Java/Tiny Application/Browser
Содержание
Brower based on JEditorPane
<source lang="java">
import java.awt.BorderLayout; import java.awt.Cursor; import java.awt.Dimension; import java.awt.Graphics; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyAdapter; import java.awt.event.KeyEvent; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import java.awt.event.WindowListener; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.ObjectInput; import java.io.ObjectInputStream; import java.io.ObjectOutput; import java.io.ObjectOutputStream; import java.net.URL; import javax.swing.Box; import javax.swing.BoxLayout; import javax.swing.ruboBoxModel; import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.JComboBox; import javax.swing.JEditorPane; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTextField; import javax.swing.event.HyperlinkEvent; import javax.swing.event.HyperlinkListener; public class Browser extends JFrame {
protected JEditorPane m_browser;
protected MemComboBox m_locator = new MemComboBox();
public Browser() {
super("HTML Browser");
setSize(500, 300);
getContentPane().setLayout(new BorderLayout());
JPanel p = new JPanel();
p.setLayout(new BoxLayout(p, BoxLayout.X_AXIS));
p.add(new JLabel("Address"));
m_locator.load("addresses.dat");
BrowserListener lst = new BrowserListener();
m_locator.addActionListener(lst);
MemComboAgent agent = new MemComboAgent(m_locator);
p.add(m_locator);
getContentPane().add(p, BorderLayout.NORTH);
m_browser = new JEditorPane();
m_browser.setEditable(false);
m_browser.addHyperlinkListener(lst);
JScrollPane sp = new JScrollPane();
sp.getViewport().add(m_browser);
getContentPane().add(sp, BorderLayout.CENTER);
WindowListener wndCloser = new WindowAdapter() {
public void windowClosing(WindowEvent e) {
m_locator.save("addresses.dat");
System.exit(0);
}
};
addWindowListener(wndCloser);
setVisible(true);
m_locator.grabFocus();
}
class BrowserListener implements ActionListener, HyperlinkListener {
public void actionPerformed(ActionEvent evt) {
String sUrl = (String) m_locator.getSelectedItem();
if (sUrl == null || sUrl.length() == 0 )
return;
BrowserLoader loader = new BrowserLoader(sUrl);
loader.start();
}
public void hyperlinkUpdate(HyperlinkEvent e) {
URL url = e.getURL();
if (url == null )
return;
BrowserLoader loader = new BrowserLoader(url.toString());
loader.start();
}
}
class BrowserLoader extends Thread {
protected String m_sUrl;
public BrowserLoader(String sUrl) {
m_sUrl = sUrl;
}
public void run() {
setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
try {
URL source = new URL(m_sUrl);
m_browser.setPage(source);
m_locator.add(m_sUrl);
} catch (Exception e) {
JOptionPane.showMessageDialog(Browser.this, "Error: "
+ e.toString(), "Warning", JOptionPane.WARNING_MESSAGE);
}
setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
}
}
public static void main(String argv[]) {
new Browser();
}
} class MemComboAgent extends KeyAdapter {
protected JComboBox m_comboBox;
protected JTextField m_editor;
public MemComboAgent(JComboBox comboBox) {
m_comboBox = comboBox;
m_editor = (JTextField) comboBox.getEditor().getEditorComponent();
m_editor.addKeyListener(this);
}
public void keyReleased(KeyEvent e) {
char ch = e.getKeyChar();
if (ch == KeyEvent.CHAR_UNDEFINED || Character.isISOControl(ch))
return;
int pos = m_editor.getCaretPosition();
String str = m_editor.getText();
if (str.length() == 0)
return;
for (int k = 0; k < m_comboBox.getItemCount(); k++) {
String item = m_comboBox.getItemAt(k).toString();
if (item.startsWith(str)) {
m_editor.setText(item);
m_editor.setCaretPosition(item.length());
m_editor.moveCaretPosition(pos);
break;
}
}
}
} class MemComboBox extends JComboBox {
public static final int MAX_MEM_LEN = 30;
public MemComboBox() {
super();
setEditable(true);
}
public void add(String item) {
removeItem(item);
insertItemAt(item, 0);
setSelectedItem(item);
if (getItemCount() > MAX_MEM_LEN)
removeItemAt(getItemCount() - 1);
}
public void load(String fName) {
try {
if (getItemCount() > 0)
removeAllItems();
File f = new File(fName);
if (!f.exists())
return;
FileInputStream fStream = new FileInputStream(f);
ObjectInput stream = new ObjectInputStream(fStream);
Object obj = stream.readObject();
if (obj instanceof ComboBoxModel)
setModel((ComboBoxModel) obj);
stream.close();
fStream.close();
} catch (Exception e) {
System.err.println("Serialization error: " + e.toString());
}
}
public void save(String fName) {
try {
FileOutputStream fStream = new FileOutputStream(fName);
ObjectOutput stream = new ObjectOutputStream(fStream);
stream.writeObject(getModel());
stream.flush();
stream.close();
fStream.close();
} catch (Exception e) {
System.err.println("Serialization error: " + e.toString());
}
}
}
</source>
Drag and drop web browser
<source lang="java">
import java.awt.BorderLayout; import java.awt.Container; import java.awt.datatransfer.DataFlavor; import java.awt.datatransfer.Transferable; import java.awt.datatransfer.UnsupportedFlavorException; import java.awt.dnd.DnDConstants; import java.awt.dnd.DropTarget; import java.awt.dnd.DropTargetDragEvent; import java.awt.dnd.DropTargetDropEvent; import java.awt.dnd.DropTargetEvent; import java.awt.dnd.DropTargetListener; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.File; import java.io.IOException; import java.net.MalformedURLException; import java.net.URL; import java.util.ArrayList; import java.util.Iterator; import java.util.List; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JEditorPane; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTextField; import javax.swing.JToolBar; import javax.swing.event.HyperlinkEvent; import javax.swing.event.HyperlinkListener; public class DnDWebBrowser extends JFrame {
private WebToolBar toolBar;
private WebBrowserPane browserPane = new WebBrowserPane();
public DnDWebBrowser() {
super("Drag-and-Drop Web Browser");
toolBar = new WebToolBar(browserPane);
browserPane.setDropTarget(new DropTarget(browserPane, DnDConstants.ACTION_COPY,
new DropTargetHandler()));
Container contentPane = getContentPane();
contentPane.add(toolBar, BorderLayout.NORTH);
contentPane.add(new JScrollPane(browserPane), BorderLayout.CENTER);
}
private class DropTargetHandler implements DropTargetListener {
public void drop(DropTargetDropEvent event) {
Transferable transferable = event.getTransferable();
if (transferable.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
event.acceptDrop(DnDConstants.ACTION_COPY);
try {
List fileList = (List) transferable.getTransferData(DataFlavor.javaFileListFlavor);
Iterator iterator = fileList.iterator();
while (iterator.hasNext()) {
File file = (File) iterator.next();
browserPane.goToURL(file.toURL());
}
event.dropComplete(true);
} catch (UnsupportedFlavorException flavorException) {
flavorException.printStackTrace();
event.dropComplete(false);
} catch (IOException ioException) {
ioException.printStackTrace();
event.dropComplete(false);
}
} else {
event.rejectDrop();
}
}
public void dragEnter(DropTargetDragEvent event) {
if (event.isDataFlavorSupported(DataFlavor.javaFileListFlavor))
event.acceptDrag(DnDConstants.ACTION_COPY);
else {
event.rejectDrag();
}
}
public void dragExit(DropTargetEvent event) {
}
public void dragOver(DropTargetDragEvent event) {
}
public void dropActionChanged(DropTargetDragEvent event) {
}
}
public static void main(String args[]) {
DnDWebBrowser browser = new DnDWebBrowser();
browser.setDefaultCloseOperation(EXIT_ON_CLOSE);
browser.setSize(640, 480);
browser.setVisible(true);
}
} class WebBrowserPane extends JEditorPane {
private List history = new ArrayList();
private int historyIndex;
public WebBrowserPane() {
setEditable(false);
}
public void goToURL(URL url) {
displayPage(url);
history.add(url);
historyIndex = history.size() - 1;
}
public URL forward() {
historyIndex++;
if (historyIndex >= history.size())
historyIndex = history.size() - 1;
URL url = (URL) history.get(historyIndex);
displayPage(url);
return url;
}
public URL back() {
historyIndex--;
if (historyIndex < 0)
historyIndex = 0;
URL url = (URL) history.get(historyIndex);
displayPage(url);
return url;
}
private void displayPage(URL pageURL) {
try {
setPage(pageURL);
} catch (IOException ioException) {
ioException.printStackTrace();
}
}
} class WebToolBar extends JToolBar implements HyperlinkListener {
private WebBrowserPane webBrowserPane;
private JButton backButton;
private JButton forwardButton;
private JTextField urlTextField;
public WebToolBar(WebBrowserPane browser) {
super("Web Navigation");
webBrowserPane = browser;
webBrowserPane.addHyperlinkListener(this);
urlTextField = new JTextField(25);
urlTextField.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
try {
URL url = new URL(urlTextField.getText());
webBrowserPane.goToURL(url);
} catch (MalformedURLException urlException) {
urlException.printStackTrace();
}
}
});
backButton = new JButton("back");
backButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
URL url = webBrowserPane.back();
urlTextField.setText(url.toString());
}
});
forwardButton = new JButton("forward");
forwardButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
URL url = webBrowserPane.forward();
urlTextField.setText(url.toString());
}
});
add(backButton);
add(forwardButton);
add(urlTextField);
}
public void hyperlinkUpdate(HyperlinkEvent event) {
if (event.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
URL url = event.getURL();
webBrowserPane.goToURL(url);
urlTextField.setText(url.toString());
}
}
}
</source>
MDI based web browser
<source lang="java">
import java.awt.BorderLayout; import java.awt.Container; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.IOException; import java.net.MalformedURLException; import java.net.URL; import java.util.ArrayList; import java.util.List; import javax.swing.AbstractAction; import javax.swing.Action; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JDesktopPane; import javax.swing.JEditorPane; import javax.swing.JFrame; import javax.swing.JInternalFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JScrollPane; import javax.swing.JTextField; import javax.swing.JToolBar; import javax.swing.event.HyperlinkEvent; import javax.swing.event.HyperlinkListener; public class MDIWebBrowser extends JFrame {
JDesktopPane desktopPane = new JDesktopPane();
public MDIWebBrowser() {
super("MDI Web Browser");
createNewWindow();
Container contentPane = getContentPane();
contentPane.add(desktopPane);
JMenu fileMenu = new JMenu("File");
fileMenu.add(new NewWindowAction());
fileMenu.addSeparator();
fileMenu.add(new ExitAction());
fileMenu.setMnemonic("F");
JMenuBar menuBar = new JMenuBar();
menuBar.add(fileMenu);
setJMenuBar(menuBar);
}
private void createNewWindow() {
JInternalFrame frame = new JInternalFrame("Browser", // title
true, // resizable
true, // closable
true, // maximizable
true); // iconifiable
WebBrowserPane browserPane = new WebBrowserPane();
WebToolBar toolBar = new WebToolBar(browserPane);
Container contentPane = frame.getContentPane();
contentPane.add(toolBar, BorderLayout.NORTH);
contentPane.add(new JScrollPane(browserPane), BorderLayout.CENTER);
frame.setSize(320, 240);
// move JInternalFrame to prevent it from obscuring others
int offset = 30 * desktopPane.getAllFrames().length;
frame.setLocation(offset, offset);
desktopPane.add(frame);
frame.setVisible(true);
}
private class NewWindowAction extends AbstractAction {
public NewWindowAction() {
putValue(Action.NAME, "New Window");
putValue(Action.SHORT_DESCRIPTION, "Create New Web Browser Window");
putValue(Action.MNEMONIC_KEY, new Integer("N"));
}
public void actionPerformed(ActionEvent event) {
createNewWindow();
}
}
private class ExitAction extends AbstractAction {
public ExitAction() {
// set name, description and mnemonic key
putValue(Action.NAME, "Exit");
putValue(Action.SHORT_DESCRIPTION, "Exit Application");
putValue(Action.MNEMONIC_KEY, new Integer("x"));
}
public void actionPerformed(ActionEvent event) {
System.exit(0);
}
}
public static void main(String args[]) {
MDIWebBrowser browser = new MDIWebBrowser();
browser.setDefaultCloseOperation(EXIT_ON_CLOSE);
browser.setSize(640, 480);
browser.setVisible(true);
}
} class WebToolBar extends JToolBar implements HyperlinkListener {
private WebBrowserPane webBrowserPane;
private JButton backButton;
private JButton forwardButton;
private JTextField urlTextField;
public WebToolBar(WebBrowserPane browser) {
super("Web Navigation");
webBrowserPane = browser;
webBrowserPane.addHyperlinkListener(this);
urlTextField = new JTextField(25);
urlTextField.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
try {
URL url = new URL(urlTextField.getText());
webBrowserPane.goToURL(url);
}catch (MalformedURLException urlException) {
urlException.printStackTrace();
}
}
});
backButton = new JButton("back");
backButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
URL url = webBrowserPane.back();
urlTextField.setText(url.toString());
}
});
forwardButton = new JButton("forward");
forwardButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
URL url = webBrowserPane.forward();
urlTextField.setText(url.toString());
}
});
add(backButton);
add(forwardButton);
add(urlTextField);
}
public void hyperlinkUpdate(HyperlinkEvent event) {
if (event.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
URL url = event.getURL();
webBrowserPane.goToURL(url);
urlTextField.setText(url.toString());
}
}
} class WebBrowserPane extends JEditorPane {
private List history = new ArrayList();
private int historyIndex;
public WebBrowserPane() {
setEditable(false);
}
public void goToURL(URL url) {
displayPage(url);
history.add(url);
historyIndex = history.size() - 1;
}
public URL forward() {
historyIndex++;
if (historyIndex >= history.size())
historyIndex = history.size() - 1;
URL url = (URL) history.get(historyIndex);
displayPage(url);
return url;
}
public URL back() {
historyIndex--;
if (historyIndex < 0)
historyIndex = 0;
URL url = (URL) history.get(historyIndex);
displayPage(url);
return url;
}
private void displayPage(URL pageURL) {
try {
setPage(pageURL);
}
catch (IOException ioException) {
ioException.printStackTrace();
}
}
}
</source>
Tabbed Web browser
<source lang="java">
import java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.IOException; import java.net.MalformedURLException; import java.net.URL; import java.util.ArrayList; import java.util.List; import javax.swing.AbstractAction; import javax.swing.Action; import javax.swing.JButton; import javax.swing.JEditorPane; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTabbedPane; import javax.swing.JTextField; import javax.swing.JToolBar; import javax.swing.event.HyperlinkEvent; import javax.swing.event.HyperlinkListener; public class TabbedPaneWebBrowser extends JFrame {
private JTabbedPane tabbedPane = new JTabbedPane();
public TabbedPaneWebBrowser() {
super("JTabbedPane Web Browser");
createNewTab();
getContentPane().add(tabbedPane);
JMenu fileMenu = new JMenu("File");
fileMenu.add(new NewTabAction());
fileMenu.addSeparator();
fileMenu.add(new ExitAction());
fileMenu.setMnemonic("F");
JMenuBar menuBar = new JMenuBar();
menuBar.add(fileMenu);
setJMenuBar(menuBar);
}
private void createNewTab() {
JPanel panel = new JPanel(new BorderLayout());
WebBrowserPane browserPane = new WebBrowserPane();
WebToolBar toolBar = new WebToolBar(browserPane);
panel.add(toolBar, BorderLayout.NORTH);
panel.add(new JScrollPane(browserPane), BorderLayout.CENTER);
tabbedPane.addTab("Browser " + tabbedPane.getTabCount(), panel);
}
private class NewTabAction extends AbstractAction {
public NewTabAction() {
putValue(Action.NAME, "New Browser Tab");
putValue(Action.SHORT_DESCRIPTION, "Create New Web Browser Tab");
putValue(Action.MNEMONIC_KEY, new Integer("N"));
}
public void actionPerformed(ActionEvent event) {
createNewTab();
}
}
private class ExitAction extends AbstractAction {
public ExitAction() {
putValue(Action.NAME, "Exit");
putValue(Action.SHORT_DESCRIPTION, "Exit Application");
putValue(Action.MNEMONIC_KEY, new Integer("x"));
}
public void actionPerformed(ActionEvent event) {
System.exit(0);
}
}
public static void main(String args[]) {
TabbedPaneWebBrowser browser = new TabbedPaneWebBrowser();
browser.setDefaultCloseOperation(EXIT_ON_CLOSE);
browser.setSize(640, 480);
browser.setVisible(true);
}
} class WebBrowserPane extends JEditorPane {
private List history = new ArrayList();
private int historyIndex;
public WebBrowserPane() {
setEditable(false);
}
public void goToURL(URL url) {
displayPage(url);
history.add(url);
historyIndex = history.size() - 1;
}
public URL forward() {
historyIndex++;
if (historyIndex >= history.size())
historyIndex = history.size() - 1;
URL url = (URL) history.get(historyIndex);
displayPage(url);
return url;
}
public URL back() {
historyIndex--;
if (historyIndex < 0)
historyIndex = 0;
URL url = (URL) history.get(historyIndex);
displayPage(url);
return url;
}
private void displayPage(URL pageURL) {
try {
setPage(pageURL);
} catch (IOException ioException) {
ioException.printStackTrace();
}
}
} class WebToolBar extends JToolBar implements HyperlinkListener {
private WebBrowserPane webBrowserPane;
private JButton backButton;
private JButton forwardButton;
private JTextField urlTextField;
public WebToolBar(WebBrowserPane browser) {
super("Web Navigation");
// register for HyperlinkEvents
webBrowserPane = browser;
webBrowserPane.addHyperlinkListener(this);
urlTextField = new JTextField(25);
urlTextField.addActionListener(new ActionListener() {
// navigate webBrowser to user-entered URL
public void actionPerformed(ActionEvent event) {
try {
URL url = new URL(urlTextField.getText());
webBrowserPane.goToURL(url);
}
catch (MalformedURLException urlException) {
urlException.printStackTrace();
}
}
});
backButton = new JButton("back");
backButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
URL url = webBrowserPane.back();
urlTextField.setText(url.toString());
}
});
forwardButton = new JButton("forward");
forwardButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
URL url = webBrowserPane.forward();
urlTextField.setText(url.toString());
}
});
add(backButton);
add(forwardButton);
add(urlTextField);
}
public void hyperlinkUpdate(HyperlinkEvent event) {
if (event.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
URL url = event.getURL();
webBrowserPane.goToURL(url);
urlTextField.setText(url.toString());
}
}
}
</source>
