Question

在jLabel中添加超链接的最佳方法是哪种？我可以使用html标签获取视图，但是当用户点击它时如何打开浏览器？

Answer 1

您可以使用JLabel执行此操作，但另一种方法是设置JButton的样式。这样，您就不必担心accessibility，只能使用ActionListener触发事件。

  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 */ }
  }

Answer 2

我想提供另一种解决方案。它与已经提出的类似，因为它在JLabel中使用HTML代码，并在其上注册MouseListener，但是当您将鼠标移到链接上时它也会显示HandCursor，因此外观和感觉就像大多数用户一样期待。如果平台不支持浏览，则不会创建可能误导用户的带蓝色下划线的HTML链接。相反，链接只是以纯文本形式呈现。这可以与@ dimo414提出的SwingLink类结合使用。

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);
        }
    });
}
}

Answer 3

我写了一篇关于如何在jLabel上设置超链接或mailto的文章。

所以，试试it：

我认为这正是您要搜索的内容。

以下是完整的代码示例：

/**
 * 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
                }
            }
        });
    }
}

Answer 4

也许使用SwingX中的JXHyperlink。它扩展了JButton。一些有用的链接：

Answer 5

更新我进一步整理了SwingLink课程并添加了更多功能;可以在此处找到最新的副本：https://bitbucket.org/dimo414/jgrep/src/tip/src/grep/SwingLink.java

@ McDowell的答案很棒，但有几件事情可以改进。值得注意的是，超链接以外的文本是可点击的，即使某些样式已被更改/隐藏，它仍然看起来像一个按钮。虽然可访问性很重要，但同样的UI也是如此。

所以我根据McDowell的代码组建了一个扩展JLabel的类。它是独立的，可以正确处理错误，感觉更像是一个链接：

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);
    }
  }
}

例如，您可以在点击后将链接颜色更改为紫色，如果这看起来有用的话。它完全是自包含的，你只需要打电话：

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

Answer 6

您可以尝试使用JEditorPane而不是JLabel。这可以理解基本HTML，并将HyperlinkEvent事件发送到您使用JEditPane注册的HyperlinkListener。

Answer 7

如果＆lt; a href =“link”＆gt;不起作用，然后：

创建一个JLabel并添加一个MouseListener（将标签装饰成一个超链接）
实施mouseClicked()活动
在执行mouseClicked（）事件时，执行您的操作

查看使用默认浏览器打开链接的java.awt.Desktop API（此API仅适用于Java6）。

Answer 8

我知道我有点迟到了，但我做了一些方法，其他人可能觉得很酷/有用。

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;
}

它会给你一个JLabel，就像一个正确的链接。

行动中：

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);
}

如果您不想要工具提示，只需发送空。

希望有人觉得这很有用！（如果你这样做，请务必告诉我，我很乐意听到。）

Answer 9

JEditorPane使用HyperlinkListener。

Answer 10

只需放window.open(website url)，每次都有效。

Answer 11

您可以在

下使用此功能

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

或者如果您想使用Internet Explorer或Firefox将chrome替换为iexplore或firefox

如何在JLabel中添加超链接？

11 个答案: