树节点监听节点改变Demo

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/* * @(#)NewClass.java2016-08-04 * * Copyright 2010 Fiberhome. All rights reserved. */package treetest;import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.event.*;import javax.swing.tree.*;public class TreeDemo5 implements TreeModelListener {    JLabel label = null;    String nodeName = null; //原有節點名稱    public TreeDemo5() {//         try {//       // // AlloyLookAndFeel.setProperty("alloy.isLookAndFeelFrameDecoration", "true");//  //        AlloyTheme theme = new BedouinTheme();//設置界面的外觀，手冊中////   //       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("資源管理器");        DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("文件夾");        DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("我的電腦");        DefaultMutableTreeNode node3 = new DefaultMutableTreeNode("收藏夾");        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("個人信件");        node1.add(leafnode);        leafnode = new DefaultMutableTreeNode("私人文件");        node1.add(leafnode);        leafnode = new DefaultMutableTreeNode("本機磁盤(C:)");        node2.add(leafnode);        leafnode = new DefaultMutableTreeNode("本機磁盤(D:)");        node2.add(leafnode);        leafnode = new DefaultMutableTreeNode("本機磁盤(E:)");        node2.add(leafnode);        DefaultMutableTreeNode node31 = new DefaultMutableTreeNode("網站列表");        node3.add(node31);        leafnode = new DefaultMutableTreeNode("天勤網站");        node31.add(leafnode);        leafnode = new DefaultMutableTreeNode("足球消息");        node31.add(leafnode);        leafnode = new DefaultMutableTreeNode("網絡書店");        node31.add(leafnode);        JTree tree = new JTree(root);        tree.setEditable(true);//設置JTree為可編輯的        tree.addMouseListener(new MouseHandle());//使Tree加入檢測Mouse事件，以便取得節點名稱        //下面兩行取得DefaultTreeModel,並檢測是否有TreeModelEvent事件.        DefaultTreeModel treeModel = (DefaultTreeModel) tree.getModel();        treeModel.addTreeModelListener(this);        JScrollPane scrollPane = new JScrollPane();        scrollPane.setViewportView(tree);        label = new JLabel("更改數據為: ");        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);            }        });    }    /*本方法實作TreeModelListener介面，本介面共定義四個方法，分別TreeNodesChanged()     *treeNodesInserted()、treeNodesRemoved()、treeNodesRemoved()、     *treeStructureChanged().在此範例中我們只針對更改節點值的部份，因此    只實作     *treeNodesChanged()方法.     */    public void treeNodesChanged(TreeModelEvent e) {        TreePath treePath = e.getTreePath();        System.out.println(treePath);        //下面這行由TreeModelEvent取得的DefaultMutableTreeNode為節點的父節點，而不是用戶點選        //的節點，這點讀者要特別注意。要取得真正的節點需要再加寫下面6行代碼.        DefaultMutableTreeNode node = (DefaultMutableTreeNode) treePath.getLastPathComponent();        try {            //getChildIndices()方法會返回目前修改節點的索引值。由於我們只修改一個節點，因此節點索引值就放在index[0]            //的位置，若點選的節點為root node,則getChildIndices()的返回值為null,程式下面的第二行就在處理點選root            //node產生的NullPointerException問題.            int[] index = e.getChildIndices();            //由DefaultMutableTreeNode類的getChildAt()方法取得修改的節點對象.            node = (DefaultMutableTreeNode) node.getChildAt(index[0]);        } catch (NullPointerException exc) {        }        //由DefaultMutableTreeNode類getUserObject()方法取得節點的內容，或是寫成node.toString()亦相同.        label.setText(nodeName + "更改數據為: " + (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();    }    //處理Mouse點選事件    class MouseHandle extends MouseAdapter {        public void mousePressed(MouseEvent e) {            try {                JTree tree = (JTree) e.getSource();                //JTree的getRowForLocation()方法會返回節點的列索引值。例如本例中，“本機磁盤(D:)”的列索引值為4,此索引值                //會隨着其他數據夾的打開或收起而變支，但“資源管理器”的列索引值恆為0.                int rowLocation = tree.getRowForLocation(e.getX(), e.getY());                /*JTree的getPathForRow()方法會取得從root node到點選節點的一                                        條path,此path為一條直線，如程式運行的圖示                                       *若你點選“本機磁盤(E:)”,則Tree Path為"資源管理器"-->"我的                                        電腦"-->"本機磁盤(E:)",因此利用TreePath                                        *的getLastPathComponent()方法就可以取得所點選的節點.                                     */                TreePath treepath = tree.getPathForRow(rowLocation);                TreeNode treenode = (TreeNode) treepath.getLastPathComponent();                nodeName = treenode.toString();            } catch (NullPointerException ne) {            }        }    }}
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