二维码的生成&加背景图片的嵌套->支付宝(Java)

导入google.zxing包
在pom. 中添加

    <dependency>
        <groupId>com.google.zxing</groupId>
        <artifactId>core</artifactId>
        <version>3.1.0</version>
 </dependency>
 
<dependency>
       <groupId>com.twelvemonkeys.imageio</groupId>
       <artifactId>imageio-jpeg</artifactId>
       <version>3.0-rc5</version>
</dependency>

实现编码

public class ZXingCode {
 
    private static final int QRCOLOR = 0xFF000000; // 默认是黑色
    private static final int BGWHITE = 0xFFFFFFFF; // 背景颜色
 
    private static final int WIDTH = 200; // 二维码宽
    private static final int HEIGHT = 200; // 二维码高
 
    // 用于设置QR二维码参数
    private static Map<EncodeHintType,  > hints = new HashMap<EncodeHintType,  >() {
        private static final long serialVersionUID = 1L;
 
        {
            put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);// 设置QR二维码的纠错级别（H为最高级别）具体级别信息
            put(EncodeHintType.CHARACTER_SET, \"utf-8\");// 设置编码方式
            put(EncodeHintType.MARGIN, 0);
        }
    };
 
 
    // 生成带logo的二维码图片
    public static void drawLogoQRCode(File logoFile, File codeFile, String qrUrl) {
        try {
            MultiFormatWriter multiFormatWriter = new MultiFormatWriter();
            // 参数顺序分别为：编码内容，编码类型，生成图片宽度，生成图片高度，设置参数
            BitMatrix bm = multiFormatWriter.encode(qrUrl, BarcodeFormat.QR_CODE, WIDTH, HEIGHT, hints);
            BufferedImage image = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
 
            // 开始利用二维码数据创建Bitmap图片，分别设为黑（0xFFFFFFFF）白（0xFF000000）两色
            for (int x = 0; x < WIDTH; x++) {
                for (int y = 0; y < HEIGHT; y++) {
                    image.setRGB(x, y, bm.get(x, y) ? QRCOLOR : BGWHITE);
                }
            }
 
            int width = image.getWidth();
            int height = image.getHeight();
            if ( s.nonNull(logoFile) && logoFile.exists()) {
                // 构建绘图对象
                Graphics2D g = image.createGraphics();
                // 读取Logo图片
                BufferedImage logo = ImageIO.read(logoFile);
                // 开始绘制logo图片
                g.drawImage(logo, width * 2 / 5, height * 2 / 5, width * 2 / 10, height * 2 / 10, null);
                g.dispose();
                logo.flush();
            }
 
            image.flush();
 
            ImageIO.write(image, \"png\", codeFile); // TODO
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 
    public static void main(String[] args) throws WriterException {
        File logoFile = new File(\"C://Users//mayn//Desktop//型号//小米//hongmi 5A//5a9d2490N317048d9.jpg\");
        File QrCodeFile = new File(\"C://Users//mayn//Desktop//05.png\");
        String url = \"https://www.baidu.com/\";
        String note = \"访问百度连接\";
        drawLogoQRCode(logoFile, QrCodeFile, url);
       
}

3.合成二维码

public class mergeImage {
 
 
    public static void mergeImage(String bigPath, String smallPath, String x, String y) throws IOException {
 
        try {
            BufferedImage small;
            BufferedImage big = ImageIO.read(new File(bigPath));
            if (smallPath.contains(\"http\")) {
 
                URL url = new URL(smallPath);
                small = ImageIO.read(url);
            } else {
                small = ImageIO.read(new File(smallPath));
            }
 
            Graphics2D g = big.createGraphics();
 
            float fx = Float.parseFloat(x);
            float fy = Float.parseFloat(y);
            int x_i = (int) fx;
            int y_i = (int) fy;
            g.drawImage(small, x_i, y_i, small.getWidth(), small.getHeight(), null);
            g.dispose();
            ImageIO.write(big, \"png\", new File(bigPath));
 
        } catch (Exception e) {
            e.printStackTrace();
        }
 
    }
}

4.执行

public static void main(String[] args) throws WriterException {
        try {
            mergeImage.mergeImage(\"C://Users//mayn//Desktop//origin.png\", \"C://Users//mayn//Desktop//05.png\", \"63\", \"163\");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

代码转载:https://blog.csdn.net/FTL_NXY/article/details/81483343
做一备忘