JTree demo

JFrame居中
方法一：
setLocationRelativeTo(null);

注意：必须在整个frame初始化完成后再加上此语句，否则将显示在屏幕右下角

方法二：
private Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
/** 屏幕宽度 */
private int screenWidth = screenSize.width;
/** 屏幕高度 */
private int screenHeight = screenSize.height;
jFrame.setLocation((screenWidth - FRAME_WIDTH) / 2, (screenHeight - FRAME_HEIGHT) / 2);

package component.tree;

import java.awt.Dialog;

import java.awt.Dimension;

import java.awt.Point;

import java.awt.Toolkit;

import javax.swing.JDialog;

import javax.swing.JTree;

/*2015-5-26*/

public class MyDialog extends JDialog{

    private JTree tree=new JTree();

    public MyDialog(Dialog owner) {

        super(owner,true);

        setSize(800,600);

        add(tree);

        setLocation(getCenterPoint());

    }

    private Point getCenterPoint(){

        int windowWidth = this.getWidth(); //获得窗口宽

        int windowHeight = this.getHeight(); //获得窗口高

        Toolkit kit = Toolkit.getDefaultToolkit(); //定义工具包

        Dimension screenSize = kit.getScreenSize(); //获取屏幕的尺寸

        int screenWidth = screenSize.width; //获取屏幕的宽

        int screenHeight = screenSize.height; //获取屏幕的高

         return new Point(screenWidth / 2 - windowWidth / 2,  screenHeight / 2 - windowHeight / 2);//窗口居中时的x，y

    }

    public JTree getTree() {

        return tree;

    }

}

package component.tree;

import static common.SwingConsole.run;

import java.awt.HeadlessException;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.tree.DefaultMutableTreeNode;

import javax.swing.tree.DefaultTreeModel;

/*2015-5-26*/

public class Main extends JFrame {

    public Main() throws HeadlessException {

        super();

        JButton button=new JButton("OK");

        button.addActionListener(new ActionListener() {

            @Override

            public void actionPerformed(ActionEvent e) {

                MyDialog dlg=new MyDialog(null);

                DefaultMutableTreeNode root = new DefaultMutableTreeNode("资源管理器");

                DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("我的公文包");

                DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("我的电脑");

                DefaultMutableTreeNode node3 = new DefaultMutableTreeNode("收藏夹");

                DefaultMutableTreeNode node4 = new DefaultMutableTreeNode("Readme");

                DefaultTreeModel treeModel = new DefaultTreeModel(root);

                /*

                 * DefaultTreeModel类所提供的insertNodeInto()方法加入节点到父节点的数量.

                 * 利用DefaultMutableTreeNode类所提供的getChildCount()方法取得目前子节点的数量.

                 */

                treeModel.insertNodeInto(node1, root, root.getChildCount());

                treeModel.insertNodeInto(node2, root, root.getChildCount());

                treeModel.insertNodeInto(node3, root, root.getChildCount());

                treeModel.insertNodeInto(node4, root, root.getChildCount());

                DefaultMutableTreeNode leafnode = new DefaultMutableTreeNode("公司文件");

                // DefaultTreeModel类所提供的insertNodeInto()方法加入节点到父节点的数量.

                treeModel.insertNodeInto(leafnode, node1, node1.getChildCount());

                leafnode = new DefaultMutableTreeNode("个人信件");

                treeModel.insertNodeInto(leafnode, node1, node1.getChildCount());

                leafnode = new DefaultMutableTreeNode("私人文件");

                treeModel.insertNodeInto(leafnode, node1, node1.getChildCount());

                leafnode = new DefaultMutableTreeNode("本机磁盘(C:)");

                treeModel.insertNodeInto(leafnode, node2, node2.getChildCount());

                leafnode = new DefaultMutableTreeNode("本机磁盘(D:)");

                treeModel.insertNodeInto(leafnode, node2, node2.getChildCount());

                leafnode = new DefaultMutableTreeNode("本机磁盘(E:)");

                treeModel.insertNodeInto(leafnode, node2, node2.getChildCount());

                DefaultMutableTreeNode node31 = new DefaultMutableTreeNode("网站列表");

                treeModel.insertNodeInto(node31, node3, node3.getChildCount());

                leafnode = new DefaultMutableTreeNode("奇摩站");

                treeModel.insertNodeInto(leafnode, node3, node3.getChildCount());

                leafnode = new DefaultMutableTreeNode("职棒消息");

                treeModel.insertNodeInto(leafnode, node3, node3.getChildCount());

                leafnode = new DefaultMutableTreeNode("网络书店");

                treeModel.insertNodeInto(leafnode, node3, node3.getChildCount());

                dlg.getTree().setModel(treeModel);

                dlg.setVisible(true);

            }

        });

        add(button);

    }

    public static void main(String[] args) {

        run(new Main(),200,100);

    }

}

package common;

import javax.swing.JFrame;

import javax.swing.SwingUtilities;

/*2015-5-26*/

public class SwingConsole {

    public static void run(final JFrame frame,final int width,final int height){

        SwingUtilities.invokeLater(new Runnable() {

            @Override

            public void run() {

                frame.setSize(width, height);

                frame.setTitle(frame.getClass().getSimpleName());

                frame.setVisible(true);

            }

        });

    }

}

http://www.iteedu.com/plang/java/jtswingchxshj/56.php

http://www.blogjava.net/santicom/archive/2011/03/23/346796.html

http://www.cnblogs.com/happyPawpaw/archive/2013/01/10/2854675.html

http://etwo.iteye.com/blog/1458414

package swing.tree;

import static common.SwingConsole.run;

import javax.swing.JFrame;

import javax.swing.JTree;

import javax.swing.tree.DefaultMutableTreeNode;

import javax.swing.tree.DefaultTreeModel;

/*2015-6-1*/

public class JTreeDemo extends JFrame{

    private static final long serialVersionUID = 1L;

    public JTreeDemo() {

        JTree tree=new JTree();

/*        DefaultMutableTreeNode root=new DefaultMutableTreeNode("我的电脑");

        DefaultMutableTreeNode c=new DefaultMutableTreeNode("C:");

        DefaultMutableTreeNode d=new DefaultMutableTreeNode("D:");

        DefaultMutableTreeNode c1=new DefaultMutableTreeNode("C1");

        DefaultMutableTreeNode c2=new DefaultMutableTreeNode("C2");*/

        Dir dir=new Dir("root", "My computer", "Y");

        Dir c=new Dir("C:", "第一个盘", "N");

        Dir d=new Dir("D:", "第二个盘", "Y");

        Dir c1=new Dir("c1", "盘一C1", "Y");

        Dir c2=new Dir("c2", "盘一C2", "Y");

        DefaultMutableTreeNode root=new DefaultMutableTreeNode(dir);

        DefaultMutableTreeNode cNode=new DefaultMutableTreeNode(c);

        DefaultMutableTreeNode dNode=new DefaultMutableTreeNode(d);

        DefaultMutableTreeNode c1Node=new DefaultMutableTreeNode(c1);

        DefaultMutableTreeNode c2Node=new DefaultMutableTreeNode(c2);

        DefaultTreeModel model=new DefaultTreeModel(root);

        model.insertNodeInto(cNode, root, root.getChildCount());

        model.insertNodeInto(dNode, root, root.getChildCount());

        model.insertNodeInto(c1Node, cNode,cNode.getChildCount());

        model.insertNodeInto(c2Node, cNode, cNode.getChildCount());

        tree.setModel(model);

        this.add(tree);

        tree.setSize(400, 200);

    }

    public static void main(String[] args) {

        run(new JTreeDemo(), 800, 600);

    }

}

class Dir{

    private String path;

    private String name;

    private String access;

    public Dir(String path, String name, String access) {

        super();

        this.path = path;

        this.name = name;

        this.access = access;

    }

    @Override

    public String toString() {

        return path;//GUI上树显示的节点信息

    }

}

package swing.tree;

import static common.SwingConsole.run;

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.awt.event.MouseMotionAdapter;

import javax.swing.BorderFactory;

import javax.swing.Icon;

import javax.swing.ImageIcon;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JTree;

import javax.swing.border.Border;

import javax.swing.tree.DefaultMutableTreeNode;

import javax.swing.tree.DefaultTreeModel;

import javax.swing.tree.TreePath;

import com.sun.security.auth.UserPrincipal;

/*2015-6-1*/

public class JTreeDemo extends JFrame {

    private static final long serialVersionUID = 1L;

    private JTree tree;

    private DefaultMutableTreeNode root;

    private DefaultTreeModel model;

    private JPanel content;

    private Border inBorder = BorderFactory.createLineBorder(Color.LIGHT_GRAY);

    public JTreeDemo() {

        initGUI();

        initListener();

    }

    private void initGUI() {

        content = new JPanel();

        content.setLayout(new BorderLayout());

        getContentPane().add(content);

        root = new DefaultMutableTreeNode();

        model = new DefaultTreeModel(root);

        for (int i = 1; i <= 3; i++) {

            DemoNode cate = new DemoNode(produceImage("arrow_left.png"), new UserPrincipal("我的好友" + i));

            for (int j = 1; j <= 3; j++) {

                DemoNode node = new DemoNode(produceImage("avatar.png"), new UserPrincipal("好友" + i + "-" + j), "人生若只如初见");

                cate.add(node);

            }

            root.add(cate);

        }

        tree = new JTree();

        tree.setModel(model);

        tree.setRootVisible(false);

        tree.setToggleClickCount(1);

        tree.setCellRenderer(new DemoRenderer());// 更改节点图标

        tree.putClientProperty("JTree.lineStyle", "None");// 去掉父子节点之间的线条

        content.add(tree, BorderLayout.CENTER);

    }

    private Icon produceImage(String name) {

        ImageIcon backImage = new ImageIcon(getClass().getClassLoader().getResource(name));

        return backImage;

    }

    private void initListener() {

        tree.addMouseListener(new MouseAdapter() {

            @Override

            public void mouseClicked(MouseEvent e) {

                TreePath path = tree.getSelectionPath();

                if (null != path) {

                    Object object = path.getLastPathComponent();

                    DemoNode node = (DemoNode) object;

                    // 二级节点（分组）咱就不管了

                    if (node.getLevel() == 2) {

                        node.nodeContent.setBorder(inBorder);

                        node.nodeContent.setBackground(Color.ORANGE);

                        // 去掉选中之外其他所有节点的特效

                        for (int i = 0; i < root.getChildCount(); i++) {

                            DemoNode cate = (DemoNode) root.getChildAt(i);

                            // 三级节点

                            for (int j = 0; j < cate.getChildCount(); j++) {

                                DemoNode buddy = (DemoNode) cate.getChildAt(j);

                                if (node != buddy) {

                                    buddy.nodeContent.setBorder(null);

                                    buddy.nodeContent.setBackground(null);

                                }

                                model.reload(buddy);

                            }

                        }

                        model.reload(node);

                    }

                }

            }

        });

        tree.addMouseMotionListener(new MouseMotionAdapter() {

            // 没有使用moseEnter事件，是因为此方法里面没有可以获取当前节点的API

            // 大家若是知道有更好的方法，可以告诉我一下，感激不尽

            // 还有，大家看到如下方法，循环太多，如果节点过多的话，效率就不行了，但是事件只能加到jtree上，如果能加到我重绘的UI上就好了。。。

            @Override

            public void mouseMoved(MouseEvent e) {

                TreePath path = tree.getPathForLocation(e.getX(), e.getY());

                if (null != path) {

                    Object object = path.getLastPathComponent();

                    DemoNode node = (DemoNode) object;

                    // 不管三七二十一，先把自己的特效加上再说

                    // 这里因为是鼠标移动事件，触发太快了，所以要判断是否在当前节点上移动鼠标

                    if (node.getLevel() == 1 && node.cateContent.getBorder() != inBorder) {

                        node.cateContent.setBorder(inBorder);

                    }

                    if (node.getLevel() == 2 && node.nodeContent.getBorder() != inBorder) {

                        node.nodeContent.setBorder(inBorder);

                    }

                    model.reload(node);

                    // 去掉选中之外其他所有节点的特效

                    for (int i = 0; i < root.getChildCount(); i++) {

                        DemoNode cate = (DemoNode) root.getChildAt(i);

                        if (node != cate && cate.cateContent.getBackground() != Color.ORANGE) {

                            cate.cateContent.setBorder(null);

                        }

                        model.reload(cate);

                        // 三级节点

                        for (int j = 0; j < cate.getChildCount(); j++) {

                            DemoNode buddy = (DemoNode) cate.getChildAt(j);

                            if (node != buddy && buddy.nodeContent.getBackground() != Color.ORANGE) {

                                buddy.nodeContent.setBorder(null);

                            }

                            model.reload(buddy);

                        }

                    }

                }

            }

        });

    }

    public static void main(String[] args) {

        run(new JTreeDemo(), 300, 600);

    }

}

class UserObject {

    private String path;

    private String name;

    private String access;

    public UserObject(String path, String name, String access) {

        super();

        this.path = path;

        this.name = name;

        this.access = access;

    }

    @Override

    public String toString() {

        return name;// GUI上树显示的节点信息

    }

}

package swing.tree;

import java.awt.Component;

import java.awt.Dimension;

import javax.swing.Icon;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.tree.DefaultMutableTreeNode;

/*2015-6-7*/

public class DemoNode extends DefaultMutableTreeNode{

    private static final long serialVersionUID = 1L;

    /** 图片 */

    private Icon icon;

    /** 节点信息 */

    private Object userObject;

    /** 签名 */

    private String sign;

    public JPanel cateContent;

    public JPanel nodeContent;

    public JLabel iconLabel;

    public JLabel nameLabel;

    public JLabel signLabel;

    /**

     * 初始化分组节点

     * @param name 名称

     */

    public DemoNode(Icon icon, Object name) {

        this.icon = icon;

        this.userObject = name;

        // 初始化UI

        initCateGUI();

    }

    /**

     * 初始化好友节点

     * @param icon 头像

     * @param nick 昵称

     * @param sign 签名

     */

    public DemoNode(Icon icon, Object nick, String sign) {

        this.icon = icon;

        this.userObject = nick;

        this.sign = sign;

        // 初始化UI

        initNodeGUI();

    }

    /**

     * 自定义分组UI

     */

    private void initCateGUI() {

        cateContent = new JPanel();

        cateContent.setLayout(null);

//        cateContent.setOpaque(false);

        // 这里大家注意，当我们写好UI之后可能会发现他的颜色不太对，

        // 这时候千万不要用上面那句，不然当我们想再次改变其颜色的时候，就生效不了

        // 红绿蓝分别为255的这个颜色趋近于透明，我们可以用它来代替setOpaque

//        cateContent.setBackground(new Color(255,255,255));

        // 突然发现置成null也可以

        cateContent.setBackground(null);

        cateContent.setPreferredSize(new Dimension(300, 25));

//        cateContent.setBorder(BorderFactory.createLineBorder(Color.LIGHT_GRAY));

        iconLabel = new JLabel(icon);

        iconLabel.setBounds(6, 5, 20, 16);

        cateContent.add(iconLabel);

        nameLabel = new JLabel(userObject.toString());

        nameLabel.setBounds(23, 0, 132, 28);

        cateContent.add(nameLabel);

    }

    /**

     * 自定义好友UI

     */

    private void initNodeGUI() {

        nodeContent = new JPanel();

        nodeContent.setLayout(null);

//        nodeContent.setOpaque(false);

        nodeContent.setBackground(null);

        nodeContent.setPreferredSize(new Dimension(300, 50));

//        nodeContent.setBorder(BorderFactory.createLineBorder(Color.LIGHT_GRAY));

        iconLabel = new JLabel(icon);

        iconLabel.setBounds(8, 4, 39, 42);

        nodeContent.add(iconLabel);

        nameLabel = new JLabel(userObject.toString());

        nameLabel.setBounds(59, 5, 132, 19);

        nodeContent.add(nameLabel);

        signLabel = new JLabel(sign);

        signLabel.setBounds(59, 28, 132, 17);

        nodeContent.add(signLabel);

    }

    /**

     * 将自定义UI返回给渲染器    <br/>

     * 供渲染器调用，返回的必须是一个Component

     * @return

     */

    public Component getCateView() {

        return cateContent;

    }

    /**

     * 将自定义UI返回给渲染器    <br/>

     * 供渲染器调用，返回的必须是一个Component

     * @return

     */

    public Component getNodeView() {

        return nodeContent;

    }

}

package swing.tree;

import java.awt.Component;

import javax.swing.ImageIcon;

import javax.swing.JTree;

import javax.swing.tree.DefaultTreeCellRenderer;

public class DemoRenderer extends DefaultTreeCellRenderer {

    private static final long serialVersionUID = 1L;

    @Override

    public Component getTreeCellRendererComponent(JTree tree, Object value,

            boolean sel, boolean expanded, boolean leaf, int row,

            boolean hasFocus) {

//        DefaultMutableTreeNode node = (DefaultMutableTreeNode) value;

//        // 根节点从0开始，依次往下

//        // 分组

//        if (node.getLevel() == 1) {

//            if (expanded) {

//                this.setIcon(new ImageIcon(getClass().getClassLoader().getResource("arrow_down.png")));

//            } else {

//                this.setIcon(new ImageIcon(getClass().getClassLoader().getResource("arrow_left.png")));

//            }

//        }

//        // 好友

//        if (node.getLevel() == 2) {

//            this.setIcon(new ImageIcon(getClass().getClassLoader().getResource("qq_icon.png")));

//        }

//        this.setText(value.toString());

//        return this;

        // 大家这里注意，我为了节省时间，所以就没有写两个node类

        // 所有的代码写在了同一个类中，然后根据不同的节点来调用相应的方法

        DemoNode node = (DemoNode) value;

        if (node.getLevel() == 1) {

            if (expanded) {

                node.iconLabel.setIcon(new ImageIcon(getClass().getClassLoader().getResource("arrow_down.png")));

            } else {

                node.iconLabel.setIcon(new ImageIcon(getClass().getClassLoader().getResource("arrow_left.png")));

            }

            return node.getCateView();

        }

        if (node.getLevel() == 2) {

            node.iconLabel.setIcon(new ImageIcon(getClass().getClassLoader().getResource("qq_icon.png")));

            return node.getNodeView();

        }

        return this;

    }

}

http://www.iteye.com/topic/1138211

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