為了避免目錄列舉消耗時間過長,請指定一個目錄來模擬,命令行參數(shù):代表路徑的字符串.

如果認可代碼,請加分50,謝謝

----

import javax.swing.*;

import javax.swing.tree.*;

import java.awt.*;

import java.io.*;

final public class FileTree extends JFrame {

public FileTree(File dir) throws HeadlessException {

super("File Tree");

JTree tree;

add(new JScrollPane(tree =new JTree(buildTreeModel(dir))));

tree.setCellRenderer(new FileTreeRenderer());

setSize(400,600);

setVisible(true);

}

private TreeModel buildTreeModel(File dir){

DefaultMutableTreeNode root = new DefaultMutableTreeNode(dir);

walkthrough(dir,root);

return new DefaultTreeModel(root);

}

private static void walkthrough(File f,DefaultMutableTreeNode node){

for (File fle : f.listFiles()) {

DefaultMutableTreeNode n = new DefaultMutableTreeNode(fle);

node.add(n);

if (fle.isDirectory()){

walkthrough(fle, n);

}

}

}

private class FileTreeRenderer extends DefaultTreeCellRenderer {

public Component getTreeCellRendererComponent(JTree tree, Object value, boolean sel, boolean expanded, boolean leaf, int row, boolean hasFocus) {

JLabel cmp = (JLabel)super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf, row, hasFocus);

if (value instanceof DefaultMutableTreeNode) {

DefaultMutableTreeNode n = (DefaultMutableTreeNode)value;

Object obj = n.getUserObject();

if (obj instanceof File) {

File f = (File)obj;

cmp.setText(f.getName());

cmp.setForeground(f.isDirectory()?Color.BLUE:Color.BLACK);

}

}

return cmp;

}

}

public static void main(String[] args) {

new FileTree(new File(args[0]));

}

}

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