在java中如何响应单击JTree树中一个节点？.doc

package tree;import java.awt.Component;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 ernal.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.widthscreenSize.width) frameSize.width=screenSize.width; if(frameSize.heightscreenSize.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() publi