如何在JLabel中添加超链接?
题
在 jLabel 中添加超链接的最佳方式是什么?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?
解决方案
你可以这样做使用 JLabel
, 但一个替代办法将是一个风格 JButton
.这样一来,你不必担心 无障碍 和可以只开火事件的使用 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 */ }
}
其他提示
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,但当您将鼠标移到链接上时,它还会显示手形光标,因此外观和感觉就像大多数用户所期望的那样。如果平台不支持浏览,则不会创建可能误导用户的蓝色带下划线的 HTML 链接。相反,链接仅以纯文本形式呈现。这可以与 @dimo414 提出的 SwingLink 类结合起来。
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);
}
});
}
}
我写上一个JLabel关于如何设置超链接的制品或一个mailto。
所以只是尝试它的:
我想这就是你搜索什么的。
下面是完整的代码示例:
/**
* 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
}
}
});
}
}
也许使用 JXHyperlink
从 SwingX 代替。它延伸 JButton
.一些有用的链接:
<强>更新强>我收拾了SwingLink
类进一步并添加更多的功能;它的一个跟上时代的副本可以在这里找到: https://bitbucket.org/dimo414/jgrep/src/tip/src/grep/SwingLink.java
@麦克道尔的回答是伟大的,但有几件事情是可以改进的。比其他超链接文本值得注意的是可以点击的,它仍然看起来即使一些造型已经被改变/隐藏的按钮。而可访问性是重要的,相干UI是为好。
所以我放在一起基于麦克道尔的代码扩展的JLabel类。这是自包含的,妥善处理错误,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);
}
}
}
您也可以,例如,链接颜色改为紫色被点击之后,如果这似乎是有用的。它包含了所有的自我,你只需拨打:
SwingLink link = new SwingLink("Java", "http://java.sun.com");
mainPanel.add(link);
您可以尝试使用一个JEditorPane,而不是一个JLabel。这种理解基本的HTML和会HyperlinkEvent事件发送到你与JEditPane注册HyperlinkListener。
如果 <a href="link"> 不起作用,则:
- 创建一个JLabel,并添加一个MouseListener(装的标签看起来像一个超级链接)
- 实施 mouseClicked() 事件
- 在执行mouseClicked()活动,执行你的行动
看看 java。awt.桌面 API开链接,使用默认浏览器(这API仅可以从Java6).
我知道我有点迟到了,但我犯了一个小方法,别人可能会觉得凉爽/有用的。
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;
}
这会给你,就像一个正确的链路的JLabel。
在动作:
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);
}
如果你想不只是提示发送一个空。
希望有人认为这有用! (如果你这样做,一定要告诉我,我会很高兴地听到。)
使用一个JEditorPane
与HyperlinkListener
。
只要把window.open(website url)
,它屡试不爽。
下面的代码需要 JHyperLink
以被添加到构建路径。
JHyperlink stackOverflow = new JHyperlink("Click HERE!",
"https://www.stackoverflow.com/");
JComponent[] messageComponents = new JComponent[] { stackOverflow };
JOptionPane.showMessageDialog(null, messageComponents, "StackOverflow",
JOptionPane.PLAIN_MESSAGE);
请注意,可以用更JComponent
部件填充Swing
阵列。
结果:
可以下一个使用此
actionListener -> Runtime.getRuntime().exec("cmd.exe /c start chrome www.google.com")`
或者,如果你想使用Internet Explorer或Firefox与chrome
或iexplore
更换firefox