Генерация QR-кодов на Java

import com.google.zxing.*;
import com.google.zxing.client.j2se.MatrixToImageWriter;
import com.google.zxing.common.BitMatrix;
import java.nio.file.Path;

public class QRGenerator {
    public static void main(String[] args) throws Exception {
        BitMatrix matrix = new MultiFormatWriter().encode(
            "https://qrcode.fun",
            BarcodeFormat.QR_CODE, 300, 300
        );
        MatrixToImageWriter.writeToPath(matrix, "PNG", Path.of("qrcode.png"));
    }
}

import com.google.zxing.*;
import com.google.zxing.common.BitMatrix;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import java.io.File;

public class CustomQR {
    public static void main(String[] args) throws Exception {
        BitMatrix matrix = new MultiFormatWriter().encode(
            "https://qrcode.fun",
            BarcodeFormat.QR_CODE, 300, 300
        );

        BufferedImage image = new BufferedImage(300, 300, BufferedImage.TYPE_INT_RGB);
        int darkColor = 0xFF1A2B3C;
        int lightColor = 0xFFFFFFFF;

        for (int x = 0; x < 300; x++) {
            for (int y = 0; y < 300; y++) {
                image.setRGB(x, y, matrix.get(x, y) ? darkColor : lightColor);
            }
        }
        ImageIO.write(image, "PNG", new File("qrcode_custom.png"));
    }
}