在一个图片上画一个二维码

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.QRCodeWriter;

public class QRCodePainter {
    public static void main(String[] args) {
        String backgroundImageFile = "background.jpg";
        String qrCodeContent = "Hello, World!";

        try {
            // 加载背景图片
            BufferedImage image = ImageIO.read(new File(backgroundImageFile));

            // 创建二维码
            QRCodeWriter qrCodeWriter = new QRCodeWriter();
            BitMatrix bitMatrix = qrCodeWriter.encode(qrCodeContent, BarcodeFormat.QR_CODE, 200, 200);

            // 绘制二维码到图片中心
            int xPos = (image.getWidth() - bitMatrix.getWidth()) / 2;
            int yPos = (image.getHeight() - bitMatrix.getHeight()) / 2;
            for (int x = 0; x < bitMatrix.getWidth(); x++) {
                for (int y = 0; y < bitMatrix.getHeight(); y++) {
                    image.setRGB(xPos + x, yPos + y, bitMatrix.get(x, y) ? Color.BLACK.getRGB() : Color.WHITE.getRGB());
                }
            }

            // 保存带有二维码的新图片
            String outputFile = "output.jpg";
            ImageIO.write(image, "jpg", new File(outputFile));

            System.out.println("成功生成带有二维码的图片：" + outputFile);
        } catch (IOException | WriterException e) {
            e.printStackTrace();
        }
    }
}