怎么通过jtree叶子结点的TreePath得到叶子的ID
package com.MyQQ.test;import java.awt.Color;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.awt.event.MouseListener;import java.io.IOException;import javax.swing.ImageIcon;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JScrollPane;import javax.swing.JTabbedPane;import javax.swing.JTextField;import javax.swing.JTree;import javax.swing.tree.DefaultMutableTreeNode;import javax.swing.tree.DefaultTreeModel;import javax.swing.tree.TreePath;/** * @author * 2012-4-9 */public class ShowFriend { JFrame showfriend=new JFrame(); String string; public void init(String string){ //public void init(){ showfriend.setBounds(800, 50, 290,716); showfriend.setBackground(Color.blue); JPanel p1=new JPanel(); JLabel label1=new JLabel(); JLabel label2=new JLabel(); JLabel label3=new JLabel(); JLabel label4=new JLabel(); JTextField tf1=new JTextField(15); JTextField tf2=new JTextField(25); JButton btn1=new JButton(); //让label2显示网名 String strNick; strNick=new QQDB().showNick(string); label2.setText( strNick); tf1.setText("编辑个性签名"); tf2.setText("请输入你要查询的内容"); label1.setIcon(new ImageIcon(".\\src\\image\\headlog.jpg")); label3.setIcon(new ImageIcon(".\\src\\image\\weather.png")); label4.setIcon(new ImageIcon(".\\src\\image\\QQZone.png")); btn1.setIcon(new ImageIcon(".\\src\\image\\search.png")); //想要在这个panel里用setbounds必须先把p1的布局设置空 //各个组件如果都在一个面板中以左上角为起始点 //为各个组件设置布局 p1.setLayout(null); label1.setBounds(0, 16, 79, 81); label1.setBorder(null); label2.setBounds(91,16, 124, 20); tf1.setBounds(91, 45, 128, 20); label3.setBounds(225, 16, 56, 54); label4.setBounds(91, 76, 189, 22); tf2.setBounds(0, 106, 240, 25); btn1.setBounds(243, 106, 32, 22); btn1.setBorder(null); btn1.addActionListener(new MyAction()); //JTabbedPane允许用户通过单击具有给定标题和/或图标的选项卡，在一组组件之间进行切换 JTabbedPane tPane=new JTabbedPane(JTabbedPane.TOP); tPane.setBounds(0, 126, 290, 543); String str3=new QQDB().getTableName(string); //创建树,设置node为这个树的根结点,并且名字为root System.out.println("1"); final DefaultMutableTreeNode node=new DefaultMutableTreeNode("root"); final JTree tree=new JTree(node); System.out.println("2"); //调用数据库里面的添加子节点的方法添加节点到根下面 new QQDB().createNode(node, "0",str3); System.out.println("4"); //把父子结点之间的连线去掉 tree.putClientProperty("JTree.lineStyle", "None"); //tree.setRootVisible(false); //tree.putClientProperty("JTree.lineStyle", "Angled"); 用来保留连线，其实默认值也是保留连线的 //tree.setShowsRootHandles(true); 用来添加把手 //tree.setRootVisible(false); //JScrollPane 管理视口、可选的垂直和水平滚动条以及可选的行和列标题视口 JScrollPane jsp1=new JScrollPane(tree); JScrollPane jsp2=new JScrollPane(); JScrollPane jsp3=new JScrollPane(); JScrollPane jsp4=new JScrollPane(); JScrollPane jsp5=new JScrollPane(); //添加jscrollpanel并且为它们添加图标 tPane.addTab(null,new ImageIcon(".\\src\\image\\1.jpg"),jsp1); tPane.addTab(null,new ImageIcon(".\\src\\image\\2.jpg"),jsp2); tPane.addTab(null,new ImageIcon(".\\src\\image\\3.jpg"),jsp3); tPane.addTab(null,new ImageIcon(".\\src\\image\\4.jpg"),jsp4); tPane.addTab(null,new ImageIcon(".\\src\\image\\5.jpg"),jsp5); tPane.setBorder(null); jsp1.setBorder(null); jsp2.setBorder(null); jsp3.setBorder(null); jsp4.setBorder(null); jsp5.setBorder(null); MouseListener ml = new MouseAdapter() { public void mousePressed(MouseEvent e) { int selRow = tree.getRowForLocation(e.getX(), e.getY()); TreePath selPath = tree.getPathForLocation(e.getX(), e.getY()); if(selRow != -1) { if(e.getClickCount() == 1) { mySingleClick(selRow, selPath); } else if(e.getClickCount() == 2) { myDoubleClick(selRow, selPath); } } } private void myDoubleClick(int selRow, TreePath selPath) { //判断是不是最后的节点,用路径值看是不是数据库里面要求的第三级 if (selPath.getPathCount()==3) { ???????????这里怎么拿到叶子的ID呢，现在可以拿到的只是name //把当前节点的Id传递进去 new DialogJFrame(); //selPath.getLastPathComponent()得到的是节点name,通过这个name去查ID System.out.println(selPath.getLastPathComponent()); System.out.println(selPath); System.out.println("--------------"); }else { //打开下面的子节点，不用写 } } private void mySingleClick(int selRow, TreePath selPath) { } }; tree.addMouseListener(ml); //p1.setBackground(Color.BLUE); p1.add(label1); p1.add(label2); p1.add(label3); p1.add(label4); p1.add(tf1); p1.add(tf2); p1.add(btn1); p1.add(tPane); showfriend.add(p1); showfriend.setVisible(true); showfriend.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } //public static void main(String[] args) { public void showfriend(String str){ this.string=str; //为了显示网名，我们把ID一直传下去，便于数据库的查询 init(string); //new ShowFriend(); }}//打开网页进行搜索class MyAction implements ActionListener{ public void actionPerformed(ActionEvent e) { try { Process process = Runtime.getRuntime().exec("explorer http://www.baidu.com"); } catch (IOException e3) { e3.printStackTrace(); } } } 数据库操作如下 //创建树遍历表里面的节点 public void createNode(DefaultMutableTreeNode parent, String ParentId,String string){ try { this.str1=string; if (str1.equals("adminfriend")) { DefaultMutableTreeNode temp=null; String sql="select friendId,name,ParentId from adminfriend where ParentID='" + ParentId + "'"; stmt=conn.createStatement(); res=stmt.executeQuery(sql); //定义光标位置 int i=0; while (res.next()) { i++; temp=new DefaultMutableTreeNode(res.getString("name")); parent.add(temp); createNode(temp, res.getString("friendId"),string); res=stmt.executeQuery(sql); res.relative(i); } }if (string.equals("rootfriend")) { DefaultMutableTreeNode temp=null; String sql="select friendId,name,ParentId from rootfriend where ParentID='" + ParentId + "'"; stmt=conn.createStatement(); res=stmt.executeQuery(sql); //定义光标位置 int i=0; while (res.next()) { i++; temp=new DefaultMutableTreeNode(res.getString("name")); parent.add(temp); createNode(temp, res.getString("friendId"),string); res=stmt.executeQuery(sql); res.relative(i); } } } catch (Exception e) { e.printStackTrace(); } }数据库如图