在java中如何响应单击JTree树中一个节点？

package tree;

import https://www.doczj.com/doc/a34078498.html,ponent;

import java.awt.Dimension;

import java.awt.Event;

import java.awt.Toolkit;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.beans.beancontext.BeanContext;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JMenuItem;

import javax.swing.JPopupMenu;

import javax.swing.JScrollPane;

import javax.swing.JTextField;

import javax.swing.JTree;

import javax.swing.event.TreeSelectionEvent;

import javax.swing.event.TreeSelectionListener;

import javax.swing.table.DefaultTableModel;

import javax.swing.tree.DefaultMutableTreeNode;

import javax.swing.tree.DefaultTreeModel;

import com.sun.xml.internal.messaging.saaj.packaging.mime.util.BEncoderStream;

public class MainFrame extends JFrame {

public static void main(String args[]) {

try {

MainFrame frame = new MainFrame();

Dimension frameSize = frame.getSize();

Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();

if(frameSize.width>screenSize.width){

frameSize.width=screenSize.width;

}

if(frameSize.height>screenSize.height){

frameSize.height=screenSize.height;

}

frame.setLocation((screenSize.width-frameSize.width)/2, (screenSize.height-frameSize.height)/2);

frame.setVisible(true);

} catch (Exception e) {

e.printStackTrace();

}

}

private JTree tree;

private DefaultMutableTreeNode root = new DefaultMutableTreeNode("语言");

private DefaultMutableTreeNode menu_accp = new DefaultMutableTreeNode("英语"); private DefaultMutableTreeNode menu_benet = new DefaultMutableTreeNode("法语"); private DefaultMutableTreeNode menu_accp_s1 = new DefaultMutableTreeNode("4级"); private DefaultMutableTreeNode menu_accp_s2 = new DefaultMutableTreeNode("6级"); private DefaultMutableTreeNode menu_accp_y2 = new DefaultMutableTreeNode("8级");

private JTextField txtParent;

private JTextField txtNode;

private JTextField txtType;

private JTextField txtChild;

private JPopupMenu popupMenu;

/**

* Create the frame

*/

public MainFrame() {

super();

getContentPane().setLayout(null);

setBounds(100, 100, 535, 375);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

final JScrollPane scrollPane = new JScrollPane();

scrollPane.setBounds(24, 10, 173, 317);

getContentPane().add(scrollPane);

tree = new JTree(root);

tree.addMouseListener(new MouseAdapter() {

public void mouseClicked(MouseEvent e) {

if(e.getModifiers()==Event.META_MASK){

addPopup(getContentPane(), popupMenu);

popupMenu.show(getContentPane(),e.getX()+30,e.getY()+40);

}

}

});

tree.addTreeSelectionListener(new TreeSelectionListener() {

public void valueChanged(TreeSelectionEvent e) {

DefaultMutableTreeNode node = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();

Object nodeInfo = node.getUserObject();

if(node.isRoot()){

txtParent.setText("");

txtNode.setText(nodeInfo.toString());

txtType.setText("根节点");

txtChild.setText(node.getChildCount() + "");

}else{

txtParent.setText(node.getParent().toString());

txtNode.setText(nodeInfo.toString());

if(node.isLeaf()){

txtType.setText("叶节点");

}else{

txtType.setText("枝节点");

}

txtChild.setText(node.getChildCount() + "");

}

}

});

scrollPane.setViewportView(tree);

txtParent = new JTextField();

txtParent.setBounds(339, 49, 90, 21);

getContentPane().add(txtParent);

txtNode = new JTextField();

txtNode.setBounds(339, 107, 90, 21);

getContentPane().add(txtNode);

txtType = new JTextField();

txtType.setBounds(339, 167, 90, 21);

getContentPane().add(txtType);

txtChild = new JTextField();

txtChild.setBounds(339, 231, 90, 21);

getContentPane().add(txtChild);

final JLabel label = new JLabel();

label.setText("父类型节点");

label.setBounds(225, 49, 90, 15);

getContentPane().add(label);

final JLabel label_1 = new JLabel();

label_1.setText("节点的名称");

label_1.setBounds(225, 107, 90, 15);

getContentPane().add(label_1);

final JLabel label_2 = new JLabel();

label_2.setText("节点的类型");

label_2.setBounds(225, 167, 90, 15);

getContentPane().add(label_2);

final JLabel label_3 = new JLabel();

label_3.setText("子节点的个数");

label_3.setBounds(225, 231, 90, 15);

getContentPane().add(label_3);

popupMenu = new JPopupMenu();

final JMenuItem menuItem = new JMenuItem();

menuItem.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

DefaultMutableTreeNode node = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();

DefaultTreeModel model = (DefaultTreeModel) tree.getModel();

model.removeNodeFromParent(node);

}

});

menuItem.setText("删除");

popupMenu.add(menuItem);

//

}

private static void addPopup(Component component, final JPopupMenu popup) {

component.addMouseListener(new MouseAdapter() {

public void mousePressed(MouseEvent e) {

if (e.isPopupTrigger())

showMenu(e);

}

public void mouseReleased(MouseEvent e) {

if (e.isPopupTrigger())

showMenu(e);

}

private void showMenu(MouseEvent e) {

popup.show(e.getComponent(), e.getX(), e.getY()); }

});

}

}