JTree使用

 package JTree;

 import java.awt.Component;

 import javax.swing.Icon;

 import javax.swing.JTree;

 import javax.swing.tree.DefaultMutableTreeNode;

 import javax.swing.tree.DefaultTreeCellRenderer;

 public class IconNodeRenderer extends DefaultTreeCellRenderer { //继承该类

     //重写该方法

     public Component getTreeCellRendererComponent(JTree tree, Object value,boolean sel,

     boolean expanded, boolean leaf, int row,boolean hasFocus){

         super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf,row, hasFocus); //调用父类的该方法

         Icon icon = ((IconNode) value).getIcon();//从节点读取图片

         String txt=((IconNode) value).getText(); //从节点读取文本

         setIcon(icon);//设置图片

         setText(txt);//设置文本

         return this;

     }

 }

 class IconNode extends DefaultMutableTreeNode {

     protected Icon icon;

     protected String txt;

     //只包含文本的节点构造

     public IconNode(String txt)

     {

         super();

         this.txt=txt;

     }

     //包含文本和图片的节点构造

     public IconNode(Icon icon,String txt)

     {

         super();

         this.icon = icon;

         this.txt = txt;

     }

     public void setIcon(Icon icon)

     {

         this.icon = icon;

     }

     public Icon getIcon()

     {

         return icon;

     }

     public void setText(String txt)

     {

         this.txt=txt;

     }

     public String getText()

     {

         return txt;

     }

 }

package JTree;

import java.awt.BorderLayout;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import javax.swing.ImageIcon;

import javax.swing.JFrame;

import javax.swing.JScrollPane;

import javax.swing.JTree;

import javax.swing.SwingUtilities;

import javax.swing.UIManager;

import javax.swing.tree.DefaultTreeCellRenderer;

import javax.swing.tree.TreePath;

public class text

{

JFrame frame;

public text()

{

frame=new JFrame("树");

frame.setSize(150,300);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

//java.net.URL imgURL=getClass().getResource("");

IconNode root1=new IconNode(new ImageIcon("images/3.jpg"),"高中同学");

IconNode root2=new IconNode(new ImageIcon("i"),"初中同学");

root1.add(new IconNode(new ImageIcon("5.png"),"雅君"));

root1.add(new IconNode(new ImageIcon("1.png"),"伟旭"));

root1.add(new IconNode(new ImageIcon("2.png"),"宜群"));

root2.add(new IconNode(new ImageIcon("2.png"),"彬强"));

root2.add(new IconNode(new ImageIcon("1.png"),"小强"));

IconNode Root=new IconNode(null,null);//定义根节点

Root.add(root1);//定义二级节点

Root.add(root2);//定义二级节点

final JTree tree = new JTree(Root);//定义树

tree.setCellRenderer(new IconNodeRenderer()); //设置单元格描述

tree.setEditable(false); //设置树是否可编辑

tree.setRootVisible(false);//设置树的根节点是否可视

tree.setToggleClickCount(1);//设置单击几次展开数节点

DefaultTreeCellRenderer cellRenderer=(DefaultTreeCellRenderer)tree.getCellRenderer();//获取该树的Renderer

cellRenderer.setClosedIcon(new ImageIcon("2.gif"));//关闭打开图标

cellRenderer.setOpenIcon(new ImageIcon("2.gif"));//设置展开图标

//测试事件

tree.addMouseListener(new MouseAdapter()

{

public void mouseClicked(MouseEvent e)

{

if(e.getClickCount()==2)//双击节点

{

TreePath path=tree.getSelectionPath();//获取选中节点路径

IconNode node=(IconNode)path.getLastPathComponent();//通过路径将指针指向该节点

if(node.isLeaf())//如果该节点是叶子节点

{

//DefaultTreeModel model=(DefaultTreeModel)tree.getModel();//获取该树的模型

//model.removeNodeFromParent(node);//从本树删除该节点

node.setIcon(new ImageIcon("3.png"));//修改该节点的图片

node.setText("双击");//修改该节点的文本

tree.repaint();//重绘更新树

System.out.println(node.getText());

}

else//不是叶子节点

{

}

}

}

});

JScrollPane sp = new JScrollPane(tree);

frame.getContentPane().add(sp, BorderLayout.CENTER);

frame.setVisible(true);

}

public static void main(String[] args)

{

new text();

}

}