如何使用 DefaultMutableTreeNode、JTree 获得文件夹结构

Question

我试图显示 folder/subfolder 与 parent/children

相同的文件夹结构

假设这个结构：

但是我正在为如何将子节点添加到父节点而苦苦挣扎，我有一个名为 Computerscience 的父文件夹，我获取了它的所有子文件夹并将它们添加为子文件夹，但是当有它们里面有更多的子文件夹，看来我需要一个递归函数，但我做不到，这是我所做的：

import java.awt.BorderLayout;
import java.io.File;
import java.util.Arrays;
import javax.swing.JFrame;
import static javax.swing.JFrame.EXIT_ON_CLOSE;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;

public class TestTree extends JFrame {

    JTree tree;
    DefaultTreeModel treeModel;

    public TestTree() {
        super("Tree Test Example");
        setSize(400, 300);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
    }

    protected String[] getListFiles(String Path) {
        File file = new File(Path);
        String[] names = file.list();
        return names;
    }

    public void init() {
        DefaultMutableTreeNode root = new DefaultMutableTreeNode("Computerscience");
        String[] names = this.getListFiles("C:\Users\neginn\Google Drive\NetBeansProjects\computerscience");
        for (String name : names) {
            root.add(new DefaultMutableTreeNode(name));
            String[] names_level_2 = this.getListFiles("C:\Users\neginn\Google Drive\NetBeansProjects\computerscience\" + name);
            if (names_level_2 != null) {
                for (String name_level2 : names_level_2) {
                    int folder_index = Arrays.asList(names_level_2).indexOf(name_level2);
                    treeModel.insertNodeInto(root, (DefaultMutableTreeNode) root.getChildAt(folder_index), folder_index);
                }
            }
        }
        treeModel = new DefaultTreeModel(root);
        tree = new JTree(treeModel);

        getContentPane().add(tree, BorderLayout.CENTER);
    }

    public static void main(String args[]) {
        TestTree tt = new TestTree();
        tt.init();
        tt.setVisible(true);
    }
}

我的问题在行 treeModel.insertNodeInto

Answer 1

正如你所说，你需要写一个递归方法。我试着写了一个，请测试下面的代码：

public class TestTree extends JFrame {

    JTree tree;
    DefaultTreeModel treeModel;

    public TestTree() {
        super("Tree Test Example");
        setSize(400, 300);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
    }

    protected File[] getListFiles(String Path) {
        File file = new File(Path);
        return file.listFiles();
    }

    private void addChilds(DefaultMutableTreeNode rootNode, String path) {
        File[] files = this.getListFiles(path);
        for(File file:files) {
            if(file.isDirectory()) {
                DefaultMutableTreeNode subDirectory = new DefaultMutableTreeNode(file.getName());
                addChilds(subDirectory, file.getAbsolutePath());
                rootNode.add(subDirectory);
            } else {
                rootNode.add(new DefaultMutableTreeNode(file.getName()));
            }
        }
    }

    public void init() {
        DefaultMutableTreeNode root = new DefaultMutableTreeNode("Computerscience");

        addChilds(root, "C:\Users\neginn\Google Drive\NetBeansProjects\computerscience");

        treeModel = new DefaultTreeModel(root);
        tree = new JTree(treeModel);

        getContentPane().add(tree, BorderLayout.CENTER);
    }

    public static void main(String args[]) {
        TestTree tt = new TestTree();
        tt.init();
        tt.setVisible(true);
    }
}

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