高分 求一树问题 希望各位大侠指点

Question

本人是个菜鸟 最近遇到个难题 我想做一个树 要求 有右键菜单 可以新建立和删除 新建要求父节点下建立子节点 N层的 就是新建的子节点总是你选中节点的子节点 可以一直新建下去 N层 请各位大侠指导阿 最好有源代码 语言要JAVA 包用SWT的 谢谢啊 我得邮箱是[email protected] 收到满意答案 马上结帖 谢谢大家了

Answer 1

SoB 
你杂不叫氧化钙0428

Answer 2

仅供参考
package rjc;import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.tree.*;
//import com.incors.plaf.alloy.*;
//import com.incors.plaf.alloy.themes.bedouin.*;public class TreeDemo5 implements TreeModelListener
{
    JLabel label = null;
    String nodeName = null; //原有节点名称
    
    public TreeDemo5()
    {
//        try {
//         AlloyLookAndFeel.setProperty("alloy.isLookAndFeelFrameDecoration", "true");
//         AlloyTheme theme = new BedouinTheme();//设置界面的外观，手册中共有5种样式
//         LookAndFeel alloyLnF = new AlloyLookAndFeel(theme);
//            UIManager.setLookAndFeel(alloyLnF);
//        } catch (UnsupportedLookAndFeelException ex) {
        // You may handle the exception here
//        }
         // this line needs to be implemented in order to make JWS work properly
        UIManager.getLookAndFeelDefaults().put("ClassLoader", getClass().getClassLoader());
        JFrame f = new JFrame("TreeDemo");
        Container contentPane = f.getContentPane();
        
        DefaultMutableTreeNode root = new DefaultMutableTreeNode("资源管理器");
        DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("文件夹");
        DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("我的电脑");
        DefaultMutableTreeNode node3 = new DefaultMutableTreeNode("收藏夹");
        DefaultMutableTreeNode node4 = new DefaultMutableTreeNode("Readme");
        root.add(node1);
        root.add(node2);
        root.add(node3);
        root.add(node4);
        
        DefaultMutableTreeNode leafnode = new DefaultMutableTreeNode("公司文件");
        node1.add(leafnode);
        leafnode = new DefaultMutableTreeNode("个人信件");
        node1.add(leafnode);
        leafnode = new DefaultMutableTreeNode("私人文件");
        node1.add(leafnode);
        
        leafnode = new DefaultMutableTreeNode("本机磁盘(C:)");
        node2.add(leafnode);
        leafnode = new DefaultMutableTreeNode("本机磁盘(D:)");
        node2.add(leafnode);
        leafnode = new DefaultMutableTreeNode("本机磁盘(E:)");
        node2.add(leafnode);
        
        DefaultMutableTreeNode node31 = new DefaultMutableTreeNode("网站列表");
        node3.add(node31);
        
        leafnode = new DefaultMutableTreeNode("天勤网站");
        node31.add(leafnode);
        leafnode = new DefaultMutableTreeNode("足球消息");
        node31.add(leafnode);
        leafnode = new DefaultMutableTreeNode("网络书店");
        node31.add(leafnode);
        
        JTree tree = new JTree(root);
        tree.setEditable(true);//设置JTree为可编辑的
        tree.addMouseListener(new MouseHandle());//使Tree加入检测Mouse事件，以便取得节点名称 
        //下面两行取得DefaultTreeModel,并检测是否有TreeModelEvent事件.
        DefaultTreeModel treeModel = (DefaultTreeModel)tree.getModel();
        treeModel.addTreeModelListener(this);
        
        JScrollPane scrollPane = new JScrollPane();
        scrollPane.setViewportView(tree);
        
        label = new JLabel("更改数据为: ");
        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);
            }
        });    }
    /*本方法实作TreeModelListener接口，本接口共定义四个方法，分别是TreeNodesChanged()
     *treeNodesInserted()、treeNodesRemoved()、treeNodesRemoved()、
     *treeStructureChanged().在此范例中我们只针对更改节点值的部份，因此只实作
     *treeNodesChanged()方法.
     */
    public void treeNodesChanged(TreeModelEvent e) {
        
        TreePath treePath = e.getTreePath();
        System.out.println(treePath);
        //下面这行由TreeModelEvent取得的DefaultMutableTreeNode为节点的父节点，而不是用户点选
        //的节点，这点读者要特别注意。要取得真正的节点需要再加写下面6行代码.
        DefaultMutableTreeNode node = (DefaultMutableTreeNode)treePath.getLastPathComponent();
        try {
            //getChildIndices()方法会返回目前修改节点的索引值。由于我们只修改一个节点，因此节点索引值就放在index[0]
            //的位置，若点选的节点为root node,则getChildIndices()的返回值为null,程序下面的第二行就在处理点选root
            //node产生的NullPointerException问题.
            int[] index = e.getChildIndices();
              //由DefaultMutableTreeNode类的getChildAt()方法取得修改的节点对象.
            node = (DefaultMutableTreeNode)node.getChildAt(index[0]);
        } catch (NullPointerException exc) {}
        //由DefaultMutableTreeNode类getUserObject()方法取得节点的内容，或是写成node.toString()亦相同.
        label.setText(nodeName+"更改数据为: "+(String)node.getUserObject());
    }
    public void treeNodesInserted(TreeModelEvent e) {
    }
    public void treeNodesRemoved(TreeModelEvent e) {
    }
    public void treeStructureChanged(TreeModelEvent e) {
    }    public static void main(String args[]) {
    
        new TreeDemo5();
    }
    //处理Mouse点选事件
    class MouseHandle extends MouseAdapter
    {
        public void mousePressed(MouseEvent e) 
        {
            try{
              JTree tree = (JTree)e.getSource();
        //JTree的getRowForLocation()方法会返回节点的列索引值。例如本例中，“本机磁盘(D:)”的列索引值为4,此索引值
        //会随着其他数据夹的打开或收起而变支，但“资源管理器”的列索引值恒为0. 
              int rowLocation = tree.getRowForLocation(e.getX(), e.getY());             /*JTree的getPathForRow()方法会取得从root node到点选节点的一条path,此path为一条直线，如程序运行的图示
              *若你点选“本机磁盘(E:)”,则Tree Path为"资源管理器"-->"我的电脑"-->"本机磁盘(E:)",因此利用TreePath
              *的getLastPathComponent()方法就可以取得所点选的节点.
              */              TreePath treepath = tree.getPathForRow(rowLocation);
              TreeNode treenode = (TreeNode) treepath.getLastPathComponent(); 
        
              nodeName = treenode.toString();
            }catch(NullPointerException ne){}
        }
    }
}

Answer 3

看下API很简单的,DefaultTreeModel DefaultTreeNode.

Answer 4

汗！原来你要SWT的，我用SWing给做了，功能完全实现了，觉得好的话就给分吧
/**
   @version 1.02 2008-01-06
   @author tanlingyun
*/import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;/**
   This program demonstrates tree editing.
*/
public class TreeEditTest
{  
   public static void main(String[] args)
   {  
      JFrame frame = new TreeEditFrame();
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setVisible(true);
   }
}/**
   A frame with a tree and buttons to edit the tree.
*/
class TreeEditFrame extends JFrame implements MouseListener
{
   public TreeEditFrame()
   {  
      setTitle("TreeEditTest");
      setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);      // construct tree      TreeNode root = makeSampleTree();
      model = new DefaultTreeModel(root);
      tree = new JTree(model);
      tree.setEditable(true);
      tree.addMouseListener(this);      // add scroll pane with tree      JScrollPane scrollPane = new JScrollPane(tree);
      add(scrollPane, BorderLayout.CENTER);      makeButtons();
      pop = new JPopupMenu();
      JMenuItem addChild,deleteNode;
      addChild = new JMenuItem("添加");
      
      addChild.addActionListener(new
         ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode)
                  tree.getLastSelectedPathComponent();               if (selectedNode == null) return;               DefaultMutableTreeNode newNode = new DefaultMutableTreeNode("New");
               model.insertNodeInto(newNode, selectedNode, selectedNode.getChildCount());               // now display new node
               
               TreeNode[] nodes = model.getPathToRoot(newNode);
               TreePath path = new TreePath(nodes);
               tree.scrollPathToVisible(path);
            }
         });
      
      deleteNode = new JMenuItem("删除");
      
       deleteNode.addActionListener(new
         ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               DefaultMutableTreeNode selectedNode
                  = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();               if (selectedNode != null && selectedNode.getParent() != null)
                  model.removeNodeFromParent(selectedNode);
            }
         });
      
      pop.add(addChild);
      pop.add(deleteNode);
   }   public TreeNode makeSampleTree()
   {  
      DefaultMutableTreeNode root = new DefaultMutableTreeNode("World");
      DefaultMutableTreeNode country = new DefaultMutableTreeNode("USA");
      root.add(country);
      DefaultMutableTreeNode state = new DefaultMutableTreeNode("California");
      country.add(state);
      DefaultMutableTreeNode city = new DefaultMutableTreeNode("San Jose");
      state.add(city);
      city = new DefaultMutableTreeNode("San Diego");
      state.add(city);
      state = new DefaultMutableTreeNode("Michigan");
      country.add(state);
      city = new DefaultMutableTreeNode("Ann Arbor");
      state.add(city);
      country = new DefaultMutableTreeNode("Germany");
      root.add(country);
      state = new DefaultMutableTreeNode("Schleswig-Holstein");
      country.add(state);
      city = new DefaultMutableTreeNode("Kiel");
      state.add(city);
      return root;
   }   /**
      Makes the buttons to add a sibling, add a child, and
      delete a node.
   */
   public void makeButtons()
   {
      JPanel panel = new JPanel();
      JButton addSiblingButton = new JButton("Add Sibling");
      addSiblingButton.addActionListener(new
         ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               DefaultMutableTreeNode selectedNode
                  = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();               if (selectedNode == null) return;               DefaultMutableTreeNode parent
                  = (DefaultMutableTreeNode) selectedNode.getParent();               if (parent == null) return;               DefaultMutableTreeNode newNode = new DefaultMutableTreeNode("New");               int selectedIndex = parent.getIndex(selectedNode);
               model.insertNodeInto(newNode, parent, selectedIndex + 1);
         
               // now display new node
               
               TreeNode[] nodes = model.getPathToRoot(newNode);
               TreePath path = new TreePath(nodes);
               tree.scrollPathToVisible(path);
            }
         });
      panel.add(addSiblingButton);      JButton addChildButton = new JButton("Add Child");
      addChildButton.addActionListener(new
         ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode)
                  tree.getLastSelectedPathComponent();               if (selectedNode == null) return;               DefaultMutableTreeNode newNode = new DefaultMutableTreeNode("New");
               model.insertNodeInto(newNode, selectedNode, selectedNode.getChildCount());               // now display new node
               
               TreeNode[] nodes = model.getPathToRoot(newNode);
               TreePath path = new TreePath(nodes);
               tree.scrollPathToVisible(path);
            }
         });
      panel.add(addChildButton);      JButton deleteButton = new JButton("Delete");
      deleteButton.addActionListener(new
         ActionListener()
         {
            public void actionPerformed(ActionEvent event)
            {
               DefaultMutableTreeNode selectedNode
                  = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();               if (selectedNode != null && selectedNode.getParent() != null)
                  model.removeNodeFromParent(selectedNode);
            }
         });
      panel.add(deleteButton);
      add(panel, BorderLayout.SOUTH);
   }
   
  public void mouseClicked(MouseEvent e) {
  }  public void mouseEntered(MouseEvent e) {
  }  public void mouseExited(MouseEvent e) {
  }  public void mousePressed(MouseEvent e) {
   if (e.getButton() == MouseEvent.BUTTON3) {
   
    pop.show(this, e.getX(), e.getY()+20);
   }
  }  public void mouseReleased(MouseEvent e) {
  }
   private JPopupMenu pop;
   private DefaultTreeModel model;
   private JTree tree;
   private static final int DEFAULT_WIDTH = 400;
   private static final int DEFAULT_HEIGHT = 200;
}本文部分参考了《Java核心技术》卷2和mq612（五斗米)的blog,特此声明