java文本复制粘贴功能代码

以下是Java Swing中实现文本复制粘贴功能的示例代码：

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

public class TextCopyPasteExample extends JFrame {
    private JTextArea textArea;
    private JPopupMenu popupMenu;
    private JMenuItem copyItem;
    private JMenuItem pasteItem;

    public TextCopyPasteExample() {
        // 创建文本区域
        textArea = new JTextArea();
        JScrollPane scrollPane = new JScrollPane(textArea);
        getContentPane().add(scrollPane, BorderLayout.CENTER);

        // 创建弹出菜单
        popupMenu = new JPopupMenu();
        copyItem = new JMenuItem("复制");
        pasteItem = new JMenuItem("粘贴");
        popupMenu.add(copyItem);
        popupMenu.add(pasteItem);

        // 添加菜单项的事件监听器
        copyItem.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                copyText();
            }
        });
        pasteItem.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                pasteText();
            }
        });

        // 添加弹出菜单的触发器
        textArea.addMouseListener(new MouseAdapter() {
            public void mousePressed(MouseEvent e) {
                showPopupMenu(e);
            }
            public void mouseReleased(MouseEvent e) {
                showPopupMenu(e);
            }
        });

        // 设置窗口属性
        setTitle("文本复制粘贴示例");
        setSize(400, 300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        setVisible(true);
    }

    // 显示弹出菜单
    private void showPopupMenu(MouseEvent e) {
        if (e.isPopupTrigger()) {
            popupMenu.show(e.getComponent(), e.getX(), e.getY());
        }
    }

    // 复制文本到剪切板
    private void copyText() {
        StringSelection selection = new StringSelection(textArea.getSelectedText());
        Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
        clipboard.setContents(selection, null);
    }

    // 从剪切板粘贴文本
    private void pasteText() {
        Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
        Transferable contents = clipboard.getContents(null);
        if (contents != null && contents.isDataFlavorSupported(DataFlavor.stringFlavor)) {
            try {
                String text = (String) contents.getTransferData(DataFlavor.stringFlavor);
                textArea.replaceSelection(text);
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        }
    }

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

该示例中创建了一个JFrame窗口，并在其中添加了一个JTextArea文本区域，通过添加鼠标事件监听器，在鼠标右键点击时弹出复制粘贴的弹出菜单。在复制和粘贴的方法中，通过Java提供的Clipboard类和Transferable接口实现将文本复制到剪切板和从剪切板中粘贴文本的功能。