springboot的功能逐渐强大，除了可以给图片加水印以外，还能给图片加上二维码，支持私人订制，哈哈哈哈，废话不多说，直接上代码

首先是引入依赖，gradle是引入下面这两个，maven引入自行搜索

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compile("com.google.zxing:core:3.4.0")
compile("com.google.zxing:javase:3.4.0")

然后进入正文

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@PostMapping("/watermarkImages")
public String watermarkImages() throws Exception {
    //获取原始图片文件
    String srcImgPath = "F://bg1.png";
    String fileNameType = srcImgPath.substring(srcImgPath.lastIndexOf("."), srcImgPath.length());
    String tarImgPath = CustomConfig.diskLocation + System.currentTimeMillis() + fileNameType; //待存储的地址
    addWaterMark(srcImgPath, tarImgPath);
    return "success";
}
 
/***
 * 在一张背景图上添加二维码
 * @param bigImgPath 背景图的路径
 * @param outPathWithFileName 输出路径
 */
public void addWaterMark(String bigImgPath, String outPathWithFileName) throws Exception {
    // 读取原图片信息
    File srcImgFile = new File(bigImgPath);//得到文件
    Image srcImg = ImageIO.read(srcImgFile);//文件转化为图片
    int srcImgWidth = srcImg.getWidth(null);//获取图片的宽
    int srcImgHeight = srcImg.getHeight(null);//获取图片的高
    // 加水印
    BufferedImage bufImg = new BufferedImage(srcImgWidth, srcImgHeight, BufferedImage.TYPE_INT_RGB);
    Graphics2D g = bufImg.createGraphics();
    g.drawImage(srcImg, 0, 0, srcImgWidth, srcImgHeight, null);
    String content = "时光蹉跎看淡岁月你我";
    //使用工具类生成二维码
    Image image = QRCodeUtil.createImages(content);
    //将小图片绘到大图片上,500,300 .表示你的小图片在大图片上的位置。
    g.drawImage(image, 500, 500, null);
    //设置颜色。
    g.setColor(Color.WHITE);
    g.dispose();
    // 输出图片
    FileOutputStream outImgStream = new FileOutputStream(outPathWithFileName);
    ImageIO.write(bufImg, "png", outImgStream);
    System.out.println("添加水印完成");
    outImgStream.flush();
    outImgStream.close();
}
 
 
/***
 * 生成二维码
 * @param content 二维码里面的内容
 */
public static BufferedImage createImages(String content) throws Exception {
    Hashtable hints = new Hashtable();
    hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
    hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
    hints.put(EncodeHintType.MARGIN, 1);
    BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, 192, 192, hints);
    int width = bitMatrix.getWidth();
    int height = bitMatrix.getHeight();
    BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    for (int x = 0; x < width; x++) {
        for (int y = 0; y < height; y++) {
            image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
        }
    }
    return image;
}