java 中在树节点上右击弹出菜单的方法！！！

Question

如何在JTree控件上的指定的节点上右击就弹出菜单，是在节点上右击弹出，不是在树的任一个地方！！！！最好是给一个简单的例子！！！谢谢！！！

Answer 1

JTree fTree = new JTree(); fTree.addMouseListener(new MouseListener() { @Override
public void mouseClicked(MouseEvent e) {
} @Override
public void mouseEntered(MouseEvent e) {
} @Override
public void mouseExited(MouseEvent e) {
} @Override
public void mousePressed(MouseEvent e) {
} @Override
public void mouseReleased(MouseEvent e) { if (e.isPopupTrigger()) {
JTree tree = (JTree) e.getComponent();
TreePath path = tree.getPathForLocation(e.getX(), e.getY()); tree.setSelectionPath(path); if (path == null) {
System.out.println("Not click on the node...");
return;
}
if (path.getParentPath() != null) {
JMenuItem menu1 = new JMenuItem("menu1");
JMenuItem menu2 = new JMenuItem("menu2");
JMenuItem menu3 = new JMenuItem("menu3");
JMenuItem menu4 = new JMenuItem("menu4");
JMenuItem menu5 = new JMenuItem("menu5");
JPopupMenu popupMenu1;
popupMenu1 = new JPopupMenu();
popupMenu1.add(menu3);
popupMenu1.add(menu4);
popupMenu1.add(menu5);
popupMenu1.add(menu1);
popupMenu1.add(menu2);
menu1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
}
});
popupMenu1.show(tree, e.getX(), e.getY());
}
}
} });

Answer 2

我写成这样，不对！为什么啊！import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JFrame;
import javax.swing.JMenuItem;
import javax.swing.JPopupMenu;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreePath;
public class TreeNodePopMenu extends JFrame implements ActionListener{

private DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");
private DefaultTreeModel dtm = new DefaultTreeModel(root);//创建根节点
private JTree jt=new JTree(dtm);//利用上一步的根，创建树状列表控件，

public TreeNodePopMenu(){

this.initialFrame();
this.addListener();
}

public void initialFrame() {

this.add(jt);
this.setBounds(50, 50, 250, 400);
this.setVisible(true);
this.setDefaultCloseOperation(EXIT_ON_CLOSE);
}

public void addListener(){

jt.addMouseListener(new MouseListener() {            @Override
            public void mouseReleased(MouseEvent e) {                if (e.isPopupTrigger()) {
                    JTree tree = (JTree) e.getComponent();
                    TreePath path = tree.getPathForLocation(e.getX(), e.getY());                    tree.setSelectionPath(path);                    if (path == null) {
                        System.out.println("Not click on the node...");
                        return;
                    }
                    if (path.getParentPath() != null) {
                        JMenuItem menu1 = new JMenuItem("menu1");
                        JMenuItem menu2 = new JMenuItem("menu2");
                        JMenuItem menu3 = new JMenuItem("menu3");
                        JMenuItem menu4 = new JMenuItem("menu4");
                        JMenuItem menu5 = new JMenuItem("menu5");
                        JPopupMenu popupMenu1;
                        popupMenu1 = new JPopupMenu();
                        popupMenu1.add(menu3);
                        popupMenu1.add(menu4);
                        popupMenu1.add(menu5);
                        popupMenu1.add(menu1);
                        popupMenu1.add(menu2);
                        menu1.addActionListener(new ActionListener() {
                            public void actionPerformed(ActionEvent e) {
                            }
                        });
                        popupMenu1.show(tree, e.getX(), e.getY());
                    }
                }
            } @Override
public void mouseClicked(MouseEvent arg0) {
// TODO Auto-generated method stub

} @Override
public void mouseEntered(MouseEvent arg0) {
// TODO Auto-generated method stub

} @Override
public void mouseExited(MouseEvent arg0) {
// TODO Auto-generated method stub

} @Override
public void mousePressed(MouseEvent arg0) {
// TODO Auto-generated method stub

}
        });
}

@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub

}

public static void main(String[] args){
new TreeNodePopMenu();
}}