在没有ImageIO.read()的情况下从JPG到PNG图像的转换

import org.apache.commons.imaging.ImageReadException;
import org.apache.commons.imaging.ImageWriteException;
import org.apache.commons.imaging.Imaging;
import org.apache.commons.imaging.common.bytesource.ByteSourceFile;
import org.apache.commons.imaging.formats.jpeg.JpegImageParser;
import org.apache.commons.imaging.formats.png.PngImageParser;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;

public class JpgToPngConverter {
    public static void main(String[] args) {
        File jpgFile = new File("path/to/input.jpg");
        File pngFile = new File("path/to/output.png");

        try {
            byte[] jpgBytes = readBytes(jpgFile);
            convertToPng(jpgBytes, pngFile);
            System.out.println("JPG to PNG conversion successful.");
        } catch (IOException | ImageReadException | ImageWriteException e) {
            e.printStackTrace();
        }
    }

    private static byte[] readBytes(File file) throws IOException {
        try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
            Imaging.writeImageToBytes(new ByteSourceFile(file), outputStream, new JpegImageParser());
            return outputStream.toByteArray();
        }
    }

    private static void convertToPng(byte[] jpgBytes, File pngFile) throws IOException, ImageReadException, ImageWriteException {
        Imaging.writeImage(Imaging.getBufferedImage(jpgBytes), pngFile, new PngImageParser(), null);
    }
}