java swing的樹操作（增刪改）

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 {

//增加帶滾動條容器  
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);

    //退出時需要終止當前jvm
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

//設置當前窗口的信息
private void init() {
    getContentPane().setLayout(null);
    setTitle("樹操作");
}

//初始化景點分類樹
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();
}

//右鍵點擊分類導航樹的菜單
private void popMenuInit() {
    popMenu = new JPopupMenu();
    JMenuItem addItem = new JMenuItem("添加");
    addItem.addActionListener(new TreeAddViewMenuEvent(this));
    JMenuItem delItem = new JMenuItem("刪除");
    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);
}

/**
 * 完全展開一個JTree
 *
 * @param tree JTree
 */
public void expandTree() {
    DefaultMutableTreeNode root = new DefaultMutableTreeNode("根節點");
    tree = new JTree(root);

    tree.addTreeSelectionListener(new TreeSelectionListener() {

        public void valueChanged(TreeSelectionEvent e) { //選中菜單節點的事件
            DefaultMutableTreeNode node = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();
        }
    });
    tree.updateUI();
    jScrollPane1.getViewport().add(tree);
}

/**
 * 獲取圖片文件內容
 *
 * @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點擊右鍵的增加處理
 */
class TreeAddViewMenuEvent implements ActionListener {

    private MyTree adaptee;

    public TreeAddViewMenuEvent(MyTree adaptee) {
        this.adaptee = adaptee;
    }

    public void actionPerformed(ActionEvent e) {
        String name = JOptionPane.showInputDialog("請輸入分類節點名稱：");
        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點擊右鍵的刪除處理
 */
class TreeDeleteViewMenuEvent implements ActionListener {

    private MyTree adaptee;

    public TreeDeleteViewMenuEvent(MyTree adaptee) {
        this.adaptee = adaptee;
    }

    public void actionPerformed(ActionEvent e) {
        int conform = JOptionPane.showConfirmDialog(null, "是否確認刪除？", "刪除景點確認", 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點擊右鍵的修改處理
*/
class TreeModifyViewMenuEvent implements ActionListener {
private MyTree adaptee;
public TreeModifyViewMenuEvent(MyTree adaptee) {

 this.adaptee = adaptee;

}
public void actionPerformed(ActionEvent e) {

 String name = JOptionPane.showInputDialog("請輸入新分類節點名稱：");

 DefaultMutableTreeNode node = (DefaultMutableTreeNode) this.adaptee.getTree().getSelectionPath().getLastPathComponent();
 //改名 
 node.setUserObject(name);
 //刷新 
 this.adaptee.getTree().updateUI();

}
}


/**

菜單點擊右鍵的事件處理
*/
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()); // 關鍵是這個方法的使用
 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);
 }

}
}</pre>轉自:http://blog.csdn.net/zhongweijian/article/details/7668909