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你想你的Swing程序拥有像资源管理器一样的树吗？还要Lazy loading的吗？

那就看看我下面实现的文件树代码

public class ExplorerTree extends JPanel { private JTree tree; private TreePath treePath; public ExplorerTree() { this.setLayout(new BorderLayout()); DefaultMutableTreeNode root = new DefaultMutableTreeNode("Explorer"); tree = new JTree(root); File[] roots = File.listRoots(); for (int i = 0; i < roots.length; i++) { DefaultMutableTreeNode node = new DefaultMutableTreeNode(roots[i].getPath()); root.add(node); } MouseListener ml = new MouseAdapter() { public void mousePressed(MouseEvent e) { try { TreePath tp = tree.getPathForLocation(e.getX(), e.getY()); if (tp != null) { treePath = tp; int size = treePath.getPath().length; StringBuffer pathname = new StringBuffer(); if (size > 0) { for (int i = 1; i < size; i++) { if (i > 2) { pathname.append("//"); } pathname.append(treePath.getPath()[i].toString()); } System.out.println(pathname.toString()); File file = new File(pathname.toString()); File[] list = file.listFiles(); for (int i = 0; i < list.length; i++) { String[] strings = list[i].getPath().split(""); DefaultMutableTreeNode node = new DefaultMutableTreeNode(strings[strings.length - 1]); ((DefaultMutableTreeNode) tp.getLastPathComponent()).add(node); } } } } catch (Exception e1) { System.out.println("can not open"); } } }; tree.addMouseListener(ml); tree.setShowsRootHandles(true); tree.setRootVisible(true); JScrollPane scrPane = new JScrollPane(tree); add(scrPane); } public static void main(String[] args) { JFrame jFrame = new JFrame("Explorer"); jFrame.setLayout(new BorderLayout()); jFrame.add(new ExplorerTree()); jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); jFrame.setSize(300, 700); jFrame.setVisible(true); }}

最近比较忙，没时间写blog，就拿些代码来献献丑了

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