如何将图像从BufferStrategy绘制为Png文件？

import java.awt.*;
import java.awt.image.BufferStrategy;
import java.awt.image.BufferedImage;
import java.io.File;
import javax.imageio.ImageIO;

public class ImageExporter {
    public static void main(String[] args) {
        // 创建BufferStrategy对象
        BufferStrategy bufferStrategy = createBufferStrategy();

        // 创建BufferedImage对象
        BufferedImage image = createBufferedImage(bufferStrategy);

        // 绘制图像到BufferedImage
        drawImage(bufferStrategy, image);

        // 保存为Png文件
        saveAsPng(image, "path/to/save/image.png");
    }

    private static BufferStrategy createBufferStrategy() {
        // 创建窗口和Canvas
        Frame frame = new Frame();
        Canvas canvas = new Canvas();

        // 设置窗口可见
        frame.add(canvas);
        frame.pack();
        frame.setVisible(true);

        // 创建BufferStrategy
        canvas.createBufferStrategy(2);
        return canvas.getBufferStrategy();
    }

    private static BufferedImage createBufferedImage(BufferStrategy bufferStrategy) {
        // 获取BufferStrategy的宽度和高度
        int width = bufferStrategy.getDrawGraphics().getClipBounds().width;
        int height = bufferStrategy.getDrawGraphics().getClipBounds().height;

        // 创建BufferedImage
        return new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
    }

    private static void drawImage(BufferStrategy bufferStrategy, BufferedImage image) {
        // 获取Graphics2D对象
        Graphics2D g2d = (Graphics2D) image.getGraphics();

        // 绘制图像到BufferedImage
        bufferStrategy.getDrawGraphics().drawImage(image, 0, 0, null);

        // 释放资源
        g2d.dispose();
        bufferStrategy.show();
    }

    private static void saveAsPng(BufferedImage image, String filePath) {
        try {
            // 创建File对象
            File file = new File(filePath);

            // 保存为Png文件
            ImageIO.write(image, "png", file);

            System.out.println("Image saved successfully.");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}