我正在尝试将节点设为可点击的网址，但我似乎无法弄清楚如何。
我搜索过高低，我似乎无法找到解决方案。
这是我的代码：
public class NyttigeLinks {
private static JFrame nyttigeLinks;
public static void main(String[] args) {
initialize();
}
public NyttigeLinks() {
}
private static void initialize() {
nyttigeLinks = new JFrame();
nyttigeLinks.setBounds(new Rectangle(0, 0, 350, 650));
nyttigeLinks.getContentPane().setBounds(new Rectangle(0, 0, 350, 650));
nyttigeLinks.getContentPane().setComponentOrientation(ComponentOrientation.LEFT_TO_RIGHT);
nyttigeLinks.getContentPane().setLayout(null);
JLabel logoLabel = new JLabel("");
logoLabel.setIcon(new ImageIcon(NyttigeLinks.class.getResource("/images/ssiLogo.jpg")));
logoLabel.setBounds(0, 0, 350, 60);
JTree tree = new JTree();
nyttigeLinks.getContentPane().add(logoLabel);
JScrollPane scrollPane = new JScrollPane(tree);
scrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
scrollPane.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
scrollPane.setBounds(10, 71, 324, 508);
nyttigeLinks.getContentPane().add(scrollPane);
tree.setModel(new DefaultTreeModel(
new DefaultMutableTreeNode("Nyttige Links\t") {
{
DefaultMutableTreeNode node_1;
node_1 = new DefaultMutableTreeNode("Projekt Wiki");
node_1.add(new DefaultMutableTreeNode("AO"));
node_1.add(new DefaultMutableTreeNode("Attends"));
node_1.add(new DefaultMutableTreeNode("Carlsberg"));
node_1.add(new DefaultMutableTreeNode("COOP"));
node_1.add(new DefaultMutableTreeNode("Dafgaard"));
node_1.add(new DefaultMutableTreeNode("Jysk DK"));
node_1.add(new DefaultMutableTreeNode("Jysk SE"));
node_1.add(new DefaultMutableTreeNode("Kvadrat"));
node_1.add(new DefaultMutableTreeNode("Solar"));
node_1.add(new DefaultMutableTreeNode("Stockmann"));
node_1.add(new DefaultMutableTreeNode("Tine"));
node_1.add(new DefaultMutableTreeNode("Unicef"));
node_1.add(new DefaultMutableTreeNode("Vectura"));
add(node_1);
node_1 = new DefaultMutableTreeNode("Helpdesk Norcic");
node_1.add(new DefaultMutableTreeNode("Test"));
add(node_1);
node_1 = new DefaultMutableTreeNode("Test");
node_1.add(new DefaultMutableTreeNode("AO"));
node_1.add(new DefaultMutableTreeNode("Attends"));
node_1.add(new DefaultMutableTreeNode("Carlsberg"));
node_1.add(new DefaultMutableTreeNode("COOP"));
node_1.add(new DefaultMutableTreeNode("Dafgaard"));
node_1.add(new DefaultMutableTreeNode("Jysk DK"));
node_1.add(new DefaultMutableTreeNode("Jysk SE"));
node_1.add(new DefaultMutableTreeNode("Kvadrat"));
node_1.add(new DefaultMutableTreeNode("Solar"));
node_1.add(new DefaultMutableTreeNode("Stockmann"));
node_1.add(new DefaultMutableTreeNode("Tine"));
node_1.add(new DefaultMutableTreeNode("Unicef"));
node_1.add(new DefaultMutableTreeNode("VecturaAO"));
node_1.add(new DefaultMutableTreeNode("Attends"));
node_1.add(new DefaultMutableTreeNode("Carlsberg"));
node_1.add(new DefaultMutableTreeNode("COOP"));
node_1.add(new DefaultMutableTreeNode("Dafgaard"));
node_1.add(new DefaultMutableTreeNode("Jysk DK"));
node_1.add(new DefaultMutableTreeNode("Jysk SE"));
node_1.add(new DefaultMutableTreeNode("Kvadrat"));
node_1.add(new DefaultMutableTreeNode("Solar"));
node_1.add(new DefaultMutableTreeNode("Stockmann"));
node_1.add(new DefaultMutableTreeNode("Tine"));
node_1.add(new DefaultMutableTreeNode("Unicef"));
node_1.add(new DefaultMutableTreeNode("VecturaAO"));
node_1.add(new DefaultMutableTreeNode("Attends"));
node_1.add(new DefaultMutableTreeNode("Carlsberg"));
node_1.add(new DefaultMutableTreeNode("COOP"));
node_1.add(new DefaultMutableTreeNode("Dafgaard"));
node_1.add(new DefaultMutableTreeNode("Jysk DK"));
node_1.add(new DefaultMutableTreeNode("Jysk SE"));
node_1.add(new DefaultMutableTreeNode("Kvadrat"));
node_1.add(new DefaultMutableTreeNode("Solar"));
node_1.add(new DefaultMutableTreeNode("Stockmann"));
node_1.add(new DefaultMutableTreeNode("Tine"));
node_1.add(new DefaultMutableTreeNode("Unicef"));
node_1.add(new DefaultMutableTreeNode("Vectura"));
add(node_1);
}
}
));
tree.setBounds(10, 71, 324, 540);
tree.setRootVisible(false);
JLabel bottomLabelTop = new JLabel(" Nyttige Links Version 1.0");
bottomLabelTop.setBounds(0, 590, 230, 14);
nyttigeLinks.getContentPane().add(bottomLabelTop);
JLabel bottomLabelBot = new JLabel(" Made by xxx");
bottomLabelBot.setBounds(0, 605, 230, 15);
nyttigeLinks.getContentPane().add(bottomLabelBot);
JButton btnNewButton = new JButton("Admin");
btnNewButton.setIcon(new ImageIcon(NyttigeLinks.class.getResource("/images/appIcon.ico")));
btnNewButton.setBounds(240, 590, 80, 20);
nyttigeLinks.getContentPane().add(btnNewButton);
nyttigeLinks.setPreferredSize(new Dimension(350, 650));
nyttigeLinks.setSize(new Dimension(350, 650));
nyttigeLinks.setResizable(false);
nyttigeLinks.setTitle("Nyttige Links");
nyttigeLinks.setIconImage(Toolkit.getDefaultToolkit().getImage(NyttigeLinks.class.getResource("/images/appIcon.ico")));
nyttigeLinks.setBackground(Color.YELLOW);
nyttigeLinks.setBounds(100, 100, 350, 650);
nyttigeLinks.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
nyttigeLinks.setVisible(true);
}
}
我为一个菜鸟道歉，但你必须从某个地方开始，对吗？
如果有人能指出我正确的方向，我会非常感激！大家晚安！
答案 0 :(得分：2)
我不相信有办法让节点本身成为一个URL。但是，您可以通过在单击节点时使用侦听器打开浏览器来完成相同的操作。要打开浏览器，您可以使用Desktop#browse(URI)方法。
关于点击主题，我建议不要在单击节点时打开URL。对于非常烦人的用户（IMO）。相反，我建议使用双击。 This answer提供了区分单击和双击以及如何将其添加到Tree的好方法。
[...]但你必须从某个地方开始，对吧？
完全！请允许我在此提供更多细节，希望对学习更多有所帮助。
您将面临的一个挑战是如何知道为给定节点打开哪个URL。目前您只知道显示的String，我认为您可以安全地假设您不希望为每个节点显示完整的URL。我建议创建一个对象以传入DefaultMutableTreeNode构造函数，而不是使用String参数创建DefaultMutableTreeNode个对象。此对象还可以具有URI属性，以便它知道要打开的URL。
例如：
public class LeafNodeObject {
private final URI uri;
public LeafNodeObject(final String display, final URI uri) {
this.display = display;
this.uri = uri;
}
/**
* Override so that we control what is display on the Node
*/
@Override
public String toString() {
return display;
}
public void onDoubleClick() {
try {
Desktop.getDesktop().browse(uri);
} catch (final IOException e) {
e.printStackTrace();
}
}
}
可以像这样添加节点：
node_1.add(new DefaultMutableTreeNode(new LeafNodeObject("Test", new URI("www.eclipse.org"))));
在我们的听众中（从上面的链接略微修改）：
final MouseListener ml = new MouseAdapter() {
public void mousePressed(final MouseEvent e) {
final int selRow = tree.getRowForLocation(e.getX(), e.getY());
final TreePath selPath = tree.getPathForLocation(e.getX(), e.getY());
if (selRow != -1) {
final DefaultMutableTreeNode node = (DefaultMutableTreeNode) selPath.getLastPathComponent();
if (e.getClickCount() == 1) {
// Single click
} else if (e.getClickCount() == 2) {
// Double click
((LeafNodeObject) node.getUserObject()).onDoubleClick();
}
}
}
};
现在，当有双击事件时，我们会在我们创建的onDoubleClick()上调用LeafNodeObject方法。
这看起来很棒，除了我们将遇到非叶节点节点的类转换问题！为了解决这个问题，我们可以为这些节点创建一个类似的类（例如ParentNodeObject）。为了良好的OOP，我们应该认识到这两个类的共同行为（onDoubleClick()，还有onSingleClick()），并为共享能力创建一个接口。
例如：
public interface NodeObject {
public void onSingleClick();
public void onDoubleClick();
}
现在我们可以让我们的两个类实现这个接口：
public class ParentNodeObject implements NodeObject {
private final String display;
public ParentNodeObject(final String display) {
this.display = display;
}
/**
* Override so that we control what is display on the Node
*/
@Override
public String toString() {
return display;
}
@Override
public void onSingleClick() {
// Do nothing
}
@Override
public void onDoubleClick() {
// Do nothing
}
}
public class LeafNodeObject implements NodeObject {
private final URI uri;
public LeafNodeObject(final String display, final URI uri) {
this.display = display;
this.uri = uri;
}
/**
* Override so that we control what is display on the Node
*/
@Override
public String toString() {
return display;
}
@Override
public void onSingleClick() {
// Do nothing
}
@Override
public void onDoubleClick() {
try {
Desktop.getDesktop().browse(uri);
} catch (final IOException e) {
e.printStackTrace();
}
}
}
因此，在我们的监听器中，我们不再需要知道（并且不再关心）该节点是父节点还是叶节点。我们可以简单地调用onSingleClick()或onDoubleClick()，然后实现处理其余部分！
if (e.getClickCount() == 1) {
// Single click
((NodeObject) node.getUserObject()).onSingleClick();
} else if (e.getClickCount() == 2) {
// Double click
((NodeObject) node.getUserObject()).onDoubleClick();
}
回到代码中，可以像这样添加父节点和子节点：
node_1 = new DefaultMutableTreeNode(new ParentNodeObject("Helpdesk Norcic"));
node_1.add(new DefaultMutableTreeNode(new LeafNodeObject("Test", new URI("www.eclipse.org"))));
现在，当您单击或双击任何节点时，也会调用onSingleClick()或onDoubleClick()方法。在这种情况下，我们只关心在叶节点上双击时会发生什么，所以我们只需要填写该方法。
答案 1 :(得分：0)
虽然我没有检查上面提到的代码，但是在我等待回复此帖子时，我是如何解决这个问题的：
class SelectionListener implements TreeSelectionListener {
public void valueChanged(TreeSelectionEvent se) {
JTree tree = (JTree) se.getSource();
DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();
String selectedNodeName = selectedNode.toString();
if (selectedNode.isLeaf()) {
if (selectedNodeName == "Unicef") {
try {
java.awt.Desktop.getDesktop().browse(java.net.URI.create("http://www.eb.dk"));
} catch (IOException e1) {
// make a error pop up appear here
JOptionPane.showMessageDialog(null, "Something went wrong, please report this to the developer!", "Something went wrong", 0);
e1.printStackTrace();
}
}
if (selectedNodeName == "Vectura") {
try {
java.awt.Desktop.getDesktop().browse(java.net.URI.create("http://www.google.com"));
} catch (IOException e1) {
// make a error pop up appear here
JOptionPane.showMessageDialog(null, "Something went wrong, please report this to the developer!", "Something went wrong", 0);
e1.printStackTrace();
}
}
}
}
}
这绝对不是一种很好的方式，因为它会导致很多if语句，但这对我来说很容易理解。