【原创】Java的树形控件JTree更换节点图标_Tryven

http://blog.sina.com.cn/u/2918511833

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【原创】Java的树形控件JTree更换节点图标

(2014-01-03 16:19:35)

标签：

java

jtree节点图标更换

jtree的windows风格

jtree

分类： JavaSE开源共享

使用Java的树形控件 JTree 的时候总感觉图标很不习惯，还是喜欢Windows风格，所以整理了 3 种美化JTree节点图标的方法。

方法一（推荐）：通过修改 UIManager 中的属性值来更换图片，下面贴出我的源代码

http://s1/mw690/003bvMfvgy6FvadT3oI20&690 http://s3/mw690/003bvMfvgy6FvadXrcm62&690

import javax.swing.Icon;

import javax.swing.ImageIcon;

import javax.swing.JFrame;

import javax.swing.JTree;

import javax.swing.UIManager;

import javax.swing.event.TreeSelectionEvent;

import javax.swing.event.TreeSelectionListener;

import javax.swing.tree.DefaultMutableTreeNode;

public class TreeDemo {

public TreeDemo() {

Icon icon1 = new ImageIcon("collapsed.gif");

Icon icon2 = new ImageIcon("expanded.gif");

Icon icon3 = new ImageIcon("open.gif");

Icon icon4 = new ImageIcon("close.gif");

Icon icon5 = new ImageIcon("leaf.gif");

UIManager.put("Tree.collapsedIcon", icon1); //关键语句1

UIManager.put("Tree.expandedIcon", icon2); //关键语句2

UIManager.put("Tree.openIcon", icon3); //关键语句3

UIManager.put("Tree.closedIcon", icon4); //关键语句4

UIManager.put("Tree.leafIcon", icon5); //关键语句5

DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("Fruit");

node1.add(new DefaultMutableTreeNode(new User("Apple")));

node1.add(new DefaultMutableTreeNode(new User("Orange")));

DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("Drink");

node2.add(new DefaultMutableTreeNode(new User("Tea")));

node2.add(new DefaultMutableTreeNode(new User("Coffee")));

node2.add(new DefaultMutableTreeNode(new User("OX")));

DefaultMutableTreeNode top = new DefaultMutableTreeNode("Root");

top.add(new DefaultMutableTreeNode(new User("Example")));

top.add(node1);

top.add(node2);

final JTree tree = new JTree(top);

JFrame f = new JFrame("JTreeDemo");

f.add(tree);

f.setSize(300, 300);

f.setLocationRelativeTo(null);

f.setVisible(true);

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

// 添加选择事件

tree.addTreeSelectionListener(new TreeSelectionListener() {

@Override

public void valueChanged(TreeSelectionEvent e) {

DefaultMutableTreeNode node = (DefaultMutableTreeNode) tree

.getLastSelectedPathComponent();

if (node == null)

return;

Object object = node.getUserObject();

if (node.isLeaf()) {

User user = (User) object;

System.out.println("You have chosen:" + user.toString());

}

});

}

public static void main(String[] args) {

new TreeDemo();

}

class User {

private String name;

public User(String n) {

name = n;

}

public String toString() {

return name;

}

方法二：通过重写JTree来实现扩张功能（不过没有了+、- 号图标）

具体实现的资料参考：http://blog.163.com/sean_zwx/blog/static/169032755201053025122220/

http://s6/mw690/003bvMfvgy6FvaAU2BTb5&690

//T.java 第一个类

import java.awt.BorderLayout;

import java.awt.Dimension;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import javax.swing.Icon;

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 T {

JFrame frame;

public T() {

try {

UIManager

.setLookAndFeel("com.jtattoo.plaf.bernstein.BernsteinLookAndFeel");

SwingUtilities.updateComponentTreeUI(frame);

} catch (Exception e) {

}

frame = new JFrame("树");

frame.setSize(150, 300);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Icon icon1 = new ImageIcon("images/elbow-end-plus-nl.gif");

Icon icon2 = new ImageIcon("images/elbow-minus.gif");

UIManager.put("Tree.collapsedIcon", icon1);

UIManager.put("Tree.expandedIcon", icon2);

IconNode root1 = new IconNode(new ImageIcon("images/folder-open.gif"),

"高中同学");

IconNode root2 = new IconNode(new ImageIcon("images/folder-open.gif"),

"初中同学");

root1.add(new IconNode(new ImageIcon("images/folder.gif"), "雅君"));

root1.add(new IconNode(new ImageIcon("images/folder.gif"), "伟旭"));

root1.add(new IconNode(new ImageIcon("images/folder.gif"), "宜群"));

root2.add(new IconNode(new ImageIcon("images/folder.gif"), "彬强"));

root2.add(new IconNode(new ImageIcon("images/folder.gif"), "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

DefaultTreeCellRenderer cellRenderer = (DefaultTreeCellRenderer) tree

.getCellRenderer();// 获取该树的Renderer

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

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

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

tree.expandRow(0);

tree.expandRow(4);

// 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("images/folder.gif"));// 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.setSize(new Dimension(300, 400));

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

frame.setVisible(true);

frame.setLocationRelativeTo(null);

}

public static void main(String[] args) {

new T();

}

//IconNodeRenderer.java 第二个类

import javax.swing.Icon;

import javax.swing.ImageIcon;

import javax.swing.JTree;

import javax.swing.UIManager;

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;

}

// 定义节点类

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;

}

方法三：如果是Windows系统，直接调用本机皮肤风格

在public static void main(String[] args)开头加入

try {

UIManager.setLookAndFeel(lookAndFeel);

} catch (Exception e) {

e.printStackTrace();

}

具体实现的资料参考：http://zhidao.baidu.com/question/287155016.html

http://s9/mw690/003bvMfvgy6FvbdvYKIf8&690

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