java swing的树操作（增删改）

import java.awt.Dimension;import java.awt.Image;import java.awt.Rectangle;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.MouseEvent;import java.awt.event.MouseListener;import java.io.BufferedInputStream;import java.io.FileInputStream;import java.io.IOException;import java.nio.ByteBuffer;import java.util.logging.Level;import java.util.logging.Logger;import javax.swing.*;import javax.swing.event.TreeSelectionEvent;import javax.swing.event.TreeSelectionListener;import javax.swing.tree.DefaultMutableTreeNode;import javax.swing.tree.TreePath;public class MyTree extends JFrame {    //增加带滚动条容器      private JScrollPane jScrollPane1 = new JScrollPane();    private JTree tree;    private JPopupMenu popMenu;    public JScrollPane getjScrollPane1() {        return jScrollPane1;    }    public void setjScrollPane1(JScrollPane jScrollPane1) {        this.jScrollPane1 = jScrollPane1;    }    public JPopupMenu getPopMenu() {        return popMenu;    }    public void setPopMenu(JPopupMenu popMenu) {        this.popMenu = popMenu;    }    public MyTree() {        try {            init();            treeInit();            popMenuInit();        } catch (Exception exception) {            exception.printStackTrace();        }        this.setSize(800, 600);        this.setResizable(true);        this.setMinimumSize(new Dimension(800, 600));        this.setLocationRelativeTo(null);        this.setVisible(true);        //退出时需要终止当前jvm        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    }    //设置当前窗口的信息    private void init() {        getContentPane().setLayout(null);        setTitle("树操作");    }    //初始化景点分类树    public void treeInit() {        if (jScrollPane1 != null) {            this.remove(jScrollPane1);        }        jScrollPane1.setBounds(new Rectangle(0, 0, 800, 600));        jScrollPane1.setAutoscrolls(true);        this.getContentPane().add(jScrollPane1);        expandTree();        tree.addMouseListener(new TreePopMenuEvent(this));        this.repaint();    }    //右键点击分类导航树的菜单    private void popMenuInit() {        popMenu = new JPopupMenu();        JMenuItem addItem = new JMenuItem("添加");        addItem.addActionListener(new TreeAddViewMenuEvent(this));        JMenuItem delItem = new JMenuItem("删除");        delItem.addActionListener(new TreeDeleteViewMenuEvent(this));        JMenuItem modifyItem = new JMenuItem("修改");        modifyItem.addActionListener(new TreeModifyViewMenuEvent(this));        popMenu.add(addItem);        popMenu.add(delItem);        popMenu.add(modifyItem);    }    /**     * 完全展开一个JTree     *     * @param tree JTree     */    public void expandTree() {        DefaultMutableTreeNode root = new DefaultMutableTreeNode("根节点");        tree = new JTree(root);        tree.addTreeSelectionListener(new TreeSelectionListener() {            public void valueChanged(TreeSelectionEvent e) { //选中菜单节点的事件                DefaultMutableTreeNode node = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();            }        });        tree.updateUI();        jScrollPane1.getViewport().add(tree);    }    /**     * 获取图片文件内容     *     * @param fileName     * @return     */    public Image getImage(String fileName) {        FileInputStream fis = null;        try {            fis = new FileInputStream(fileName);            BufferedInputStream bis = new BufferedInputStream(fis);            ByteBuffer bb = ByteBuffer.allocate(1024 * 1024);            byte[] buffer = new byte[1];            while (bis.read(buffer) > 0) {                bb.put(buffer);            }            ImageIcon icon = new ImageIcon(bb.array());            return icon.getImage();        } catch (IOException ex) {            Logger.getLogger(MyTree.class.getName()).log(Level.SEVERE, null, ex);        } finally {            try {                fis.close();            } catch (IOException ex) {                Logger.getLogger(MyTree.class.getName()).log(Level.SEVERE, null, ex);            }        }        return null;    }    public JTree getTree() {        return tree;    }    /**     * popmenu点击右键的增加处理     */    class TreeAddViewMenuEvent implements ActionListener {        private MyTree adaptee;        public TreeAddViewMenuEvent(MyTree adaptee) {            this.adaptee = adaptee;        }        public void actionPerformed(ActionEvent e) {            String name = JOptionPane.showInputDialog("请输入分类节点名称：");            DefaultMutableTreeNode treenode = new DefaultMutableTreeNode(name);            ((DefaultMutableTreeNode) this.adaptee.getTree().getLastSelectedPathComponent()).add(treenode);            this.adaptee.getTree().expandPath(new TreePath(((DefaultMutableTreeNode) this.adaptee.getTree().getLastSelectedPathComponent()).getPath()));            this.adaptee.getTree().updateUI();        }    }    /**     * popmenu点击右键的删除处理     */    class TreeDeleteViewMenuEvent implements ActionListener {        private MyTree adaptee;        public TreeDeleteViewMenuEvent(MyTree adaptee) {            this.adaptee = adaptee;        }        public void actionPerformed(ActionEvent e) {            int conform = JOptionPane.showConfirmDialog(null, "是否确认删除？", "删除景点确认", JOptionPane.YES_NO_OPTION);            if (conform == JOptionPane.YES_OPTION) {                DefaultMutableTreeNode parentNode = (DefaultMutableTreeNode) (((DefaultMutableTreeNode) this.adaptee.getTree().getLastSelectedPathComponent()).getParent());                ((DefaultMutableTreeNode) this.adaptee.getTree().getLastSelectedPathComponent()).removeFromParent();                this.adaptee.getTree().updateUI();            }        }    }}/** * popmenu点击右键的修改处理 */class TreeModifyViewMenuEvent implements ActionListener {    private MyTree adaptee;    public TreeModifyViewMenuEvent(MyTree adaptee) {        this.adaptee = adaptee;    }    public void actionPerformed(ActionEvent e) {        String name = JOptionPane.showInputDialog("请输入新分类节点名称：");        DefaultMutableTreeNode node = (DefaultMutableTreeNode) this.adaptee.getTree().getSelectionPath().getLastPathComponent();        //改名         node.setUserObject(name);        //刷新         this.adaptee.getTree().updateUI();    }}/** * 菜单点击右键的事件处理 */class TreePopMenuEvent implements MouseListener {    private MyTree adaptee;    public TreePopMenuEvent(MyTree adaptee) {        this.adaptee = adaptee;    }    public void mouseClicked(MouseEvent e) {    }    public void mousePressed(MouseEvent e) {        TreePath path = adaptee.getTree().getPathForLocation(e.getX(), e.getY()); // 关键是这个方法的使用        if (path == null) {            return;        }        adaptee.getTree().setSelectionPath(path);        if (e.getButton() == 3) {            adaptee.getPopMenu().show(adaptee.getTree(), e.getX(), e.getY());        }    }    public void mouseReleased(MouseEvent e) {    }    public void mouseEntered(MouseEvent e) {    }    public void mouseExited(MouseEvent e) {    }    public static void main(String[] args) {        try {            JFrame.setDefaultLookAndFeelDecorated(true);            UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");            MyTree userframe = new MyTree();        } catch (ClassNotFoundException ex) {            Logger.getLogger(MyTree.class.getName()).log(Level.SEVERE, null, ex);        } catch (InstantiationException ex) {            Logger.getLogger(MyTree.class.getName()).log(Level.SEVERE, null, ex);        } catch (IllegalAccessException ex) {            Logger.getLogger(MyTree.class.getName()).log(Level.SEVERE, null, ex);        } catch (UnsupportedLookAndFeelException ex) {            Logger.getLogger(MyTree.class.getName()).log(Level.SEVERE, null, ex);        }    }}