列出文件

package iotest;

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;

public class ListFileDemo
{
    public static void main(String[] args)
    {
        ListFileDemoFrame frame = new ListFileDemoFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.show();
    }
}
class ListFileDemoFrame extends JFrame
{
    private JTextArea area;
    public ListFileDemoFrame()
    {
        setTitle("ListFileDemoFrame");
        setSize(400,380);
       
        Container con = getContentPane();
        ListFileDemoPanel panel = new ListFileDemoPanel(ListFileDemoFrame.this);
        con.add(panel,"North");
        area = new JTextArea();
        JScrollPane sp = new JScrollPane(area);
        con.add(sp);
    }
    public JTextArea getArea()
    {
        return area;
    }
}
class ListFileDemoPanel extends JPanel
{
    private File f;
    private ListFileDemoFrame frame;
    public ListFileDemoPanel(ListFileDemoFrame fr)
    {
        frame = fr;
        JButton browse = new JButton("浏览");
        browse.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                JFileChooser chooser = new JFileChooser();
                chooser.setCurrentDirectory(new File("D:\\"));
                chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
                int result = chooser.showOpenDialog(null);
                if(result == JFileChooser.APPROVE_OPTION)
                {
                    f = chooser.getSelectedFile();
                }
            }
        });
        JButton print = new JButton("打印");
        print.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                loopSearch(f);
            }
        });
        JButton save = new JButton("保存");
        save.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                JFileChooser chooser = new JFileChooser();
                chooser.setCurrentDirectory(new File("D:\\"));
                chooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
                chooser.setFileFilter(new javax.swing.filechooser.FileFilter()
                {
                    public boolean accept(File f)
                    {
                        return f.getName().toLowerCase().endsWith(".txt") || f.isDirectory();
                    }
                    public String getDescription()
                    {
                        return "文本文件";
                    }
                });
                int result = chooser.showSaveDialog(null);
                if(result == JFileChooser.APPROVE_OPTION)
                {
                    try
                    {
                        File savefile = chooser.getSelectedFile();
                        RandomAccessFile raf = new RandomAccessFile(savefile.getPath(),"rw");
                        raf.write(frame.getArea().getText().getBytes());
                    }
                    catch(IOException ee)
                    {
                       
                    }
                }
            }
        });
        add(browse);
        add(print);
        add(save);
    }
    public void loopSearch(File file)  //核心递归算法
    {
        File[] ff = file.listFiles();
        for(int i = 0;i < ff.length;i++)
        {
            if(ff[i].isDirectory())
            {
                loopSearch(ff[i]);
            }
            else
            {
                frame.getArea().append(ff[i].getPath()+"\r\n");
                System.out.println(ff[i].getPath());
            }
        }
    }
}