如何在 JLabel 中添加超链接？

在 JLabel 中添加超链接的最佳方法是什么？我可以使用 html 标签获得视图，但是当用户点击浏览器时如何打开它呢？

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小开

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

  1. Create a JLabel and add a MouseListener (decorate the label to look like a hyperlink)
  2. Implement mouseClicked() event
  3. 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).

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

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最佳答案

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 */ }
}
小开

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);
小开

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.

小开

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);
}
});
}
}
小开

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
}
}
});
}
}
小开

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.)

小开

Use a JEditorPane with a HyperlinkListener.

小开

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

小开

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:

小开

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


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