java怎样把一个现有文件夹的结构创建成一个JTree

Question

比如java源文件的目录下面有一个文件夹AA，下面有两个文件夹BB和CC，BB中有文件DD.png和EE.png，CC下面有文件FF.png和GG.png，我需要创建一个splitpane，左边是一个树，树的结构就是文件夹AA的结构，右边面板在我点选树中的图片文件时显示图片。

Answer 1

package tmp;

import java.awt.BorderLayout;

import java.awt.EventQueue;

import java.awt.Graphics;

import java.awt.Image;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.border.EmptyBorder;

import javax.swing.tree.DefaultMutableTreeNode;

import javax.swing.tree.TreeNode;

import javax.swing.Icon;

import javax.swing.JSplitPane;

import javax.swing.JTree;

import javax.swing.JLabel;

import javax.swing.SwingUtilities;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.io.File;

import java.util.Arrays;

public class TestJTree extends JFrame {

private JPanel contentPane;

private Picture pic=null;

private String rootPath=TestJTree.class.getResource("/").getPath();

private JTree tree;

/**

* Launch the application.

*/

public static void main(String[] args) {

EventQueue.invokeLater(new Runnable() {

public void run() {

try {

TestJTree frame = new TestJTree();

frame.setVisible(true);

} catch (Exception e) {

e.printStackTrace();

}

}

});

}

/**

* Create the frame.

*/

public TestJTree() {

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setBounds(100, 100, 450, 300);

contentPane = new JPanel();

contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));

contentPane.setLayout(new BorderLayout(0, 0));

setContentPane(contentPane);

JSplitPane splitPane = new JSplitPane();

splitPane.setDividerLocation(120);

contentPane.add(splitPane, BorderLayout.CENTER);

MyTreeNode AA = new MyTreeNode(new File(rootPath+"AA"));

tree = new JTree(AA);

tree.addMouseListener(new MouseAdapter() {

@Override

public void mouseClicked(MouseEvent e) {

if (SwingUtilities.isLeftMouseButton(e)&& e.getClickCount() == 1) {

MyTreeNode node = (MyTreeNode) tree.getLastSelectedPathComponent();

FileNode fn=(FileNode) node.getUserObject();

File f=fn.getFile();

if(!f.isDirectory()){

pic.loadPic(f.getAbsolutePath());

}

}

}

});

splitPane.setLeftComponent(tree);

pic=new Picture();

splitPane.setRightComponent(pic);

}

}

class MyTreeNode extends DefaultMutableTreeNode{

MyTreeNode(File file){

super(new FileNode(file));

FileNode fn=(FileNode)this.userObject;

File f=fn.getFile();

if(f.isDirectory()){

File[] fs=f.listFiles();

for(File ff:fs){

this.add(new MyTreeNode(ff));

}

}

}

}

class FileNode{

private String name;

private File file;

public FileNode(File file){

this.file=file;

name=file.getName();

}

public String toString(){

return name;

}

public String getName() {

return name;

}

public File getFile() {

return file;

}

}

class Picture extends JPanel {

private String picName;

public Picture(String picName){

this.picName=picName;

}

public Picture() {

}

public void paint (Graphics g) {

g.clearRect(0, 0, this.getWidth(), this.getWidth());

if(this.picName!=null){

Image image = this.getToolkit().getImage(picName); 

       g.drawImage(image, 0, 0, this); 

}

}

public void loadPic(String picName){

this.picName=picName;

repaint();

}

}

//界面编程经验不多,代码可能有诸多不当之处,见谅

追问

真是万分感谢您的帮助啊 只是为什么在我的电脑上运行不正常呢 界面是这样的

追答

java源文件的目录下面有一个文件夹AA，下面有两个文件夹BB和CC，BB中有文件DD.png和EE.png，CC下面有文件FF.png和GG.png

你有这样放图片吗?

追问

能不能再麻烦您一下 就是再加个vertical的splitpane 下面弄个label 点选图片时 label显示一句简单的对所选图片的描述

追答

这个 你找到代码中点击选择图片的代码进行添加就可以了

Answer 2

一、jtree用法如下：

import javax.swing.JFrame;

import javax.swing.JTree;

import javax.swing.event.TreeSelectionEvent;

import javax.swing.event.TreeSelectionListener;

import javax.swing.tree.DefaultMutableTreeNode;

 

public class TreeDemo {

    public static void main(String[] args) {

 

        // 创建没有父节点和子节点、但允许有子节点的树节点，并使用指定的用户对象对它进行初始化。

        // public DefaultMutableTreeNode(Object userObject)

        DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("软件部");

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

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

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

 

        DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("销售部");

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

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

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

 

        DefaultMutableTreeNode top = new DefaultMutableTreeNode("职员管理");

 

        top.add(new DefaultMutableTreeNode(new User("总经理")));

        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.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("你选择了：" + user.toString());

                }

 

            }

        });

    }

}

 

class User {

    private String name;

 

    public User(String n) {

        name = n;

    }

 

    // 重点在toString，节点的显示文本就是toString

    public String toString() {

        return name;

    }

}

二、运行效果如下：

Answer 3

http://www.java2s.com/Code/Java/File-Input-Output/DisplayafilesysteminaJTreeview.htm
http://www.java2s.com/Tutorial/Java/0240__Swing/JTreeDisplayingtheFileSystemHierarchyUsingtheCustomTreeModel.htm追问

您给的这个网站打不开呀 能麻烦您发一份代码给我么