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);          }      }  }