关于JTree组件控制上的问题，望jave界面设计高手帮忙解答

Question

别的不好说，还没仔细看，是不是应该考虑后台的Model对象啊？

Answer 1

displayData和managerData是两个Vector

Answer 2

这个是不是做WINDOWS里面的目录树？

Answer 3

不是做已有文件的目录树，是自己建的树，怎么说呢？
就是和windows里面新建一个文件夹以后实时添加一个树的子节点差不多！！

Answer 4

找到一个例子程序，希望有帮助：import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;public class JTreeDemo extends JPanel implements ActionListener { private int newNodeSuffix = 1;
private static String ADD_COMMAND = "add";
private static String REMOVE_COMMAND = "remove";
private static String CLEAR_COMMAND = "clear";
    
private DynamicTree treePanel; public JTreeDemo() {
super(new BorderLayout());
treePanel = new DynamicTree();
populateTree(treePanel);
JButton addButton = new JButton("Add");
addButton.setActionCommand(ADD_COMMAND);
addButton.addActionListener(this);
JButton removeButton = new JButton("Remove");
removeButton.setActionCommand(REMOVE_COMMAND);
removeButton.addActionListener(this);
JButton clearButton = new JButton("Clear");
clearButton.setActionCommand(CLEAR_COMMAND);
clearButton.addActionListener(this);
treePanel.setPreferredSize(new Dimension(300, 150));
add(treePanel, BorderLayout.CENTER);
JPanel panel = new JPanel(new GridLayout(0,1));
panel.add(addButton);
panel.add(removeButton);
panel.add(clearButton);
add(panel, BorderLayout.LINE_END);
} public void populateTree(DynamicTree treePanel) {
String p1Name = new String("Parent 1");
String p2Name = new String("Parent 2");
String c1Name = new String("Child 1");
String c2Name = new String("Child 2");
DefaultMutableTreeNode p1, p2;
p1 = treePanel.addObject(null, p1Name);
p2 = treePanel.addObject(null, p2Name);
treePanel.addObject(p1, c1Name);
treePanel.addObject(p1, c2Name);
treePanel.addObject(p2, c1Name);
treePanel.addObject(p2, c2Name);
}
    
public void actionPerformed(ActionEvent e) {
String command = e.getActionCommand();
if (ADD_COMMAND.equals(command)) {
treePanel.addObject("New Node " + newNodeSuffix++);
} else if (REMOVE_COMMAND.equals(command)) {
treePanel.removeCurrentNode();
} else if (CLEAR_COMMAND.equals(command)) {
treePanel.clear();
}
} private static void createAndShowGUI() {
JFrame.setDefaultLookAndFeelDecorated(true);
JFrame frame = new JFrame("JTreeDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTreeDemo newContentPane = new JTreeDemo();
newContentPane.setOpaque(true);
frame.setContentPane(newContentPane);
frame.pack();
frame.setVisible(true);
} public static void main(String[] args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}final class DynamicTree extends JPanel {
protected DefaultMutableTreeNode rootNode;
protected DefaultTreeModel treeModel;
protected JTree tree;
private Toolkit toolkit = Toolkit.getDefaultToolkit(); public DynamicTree() {
super(new GridLayout(1,0));
rootNode = new DefaultMutableTreeNode("Root Node");
treeModel = new DefaultTreeModel(rootNode);
treeModel.addTreeModelListener(new MyTreeModelListener());
tree = new JTree(treeModel);
tree.setEditable(true);
tree.getSelectionModel().setSelectionMode
(TreeSelectionModel.SINGLE_TREE_SELECTION);
tree.setShowsRootHandles(true);
JScrollPane scrollPane = new JScrollPane(tree);
add(scrollPane);
} public void clear() {
rootNode.removeAllChildren();
treeModel.reload();
} public void removeCurrentNode() {
TreePath currentSelection = tree.getSelectionPath();
if (currentSelection != null) {
DefaultMutableTreeNode currentNode = (DefaultMutableTreeNode)
 (currentSelection.getLastPathComponent());
MutableTreeNode parent = (MutableTreeNode)(currentNode.getParent());
if (parent != null) {
treeModel.removeNodeFromParent(currentNode);
return;
}
} 
toolkit.beep();
} public DefaultMutableTreeNode addObject(Object child) {
DefaultMutableTreeNode parentNode = null;
TreePath parentPath = tree.getSelectionPath();
if (parentPath == null) {
parentNode = rootNode;
} else {
parentNode = (DefaultMutableTreeNode)
 (parentPath.getLastPathComponent());
}
return addObject(parentNode, child, true);
} public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent,
Object child) {
return addObject(parent, child, false);
} public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent,
Object child, 
boolean shouldBeVisible) {
DefaultMutableTreeNode childNode = 
new DefaultMutableTreeNode(child);
if (parent == null) {
parent = rootNode;
}
treeModel.insertNodeInto(childNode, parent, 
 parent.getChildCount());
if (shouldBeVisible) {
tree.scrollPathToVisible(new TreePath(childNode.getPath()));
}
return childNode;
} class MyTreeModelListener implements TreeModelListener {
public void treeNodesChanged(TreeModelEvent e) {
DefaultMutableTreeNode node;
node = (DefaultMutableTreeNode)
 (e.getTreePath().getLastPathComponent());
try {
int index = e.getChildIndices()[0];
node = (DefaultMutableTreeNode)
 (node.getChildAt(index));
} catch (NullPointerException exc) {}
System.out.println("The user has finished editing the node.");
System.out.println("New value: " + node.getUserObject());
}
public void treeNodesInserted(TreeModelEvent e) {
}
public void treeNodesRemoved(TreeModelEvent e) {
}
public void treeStructureChanged(TreeModelEvent e) {
}
}
}

Answer 5

因为用了TAB，格式贴出来有点难看，自己再贴一下吧。

Answer 6

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;public class JTreeDemo extends JPanel implements ActionListener {  private int newNodeSuffix = 1;
  private static String ADD_COMMAND = "add";
  private static String REMOVE_COMMAND = "remove";
  private static String CLEAR_COMMAND = "clear";
    
  private DynamicTree treePanel;  public JTreeDemo() {
      super(new BorderLayout());
      treePanel = new DynamicTree();
      populateTree(treePanel);
      JButton addButton = new JButton("Add");
      addButton.setActionCommand(ADD_COMMAND);
      addButton.addActionListener(this);
      JButton removeButton = new JButton("Remove");
      removeButton.setActionCommand(REMOVE_COMMAND);
      removeButton.addActionListener(this);
      JButton clearButton = new JButton("Clear");
      clearButton.setActionCommand(CLEAR_COMMAND);
      clearButton.addActionListener(this);
      treePanel.setPreferredSize(new Dimension(300, 150));
      add(treePanel, BorderLayout.CENTER);
      JPanel panel = new JPanel(new GridLayout(0,1));
      panel.add(addButton);
      panel.add(removeButton);
      panel.add(clearButton);
      add(panel, BorderLayout.LINE_END);
  }  public void populateTree(DynamicTree treePanel) {
      String p1Name = new String("Parent 1");
      String p2Name = new String("Parent 2");
      String c1Name = new String("Child 1");
      String c2Name = new String("Child 2");
      DefaultMutableTreeNode p1, p2;
      p1 = treePanel.addObject(null, p1Name);
      p2 = treePanel.addObject(null, p2Name);
      treePanel.addObject(p1, c1Name);
      treePanel.addObject(p1, c2Name);
      treePanel.addObject(p2, c1Name);
      treePanel.addObject(p2, c2Name);
  }
    
  public void actionPerformed(ActionEvent e) {
      String command = e.getActionCommand();
      if (ADD_COMMAND.equals(command)) {
          treePanel.addObject("New Node " + newNodeSuffix++);
      } else if (REMOVE_COMMAND.equals(command)) {
          treePanel.removeCurrentNode();
      } else if (CLEAR_COMMAND.equals(command)) {
          treePanel.clear();
      }
  }  private static void createAndShowGUI() {
      JFrame.setDefaultLookAndFeelDecorated(true);
      JFrame frame = new JFrame("JTreeDemo");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      JTreeDemo newContentPane = new JTreeDemo();
      newContentPane.setOpaque(true);
      frame.setContentPane(newContentPane);
      frame.pack();
      frame.setVisible(true);
  }  public static void main(String[] args) {
      javax.swing.SwingUtilities.invokeLater(new Runnable() {
          public void run() {
              createAndShowGUI();
          }
      });
  }
}final class DynamicTree extends JPanel {
    protected DefaultMutableTreeNode rootNode;
    protected DefaultTreeModel treeModel;
    protected JTree tree;
    private Toolkit toolkit = Toolkit.getDefaultToolkit();    public DynamicTree() {
        super(new GridLayout(1,0));
        rootNode = new DefaultMutableTreeNode("Root Node");
        treeModel = new DefaultTreeModel(rootNode);
        treeModel.addTreeModelListener(new MyTreeModelListener());
        tree = new JTree(treeModel);
        tree.setEditable(true);
        tree.getSelectionModel().setSelectionMode
                (TreeSelectionModel.SINGLE_TREE_SELECTION);
        tree.setShowsRootHandles(true);
        JScrollPane scrollPane = new JScrollPane(tree);
        add(scrollPane);
    }    public void clear() {
        rootNode.removeAllChildren();
        treeModel.reload();
    }    public void removeCurrentNode() {
        TreePath currentSelection = tree.getSelectionPath();
        if (currentSelection != null) {
            DefaultMutableTreeNode currentNode = (DefaultMutableTreeNode)
                         (currentSelection.getLastPathComponent());
            MutableTreeNode parent = (MutableTreeNode)(currentNode.getParent());
            if (parent != null) {
                treeModel.removeNodeFromParent(currentNode);
                return;
            }
        } 
        toolkit.beep();
    }    public DefaultMutableTreeNode addObject(Object child) {
        DefaultMutableTreeNode parentNode = null;
        TreePath parentPath = tree.getSelectionPath();
        if (parentPath == null) {
            parentNode = rootNode;
        } else {
            parentNode = (DefaultMutableTreeNode)
                         (parentPath.getLastPathComponent());
        }
        return addObject(parentNode, child, true);
    }    public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent,
                                            Object child) {
        return addObject(parent, child, false);
    }    public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent,
                                            Object child, 
                                            boolean shouldBeVisible) {
        DefaultMutableTreeNode childNode = 
                new DefaultMutableTreeNode(child);
        if (parent == null) {
            parent = rootNode;
        }
        treeModel.insertNodeInto(childNode, parent, 
                                 parent.getChildCount());
        if (shouldBeVisible) {
            tree.scrollPathToVisible(new TreePath(childNode.getPath()));
        }
        return childNode;
    }    class MyTreeModelListener implements TreeModelListener {
        public void treeNodesChanged(TreeModelEvent e) {
            DefaultMutableTreeNode node;
            node = (DefaultMutableTreeNode)
                     (e.getTreePath().getLastPathComponent());
            try {
                int index = e.getChildIndices()[0];
                node = (DefaultMutableTreeNode)
                       (node.getChildAt(index));
            } catch (NullPointerException exc) {}
            System.out.println("The user has finished editing the node.");
            System.out.println("New value: " + node.getUserObject());
        }
        public void treeNodesInserted(TreeModelEvent e) {
        }
        public void treeNodesRemoved(TreeModelEvent e) {
        }
        public void treeStructureChanged(TreeModelEvent e) {
        }
    }
}