks being clicked. public void hyperlinkUpdate(HyperlinkEvent event) { HyperlinkEvent.EventType eventType = event.getEventType(); if (eventType == HyperlinkEvent.EventType.ACTIVATED) { if (event instanceof HTMLFrameHyperlinkEvent) { HTMLFrameHyperlinkEvent linkEvent = (HTMLFrameHyperlinkEvent) event; HTMLDocument document = (HTMLDocument) displayEditorPane.getDocument(); document.processHTMLFrameHyperlinkEvent(linkEvent); } else { showPage(event.getURL(), true); } } } // Run Mini Browser. public static void main(String[] args) { MiniBrowser browser = new MiniBrowser(); browser.show(); } }
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The MiniBrowser Variables
MiniBrowser begins by declaring a few instance variables, most of which hold references to the interface controls. First, the JButton instances that support the Back and Forward buttons are declared. These buttons are used to navigate through the list of pages visited in the browser. Second, locationTextField, which is a reference to a JTextField, is declared. Into this text field the user enters the location (or URL) of pages to be displayed in the browser. Next, displayEditorPane is declared. This is a reference to the JEditorPane instance that will be used to display the Web pages. Finally, pageList is declared. It will refer to the list of pages the browser has visited.
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