我可以将字节数组转换为位图，但同样的过程反过来会产生一个null

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;

public class ImageConverter {
    public static byte[] imageToByteArray(File imageFile) {
        try {
            BufferedImage bufferedImage = ImageIO.read(imageFile);
            if (bufferedImage == null) {
                throw new IOException("Failed to read image file.");
            }
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            ImageIO.write(bufferedImage, "png", baos);
            return baos.toByteArray();
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }

    public static void main(String[] args) {
        File imageFile = new File("path_to_your_image.png");
        byte[] imageBytes = imageToByteArray(imageFile);
        if (imageBytes != null) {
            System.out.println("Image successfully converted to byte array.");
        } else {
            System.out.println("Failed to convert image to byte array.");
        }
    }
}