Java File Copy Application: Simple File Copying using Byte Streams

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

public class FileCopyApplication extends JFrame implements ActionListener { private JTextArea sourceTextArea; private JTextArea destinationTextArea; private JButton copyButton;

public FileCopyApplication() {
    setTitle('File Copy Application');
    setSize(400, 300);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    // 创建源文件文本区域
    sourceTextArea = new JTextArea();
    JScrollPane sourceScrollPane = new JScrollPane(sourceTextArea);
    sourceScrollPane.setBorder(BorderFactory.createTitledBorder('Source File'));

    // 创建目标文件文本区域
    destinationTextArea = new JTextArea();
    JScrollPane destinationScrollPane = new JScrollPane(destinationTextArea);
    destinationScrollPane.setBorder(BorderFactory.createTitledBorder('Destination File'));

    // 创建复制按钮
    copyButton = new JButton('Copy');
    copyButton.addActionListener(this);

    // 创建容器并设置布局管理器
    Container container = getContentPane();
    container.setLayout(new BorderLayout());
    container.add(sourceScrollPane, BorderLayout.CENTER);
    container.add(destinationScrollPane, BorderLayout.EAST);
    container.add(copyButton, BorderLayout.SOUTH);
}

public void actionPerformed(ActionEvent event) {
    if (event.getSource() == copyButton) {
        String sourceText = sourceTextArea.getText();
        String destinationText = destinationTextArea.getText();

        try (InputStream inputStream = new FileInputStream(sourceText);
             OutputStream outputStream = new FileOutputStream(destinationText)) {
            byte[] buffer = new byte[1024];
            int bytesRead;
            while ((bytesRead = inputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, bytesRead);
            }
            JOptionPane.showMessageDialog(this, 'File copied successfully.');
        } catch (IOException e) {
            JOptionPane.showMessageDialog(this, 'An error occurred while copying the file.');
        }
    }
}

public static void main(String[] args) {
    SwingUtilities.invokeLater(new Runnable() {
        public void run() {
            FileCopyApplication application = new FileCopyApplication();
            application.setVisible(true);
        }
    });
}

}