请教,怎样返回一个指定的jtree上的节点的内容?谢谢

Question

代码如下:
package fy;import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import com.borland.jbcl.layout.*;
import javax.swing.tree.*;
import java.lang.*;
import javax.swing.event.*;
/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Company: </p>
 * @author unascribed
 * @version 1.0
 */public class Frame1 extends JFrame {
  private JPanel contentPane;
  private BorderLayout borderLayout1 = new BorderLayout();
  private JPanel jPanel1 = new JPanel();
  private XYLayout xYLayout1 = new XYLayout();
  private JTree jTree1 = new JTree();
  private JButton jButton1 = new JButton();
  private JPopupMenu jPopupMenu1 = new JPopupMenu();
  private JMenuItem jMenuItem1 = new JMenuItem();
  private JMenuItem jMenuItem2 = new JMenuItem();
  private JMenuItem jMenuItem3 = new JMenuItem();
  private JMenuItem jMenuItem4 = new JMenuItem();
  private JMenu jMenu1 = new JMenu();
  private JMenuItem jMenuItem5 = new JMenuItem();
  private JMenuItem jMenuItem6 = new JMenuItem();
  private JMenuItem jMenuItem7 = new JMenuItem();
  private JMenuItem jMenuItem8 = new JMenuItem();  //Construct the frame
  public Frame1() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }
  //Component initialization
  private void jbInit() throws Exception  {
    //setIconImage(Toolkit.getDefaultToolkit().createImage(Frame1.class.getResource("[Your Icon]")));
    contentPane = (JPanel) this.getContentPane();
    contentPane.setLayout(borderLayout1);
    this.setSize(new Dimension(400, 300));
    this.setTitle("Frame Title");
    this.addKeyListener(new java.awt.event.KeyAdapter() {    });    jPanel1.setLayout(xYLayout1);
    jButton1.setText("ok");
    jButton1.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        jButton1_actionPerformed(e);
      }
    });
    contentPane.setToolTipText("");
    jPanel1.setToolTipText("");
    jPanel1.addMouseListener(new java.awt.event.MouseAdapter() {
      //public void mouseClicked(MouseEvent e) {
        //jPanel1_mouseClicked(e);
      //}
    });
    jPopupMenu1.setInvoker(this);
    jPopupMenu1.addMouseListener(new java.awt.event.MouseAdapter() {
      public void mouseClicked(MouseEvent e) {
        jPopupMenu1_mouseClicked(e);
      }
    });
    jMenuItem1.setText("添加");
    jMenuItem2.setText("删除");
    jMenuItem3.setText("刷新");
    jMenuItem4.setText("重命名");
    jMenu1.setText("新建");
    jMenuItem5.setText("子节点");
    jMenuItem6.setText("变量");
    jMenuItem7.setText("属性");
    contentPane.add(jPanel1, BorderLayout.CENTER);
    jPanel1.add(jTree1,   new XYConstraints(20, 16, 309, 224));
    jPanel1.add(jButton1, new XYConstraints(196, 259, 81, 30));
    jPopupMenu1.add(jMenuItem1);
    jPopupMenu1.add(jMenuItem2);
    jPopupMenu1.add(jMenuItem3);
    jPopupMenu1.add(jMenuItem4);
    jPopupMenu1.add(jMenu1);
    jPopupMenu1.addSeparator();
    jMenu1.add(jMenuItem5);
    jMenu1.add(jMenuItem6);
    jTree1.addMouseListener(new MouseAdapter() {
     public void  mouseReleased(MouseEvent me){
          jPopupMenu1_mouseClicked(me);
     }
      public void mouseClicked(MouseEvent e) {
        jTree1_mouseClicked(e);
      }
 });
    jPopupMenu1.add(jMenuItem7);
    jPopupMenu1.add(jMenuItem8);  }
  //Overridden so we can exit when window is closed
  protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }  void jButton1_actionPerformed(ActionEvent e) {    class Tdata     /*二叉树的定义*/
          {
             int  data;
             Tdata  child,brother;
          }
    class  TreeLink  /*工作链表的定义*/
          {
             Tdata  Node;
             DefaultMutableTreeNode  a;   /*定义节点a*/
             TreeLink  next;   /*链指针*/
             TreeLink()
              {
                Node=null;
                next=null;
              }
        }
/*程序框架*/
TreeLink  head,p;
Tdata data=new Tdata();
Tdata data1=new Tdata();
Tdata data2=new Tdata();
Tdata data3=new Tdata();
Tdata data4=new Tdata();
Tdata data5=new Tdata();
Tdata data6=new Tdata();
Tdata data7=new Tdata();
data.data=0;
data1.data=1;
data2.data=2;
data3.data=3;
data4.data=4;
data5.data=5;
data6.data=6;
data7.data=7;
//data1、data2、data3属于第一级
data1.child=data.child;
data.child=data1;
data2.brother=data1.brother;
data1.brother=data2;
data3.brother=data2.child;
data2.brother=data3;
//data4、data5是data2data2的child
data4.child=data2.child;
data2.child=data4;
data5.brother=data4.brother;
data4.brother=data5;
//data6是data3的child
data6.child=data3.child;
data3.child=data6;
//data7是data5的chlid
data7.child=data5.child;
data5.child=data7;head=new TreeLink();    /*实例化*/
DefaultMutableTreeNode root=new DefaultMutableTreeNode("root");
DefaultTreeModel mod;
p=new TreeLink();      /*实例化*/
p.Node=data;
p.a=root;     /*储存"root",用以实现二叉树和jtree的一一对应*/
p.next=head.next;    /*将root点加入链表的指针变化*/
head.next=p;          /*将root点加入链表的指针变化*/
while(head.next!=null){
  p=head.next;     /*取链表的头节点*/
  head.next=p.next;  /*取链表的头节点*/
  Tdata  node=p.Node;
  node=node.child;
  while(node!=null){
    DefaultMutableTreeNode no=new DefaultMutableTreeNode(String.valueOf(node.data));
                           /*将no以文件夹的形式画在root的下一级*/
    p.a.add(no);
    TreeLink tt=new TreeLink();
    tt.Node=node;
    tt.a=no;
    tt.next=head.next;
    head.next=tt;
    node=node.brother;
  }
}
mod=new DefaultTreeModel(root);
jTree1.setModel(mod);
  }  void jPopupMenu1_mouseClicked(MouseEvent e) {
     if(e.getModifiers()==Event.META_MASK){
      jPopupMenu1.show(jTree1,e.getX(),e.getY());
     }
  }  void jTree1_mouseClicked(MouseEvent e) {
   ???????
    
    
    
  }
}

Answer 1

sorry,我说错了一个地方“当点击了树上的一个节点后要返回的不是该节点的内容，而应该是这个节点的TreeNode”.

Answer 2

node.toString();
node是你当前点击的节点。
在树中加一个事件来使用这个函数就可以得到

Answer 3

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;public class TreeDemo6 implements ActionListener,TreeModelListener
{
    JLabel label = null;
    JTree tree = null;
    DefaultTreeModel treeModel = null;
    String nodeName = null; //原有节点名称 
    
    public TreeDemo6()
    {
        JFrame f = new JFrame("TreeDemo");
        Container contentPane = f.getContentPane();
        
        DefaultMutableTreeNode root = new DefaultMutableTreeNode("资源管理器");
        
        tree = new JTree(root);
        tree.setEditable(true);
        tree.addMouseListener(new MouseHandle());
        treeModel = (DefaultTreeModel)tree.getModel();
        treeModel.addTreeModelListener(this);
        
        JScrollPane scrollPane = new JScrollPane();
        scrollPane.setViewportView(tree);
        
        JPanel panel = new JPanel();
        JButton b = new JButton("新增节点");
        b.addActionListener(this);
        panel.add(b);
                
        label = new JLabel("Action");
        contentPane.add(panel,BorderLayout.NORTH);
        contentPane.add(scrollPane,BorderLayout.CENTER);
        contentPane.add(label,BorderLayout.SOUTH);
        f.pack();
        f.setVisible(true);
        
        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });    }
    
    public void actionPerformed(ActionEvent ae)
    {
        if (ae.getActionCommand().equals("新增节点"))
        {
            DefaultMutableTreeNode parentNode = null;
            
            DefaultMutableTreeNode newNode = new DefaultMutableTreeNode("新节点");
            newNode.setAllowsChildren(true);
            TreePath parentPath = tree.getSelectionPath();            parentNode = (DefaultMutableTreeNode)
                             (parentPath.getLastPathComponent());            treeModel.insertNodeInto(newNode,parentNode,parentNode.getChildCount());
            tree.scrollPathToVisible(new TreePath(newNode.getPath()));
            
            label.setText("新增节点成功");
        }
        
    }
    
    public void treeNodesChanged(TreeModelEvent e) {
        
        TreePath treePath = e.getTreePath();
        DefaultMutableTreeNode node = (DefaultMutableTreeNode)treePath.getLastPathComponent();
        try {
            int[] index = e.getChildIndices();
            node = (DefaultMutableTreeNode)node.getChildAt(index[0]);
        } catch (NullPointerException exc) {}
        label.setText(nodeName+" 更改数据为: "+(String)node.toString());//这个就是你想得到的节点名称
    }
    public void treeNodesInserted(TreeModelEvent e) {
        System.out.println("new node inserted");
    }
    public void treeNodesRemoved(TreeModelEvent e) {
        System.out.println("node deleted");
    }
    public void treeStructureChanged(TreeModelEvent e) {
        System.out.println("structrue changed");
    }    public static void main(String args[]) {
    
        new TreeDemo6();
    }
    
    class MouseHandle extends MouseAdapter
    {
        public void mousePressed(MouseEvent e) 
        {
            try{
                JTree tree = (JTree)e.getSource();
            
                int rowLocation = tree.getRowForLocation(e.getX(), e.getY());
                TreePath treepath = tree.getPathForRow(rowLocation);
                TreeNode treenode = (TreeNode) treepath.getLastPathComponent(); 
            
                nodeName = treenode.toString();
            }catch(NullPointerException ne){}
        }
    }
}