Graphics2D 图片上添加图片或绘制二维码

代码实例

        // 读取原图片信息
        //得到文件
        File file = new File("d:\\1.png");
        //文件转化为图片
        Image srcImg = ImageIO.read(file);
        //获取图片的宽
        int srcImgWidth = srcImg.getWidth(null);
        //获取图片的高
        int srcImgHeight = srcImg.getHeight(null);
        // 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);
 
        //使用工具类生成二维码
        Image image = createQrCode("二维码内容", 226, 226, "二维码中间logo图片地址");
        //将小图片绘到大图片上,表示你的小图片在大图片上的位置。
        g.drawImage(image, 263, 700, null);
 
        //或者将图片绘制上去
        File file = new File("d:\\2.png");
        BufferedImage read = ImageIO.read(file);
        Graphics2D k = bufImg.createGraphics();
        //将小图片绘到大图片上,表示你的小图片在大图片上的位置。
        k.drawImage(read, 650, 188, 150,150,null);
        k.setColor(Color.WHITE);
        k.dispose();
 
 
        //设置颜色。
        g.setColor(Color.WHITE);
        g.dispose();
 
 
        ByteArrayOutputStream bs = new ByteArrayOutputStream();
        ImageOutputStream imOut = ImageIO.createImageOutputStream(bs);
        ImageIO.write(bufImg, "png", imOut);
        InputStream inputStream = new ByteArrayInputStream(bs.toByteArray());
        OutputStream outStream = new FileOutputStream("d:\\3.png");
        IOUtils.copy(inputStream, outStream);
        inputStream.close();
        outStream.close();

    private static BufferedImage createQrCode(String content, int width, int height, String logoPath) throws IOException {
        QrConfig config = new QrConfig(width, height);
        if (logoPath != null) {
            Image image = ImageIO.read(new FileInputStream(new File(logoPath)));
            config.setImg(image);
        }
        config.setErrorCorrection(ErrorCorrectionLevel.H);
        return QrCodeUtil.generate(
                content,
                config);
    }

二维码生成工具引用

        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.2.4</version>
        </dependency>