How to add hyperlink in JLabel?

2019-01-01 08:57发布

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问题:

Which is the best way to add a hyperlink in jLabel? I can get the view using html tags, but how to open the browser when the user clicks on it?

回答1:

You can do this using a JLabel, but an alternative would be to style a JButton. That way, you don\'t have to worry about accessibility and can just fire events using an ActionListener.

  public static void main(String[] args) throws URISyntaxException {
    final URI uri = new URI(\"http://java.sun.com\");
    class OpenUrlAction implements ActionListener {
      @Override public void actionPerformed(ActionEvent e) {
        open(uri);
      }
    }
    JFrame frame = new JFrame(\"Links\");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(100, 400);
    Container container = frame.getContentPane();
    container.setLayout(new GridBagLayout());
    JButton button = new JButton();
    button.setText(\"<HTML>Click the <FONT color=\\\"#000099\\\"><U>link</U></FONT>\"
        + \" to go to the Java website.</HTML>\");
    button.setHorizontalAlignment(SwingConstants.LEFT);
    button.setBorderPainted(false);
    button.setOpaque(false);
    button.setBackground(Color.WHITE);
    button.setToolTipText(uri.toString());
    button.addActionListener(new OpenUrlAction());
    container.add(button);
    frame.setVisible(true);
  }

  private static void open(URI uri) {
    if (Desktop.isDesktopSupported()) {
      try {
        Desktop.getDesktop().browse(uri);
      } catch (IOException e) { /* TODO: error handling */ }
    } else { /* TODO: error handling */ }
  }

回答2:

I\'d like to offer yet another solution. It\'s similar to the already proposed ones as it uses HTML-code in a JLabel, and registers a MouseListener on it, but it also displays a HandCursor when you move the mouse over the link, so the look&feel is just like what most users would expect. If browsing is not supported by the platform, no blue, underlined HTML-link is created that could mislead the user. Instead, the link is just presented as plain text. This could be combined with the SwingLink class proposed by @dimo414.

public class JLabelLink extends JFrame {

private static final String LABEL_TEXT = \"For further information visit:\";
private static final String A_VALID_LINK = \"http://stackoverflow.com\";
private static final String A_HREF = \"<a href=\\\"\";
private static final String HREF_CLOSED = \"\\\">\";
private static final String HREF_END = \"</a>\";
private static final String HTML = \"<html>\";
private static final String HTML_END = \"</html>\";

public JLabelLink() {
    setTitle(\"HTML link via a JLabel\");
    setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

    Container contentPane = getContentPane();
    contentPane.setLayout(new FlowLayout(FlowLayout.LEFT));

    JLabel label = new JLabel(LABEL_TEXT);
    contentPane.add(label);

    label = new JLabel(A_VALID_LINK);
    contentPane.add(label);
    if (isBrowsingSupported()) {
        makeLinkable(label, new LinkMouseListener());
    }

    pack();
}

private static void makeLinkable(JLabel c, MouseListener ml) {
    assert ml != null;
    c.setText(htmlIfy(linkIfy(c.getText())));
    c.setCursor(new java.awt.Cursor(java.awt.Cursor.HAND_CURSOR));
    c.addMouseListener(ml);
}

private static boolean isBrowsingSupported() {
    if (!Desktop.isDesktopSupported()) {
        return false;
    }
    boolean result = false;
    Desktop desktop = java.awt.Desktop.getDesktop();
    if (desktop.isSupported(Desktop.Action.BROWSE)) {
        result = true;
    }
    return result;

}

private static class LinkMouseListener extends MouseAdapter {

    @Override
    public void mouseClicked(java.awt.event.MouseEvent evt) {
        JLabel l = (JLabel) evt.getSource();
        try {
            URI uri = new java.net.URI(JLabelLink.getPlainLink(l.getText()));
            (new LinkRunner(uri)).execute();
        } catch (URISyntaxException use) {
            throw new AssertionError(use + \": \" + l.getText()); //NOI18N
        }
    }
}

private static class LinkRunner extends SwingWorker<Void, Void> {

    private final URI uri;

    private LinkRunner(URI u) {
        if (u == null) {
            throw new NullPointerException();
        }
        uri = u;
    }

    @Override
    protected Void doInBackground() throws Exception {
        Desktop desktop = java.awt.Desktop.getDesktop();
        desktop.browse(uri);
        return null;
    }

    @Override
    protected void done() {
        try {
            get();
        } catch (ExecutionException ee) {
            handleException(uri, ee);
        } catch (InterruptedException ie) {
            handleException(uri, ie);
        }
    }

    private static void handleException(URI u, Exception e) {
        JOptionPane.showMessageDialog(null, \"Sorry, a problem occurred while trying to open this link in your system\'s standard browser.\", \"A problem occured\", JOptionPane.ERROR_MESSAGE);
    }
}

private static String getPlainLink(String s) {
    return s.substring(s.indexOf(A_HREF) + A_HREF.length(), s.indexOf(HREF_CLOSED));
}

//WARNING
//This method requires that s is a plain string that requires
//no further escaping
private static String linkIfy(String s) {
    return A_HREF.concat(s).concat(HREF_CLOSED).concat(s).concat(HREF_END);
}

//WARNING
//This method requires that s is a plain string that requires
//no further escaping
private static String htmlIfy(String s) {
    return HTML.concat(s).concat(HTML_END);
}

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {

        @Override
        public void run() {
            new JLabelLink().setVisible(true);
        }
    });
}
}

回答3:

I wrote an article on how to set a hyperlink or a mailto on a jLabel.

So just try it :

I think that\'s exactly what you\'re searching for.

Here\'s the complete code example :

/**
 * Example of a jLabel Hyperlink and a jLabel Mailto
 */

import java.awt.Cursor;
import java.awt.Desktop;
import java.awt.EventQueue;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

/**
 *
 * @author ibrabelware
 */
public class JLabelLink extends JFrame {
    private JPanel pan;
    private JLabel contact;
        private JLabel website;
    /**
     * Creates new form JLabelLink
     */
    public JLabelLink() {
        this.setTitle(\"jLabelLinkExample\");
        this.setSize(300, 100);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setLocationRelativeTo(null);

        pan = new JPanel();
        contact = new JLabel();
        website = new JLabel();

        contact.setText(\"<html> contact : <a href=\\\"\\\">YourEmailAddress@gmail.com</a></html>\");
        contact.setCursor(new Cursor(Cursor.HAND_CURSOR));

        website.setText(\"<html> Website : <a href=\\\"\\\">http://www.google.com/</a></html>\");
        website.setCursor(new Cursor(Cursor.HAND_CURSOR));

    pan.add(contact);
    pan.add(website);
        this.setContentPane(pan);
        this.setVisible(true);
        sendMail(contact);
        goWebsite(website);
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /*
         * Create and display the form
         */
        EventQueue.invokeLater(new Runnable() {

            @Override
            public void run() {
                new JLabelLink().setVisible(true);
            }
        });
    }

    private void goWebsite(JLabel website) {
        website.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                try {
                    Desktop.getDesktop().browse(new URI(\"http://www.google.com/webhp?nomo=1&hl=fr\"));
                } catch (URISyntaxException | IOException ex) {
                    //It looks like there\'s a problem
                }
            }
        });
    }

    private void sendMail(JLabel contact) {
        contact.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                try {
                    Desktop.getDesktop().mail(new URI(\"mailto:YourEmailAddress@gmail.com?subject=TEST\"));
                } catch (URISyntaxException | IOException ex) {
                    //It looks like there\'s a problem
                }
            }
        });
    }
}

回答4:

Maybe use JXHyperlink from SwingX instead. It extends JButton. Some useful links:

Class JXHyperlink
SwingX: Consider JXHyperlink As An Alternative To Buttons

回答5:

Update I\'ve tidied up the SwingLink class further and added more features; an up-to-date copy of it can be found here: https://bitbucket.org/dimo414/jgrep/src/tip/src/grep/SwingLink.java

@McDowell\'s answer is great, but there\'s several things that could be improved upon. Notably text other than the hyperlink is clickable and it still looks like a button even though some of the styling has been changed/hidden. While accessibility is important, a coherent UI is as well.

So I put together a class extending JLabel based on McDowell\'s code. It\'s self-contained, handles errors properly, and feels more like a link:

public class SwingLink extends JLabel {
  private static final long serialVersionUID = 8273875024682878518L;
  private String text;
  private URI uri;

  public SwingLink(String text, URI uri){
    super();
    setup(text,uri);
  }

  public SwingLink(String text, String uri){
    super();
    setup(text,URI.create(uri));
  }

  public void setup(String t, URI u){
    text = t;
    uri = u;
    setText(text);
    setToolTipText(uri.toString());
    addMouseListener(new MouseAdapter() {
      public void mouseClicked(MouseEvent e) {
        open(uri);
      }
      public void mouseEntered(MouseEvent e) {
        setText(text,false);
      }
      public void mouseExited(MouseEvent e) {
        setText(text,true);
      }
    });
  }

  @Override
  public void setText(String text){
    setText(text,true);
  }

  public void setText(String text, boolean ul){
    String link = ul ? \"<u>\"+text+\"</u>\" : text;
    super.setText(\"<html><span style=\\\"color: #000099;\\\">\"+
    link+\"</span></html>\");
    this.text = text;
  }

  public String getRawText(){
    return text;
  }

  private static void open(URI uri) {
    if (Desktop.isDesktopSupported()) {
      Desktop desktop = Desktop.getDesktop();
      try {
        desktop.browse(uri);
      } catch (IOException e) {
        JOptionPane.showMessageDialog(null,
            \"Failed to launch the link, your computer is likely misconfigured.\",
            \"Cannot Launch Link\",JOptionPane.WARNING_MESSAGE);
      }
    } else {
      JOptionPane.showMessageDialog(null,
          \"Java is not able to launch links on your computer.\",
          \"Cannot Launch Link\", JOptionPane.WARNING_MESSAGE);
    }
  }
}

You could also, for instance, change the link color to purple after being clicked, if that seemed useful. It\'s all self contained, you simply call:

SwingLink link = new SwingLink(\"Java\", \"http://java.sun.com\");
mainPanel.add(link);

回答6:

You might try using a JEditorPane instead of a JLabel. This understands basic HTML and will send a HyperlinkEvent event to the HyperlinkListener you register with the JEditPane.

回答7:

If <a href=\"link\"> doesn\'t work, then:

Create a JLabel and add a MouseListener (decorate the label to look like a hyperlink)
Implement mouseClicked() event
In the implementation of mouseClicked() event, perform your action

Have a look at java.awt.Desktop API for opening a link using the default browser (this API is available only from Java6).

回答8:

I know I\'m kinda late to the party but I made a little method others might find cool/useful.

public static JLabel linkify(final String text, String URL, String toolTip)
{
    URI temp = null;
    try
    {
        temp = new URI(URL);
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }
    final URI uri = temp;
    final JLabel link = new JLabel();
    link.setText(\"<HTML><FONT color=\\\"#000099\\\">\"+text+\"</FONT></HTML>\");
    if(!toolTip.equals(\"\"))
        link.setToolTipText(toolTip);
    link.setCursor(new Cursor(Cursor.HAND_CURSOR));
    link.addMouseListener(new MouseListener()
    {
        public void mouseExited(MouseEvent arg0)
        {
            link.setText(\"<HTML><FONT color=\\\"#000099\\\">\"+text+\"</FONT></HTML>\");
        }

        public void mouseEntered(MouseEvent arg0)
        {
            link.setText(\"<HTML><FONT color=\\\"#000099\\\"><U>\"+text+\"</U></FONT></HTML>\");
        }

        public void mouseClicked(MouseEvent arg0)
        {
            if (Desktop.isDesktopSupported())
            {
                try
                {
                    Desktop.getDesktop().browse(uri);
                }
                catch (Exception e)
                {
                    e.printStackTrace();
                }
            }
            else
            {
                JOptionPane pane = new JOptionPane(\"Could not open link.\");
                JDialog dialog = pane.createDialog(new JFrame(), \"\");
                dialog.setVisible(true);
            }
        }

        public void mousePressed(MouseEvent e)
        {
        }

        public void mouseReleased(MouseEvent e)
        {
        }
    });
    return link;
}

It\'ll give you a JLabel that acts like a proper link.

In action:

public static void main(String[] args)
{
    JFrame frame = new JFrame(\"Linkify Test\");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(400, 100);
    frame.setLocationRelativeTo(null);
    Container container = frame.getContentPane();
    container.setLayout(new GridBagLayout());
    container.add(new JLabel(\"Click \"));
    container.add(linkify(\"this\", \"http://facebook.com\", \"Facebook\"));
    container.add(new JLabel(\" link to open Facebook.\"));
    frame.setVisible(true);
}

If you\'d like no tooltip just send a null.

Hope someone finds this useful! (If you do, be sure to let me know, I\'d be happy to hear.)

回答9:

Use a JEditorPane with a HyperlinkListener.

回答10:

Just put window.open(website url), it works every time.

回答11:

The following code requires JHyperLink to be added to your build path.

JHyperlink stackOverflow = new JHyperlink(\"Click HERE!\",
                \"https://www.stackoverflow.com/\");

JComponent[] messageComponents = new JComponent[] { stackOverflow };

JOptionPane.showMessageDialog(null, messageComponents, \"StackOverflow\",
                JOptionPane.PLAIN_MESSAGE);

Note that you can fill the JComponent array with more Swing components.

Result:

$\"\"$

回答12:

You can use this under an

actionListener ->  Runtime.getRuntime().exec(\"cmd.exe /c start chrome www.google.com\")`

or if you want to use Internet Explorer or Firefox replace chrome with iexplore or firefox

标签： java swing hyperlink jlabel

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