如何在Vaadin中复制文本到剪贴板而不添加插件

import com.vaadin.flow.component.button.Button;
import com.vaadin.flow.component.button.ButtonVariant;
import com.vaadin.flow.component.notification.Notification;
import com.vaadin.flow.component.orderedlayout.VerticalLayout;
import com.vaadin.flow.router.Route;
import com.vaadin.flow.server.StreamResource;

import java.io.ByteArrayInputStream;
import java.nio.charset.StandardCharsets;

@Route("")
public class ClipboardExampleView extends VerticalLayout {

    public ClipboardExampleView() {
        // 创建一个按钮
        Button copyButton = new Button("复制文本");
        copyButton.addThemeVariants(ButtonVariant.LUMO_PRIMARY);

        // 设置按钮的点击事件处理程序
        copyButton.addClickListener(event -> {
            // 调用Clipboard API复制文本到剪贴板
            copyToClipboard("要复制的文本");
            Notification.show("文本已复制到剪贴板");
        });

        // 将按钮添加到布局中
        add(copyButton);
    }

    private void copyToClipboard(String text) {
        // 创建一个StreamResource，用于将文本复制到剪贴板
        StreamResource resource = new StreamResource("text.txt", () ->
                new ByteArrayInputStream(text.getBytes(StandardCharsets.UTF_8)));

        // 获取剪贴板对象
        Clipboard clipboard = Clipboard.get();

        // 将文本复制到剪贴板
        clipboard.write(resource);
    }
}