java写GUI界面实现文件拷贝

好的，您可以使用Java自带的Swing框架来实现一个简单的GUI界面，然后使用Java IO库来完成文件拷贝的功能。

以下是一个简单的实现示例：

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import javax.swing.*;

public class CopyFileGUI {
    private JFrame frame;
    private JButton srcButton;
    private JButton destButton;
    private JButton copyButton;
    private JLabel statusLabel;
    private String srcPath;
    private String destPath;

    public CopyFileGUI() {
        // 创建GUI界面
        frame = new JFrame("文件拷贝");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(400, 150);
        frame.setLayout(new GridLayout(4, 1));

        // 创建选择源文件按钮
        srcButton = new JButton("选择源文件");
        srcButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                JFileChooser chooser = new JFileChooser();
                int returnVal = chooser.showOpenDialog(frame);
                if (returnVal == JFileChooser.APPROVE_OPTION) {
                    srcPath = chooser.getSelectedFile().getAbsolutePath();
                    System.out.println(srcPath);
                }
            }
        });
        frame.add(srcButton);

        // 创建选择目标文件夹按钮
        destButton = new JButton("选择目标文件夹");
        destButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                JFileChooser chooser = new JFileChooser();
                chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
                int returnVal = chooser.showOpenDialog(frame);
                if (returnVal == JFileChooser.APPROVE_OPTION) {
                    destPath = chooser.getSelectedFile().getAbsolutePath();
                    System.out.println(destPath);
                }
            }
        });
        frame.add(destButton);

        // 创建拷贝按钮
        copyButton = new JButton("开始拷贝");
        copyButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                if (srcPath == null || srcPath.isEmpty()) {
                    statusLabel.setText("请选择源文件！");
                    return;
                }

                if (destPath == null || destPath.isEmpty()) {
                    statusLabel.setText("请选择目标文件夹！");
                    return;
                }

                try {
                    // 拷贝文件
                    FileInputStream inputStream = new FileInputStream(srcPath);
                    FileOutputStream outputStream = new FileOutputStream(destPath + File.separator + new File(srcPath).getName());
                    byte[] buffer = new byte[1024];
                    int length;
                    while ((length = inputStream.read(buffer)) > 0) {
                        outputStream.write(buffer, 0, length);
                    }
                    inputStream.close();
                    outputStream.close();
                    statusLabel.setText("文件拷贝成功！");
                } catch (IOException ex) {
                    statusLabel.setText("文件拷贝失败：" + ex.getMessage());
                }
            }
        });
        frame.add(copyButton);

        // 创建状态标签
        statusLabel = new JLabel("", JLabel.CENTER);
        frame.add(statusLabel);

        // 显示GUI界面
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        new CopyFileGUI();
    }
}

运行以上代码，即可看到一个简单的文件拷贝GUI界面。