如何将标准复制操作映射到Swing中的弹出菜单

import javax.swing.*;
import java.awt.*;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.StringSelection;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

public class CopyPopupMenuExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame("Copy Popup Menu Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(300, 200);

        JTextArea textArea = new JTextArea();
        textArea.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseReleased(MouseEvent e) {
                if (e.isPopupTrigger()) {
                    JPopupMenu popupMenu = new JPopupMenu();
                    JMenuItem copyMenuItem = new JMenuItem("复制");
                    copyMenuItem.addActionListener(new ActionListener() {
                        @Override
                        public void actionPerformed(ActionEvent e) {
                            String selectedText = textArea.getSelectedText();
                            if (selectedText != null) {
                                Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
                                clipboard.setContents(new StringSelection(selectedText), null);
                            }
                        }
                    });
                    popupMenu.add(copyMenuItem);
                    popupMenu.show(e.getComponent(), e.getX(), e.getY());
                }
            }
        });

        frame.add(textArea);
        frame.setVisible(true);
    }
}