java 生成图片二维码，并打印到图片上

灰太狼 2022-02-15 03:39 524阅读 0赞

zxing是生成1D和2D条形或二维码的工具类库，java图形库Graphics2D进行图片的合成。

依赖：

<dependency>
        <groupId>com.google.zxing</groupId>
        <artifactId>core</artifactId>
        <version>3.3.3</version>
    </dependency>

代码：  
以下为合成图片和二维码，合成2张图片参看第一个方法注释掉的代码

/*
     * overlapImage
     * @description：合成二维码和图片为文件
     * @author 李阳
     * @date 2018/12/13
     * @params [backPicPath, code]
     * @return void
     */
    public static final void combineCodeAndPicToFile(String backPicPath, BufferedImage code/*String fillPicPath*/) {
        try {
            BufferedImage big = ImageIO.read(new File(backPicPath));
            BufferedImage small = code;
            /*//合成两个文件时使用
            BufferedImage small = ImageIO.read(new File(fillPicPath));*/
            Graphics2D g = big.createGraphics();
    
            //二维码或小图在大图的左上角坐标
            int x = (big.getWidth() - small.getWidth()) / 2;
            // int y = (big.getHeight() - small.getHeight()) / 2;
            int y = (big.getHeight() - small.getHeight() - 100);
            g.drawImage(small, x, y, small.getWidth(), small.getHeight(), null);
            g.dispose();
            //为了保证大图背景不变色，formatName必须为"png"
            ImageIO.write(big, "png", new File("C:/Users/kevin/Desktop/combinePic.jpg"));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    /* 
     * combineCodeAndPicToInputstream
     * @description：合成二维码和图片为输出流，可用于下载或直接展示
     * @author 李阳
     * @date 2018/12/13
     * @params [backPicPath, code]
     * @return java.io.InputStream
     */
    public static final void combineCodeAndPicToInputstream(String backPicPath, BufferedImage code, HttpServletResponse resp) {
        try {
            BufferedImage big = ImageIO.read(new File(backPicPath));
            // BufferedImage small = ImageIO.read(new File(fillPicPath));
            BufferedImage small = code;
            Graphics2D g = big.createGraphics();
    
            //二维码或小图在大图的左上角坐标
            int x = (big.getWidth() - small.getWidth()) / 2;
            int y = (big.getHeight() - small.getHeight() - 100);   //二维码距大图下边距100
            g.drawImage(small, x, y, small.getWidth(), small.getHeight(), null);
            g.dispose();

resp.addHeader("Content-Disposition", "attachment;filename="+ URLEncoder.encode("lia阿里.png","UTF-8") );//去掉这行设置header的代码，前端访问可以直接展示
            //为了保证大图背景不变色，formatName必须为"png"
            ImageIO.write(big, "png", resp.getOutputStream());
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

/* 
     * combineCodeAndPicToBase64 
     * @description：合成二维码和图片为Base64，同样可用于直接展示
     * @author 李阳
     * @date 2018/12/14
     * @params [backPicPath, code]
     * @return java.lang.String
     */
    public static final String combineCodeAndPicToBase64(String backPicPath, BufferedImage code) {
        ImageOutputStream imOut = null;
        try {
            BufferedImage big = ImageIO.read(new File(backPicPath));
            // BufferedImage small = ImageIO.read(new File(fillPicPath));
            BufferedImage small = code;
            Graphics2D g = big.createGraphics();
    
            //二维码或小图在大图的左上角坐标
            int x = (big.getWidth() - small.getWidth()) / 2;
            int y = (big.getHeight() - small.getHeight() - 100);
            g.drawImage(small, x, y, small.getWidth(), small.getHeight(), null);
            g.dispose();
            //为了保证大图背景不变色，formatName必须为"png"
    
            ByteArrayOutputStream bs = new ByteArrayOutputStream();
            imOut = ImageIO.createImageOutputStream(bs);
            ImageIO.write(big, "png", imOut);
            InputStream in = new ByteArrayInputStream(bs.toByteArray());
    
            byte[] bytes = new byte[in.available()];
            in.read(bytes);
            String base64 = Base64.getEncoder().encodeToString(bytes);
            System.out.println(base64);
    
            return "data:image/jpeg;base64," + base64;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
    
    /* 
     * createImage 
     * @description：生成二维码
     * @author 李阳
     * @date 2018/12/13
     * @params [content 二维码内容, logoImgPath 中间logo, needCompress 是否压缩]
     * @return java.awt.image.BufferedImage
     */
    private static BufferedImage createImage(String content, String logoImgPath, boolean needCompress) throws IOException, WriterException {
        Hashtable<EncodeHintType, Object> hints = new Hashtable<EncodeHintType, Object>();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
        hints.put(EncodeHintType.MARGIN, 1);
        //200是定义的二维码或小图片的大小
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, 200, 200, hints);
        int width = bitMatrix.getWidth();
        int height = bitMatrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        //循环遍历每一个像素点
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
            }
        }
        // 没有logo
        if (logoImgPath == null || "".equals(logoImgPath)) {
            return image;
        }
    
        // 插入logo
        insertImage(image, logoImgPath, needCompress);
        return image;
    }
    
    /* 
     * insertImage 
     * @description：二维码插入logo
     * @author 李阳
     * @date 2018/12/13
     * @params [source, logoImgPath, needCompress]
     * @return void
     */
    private static void insertImage(BufferedImage source, String logoImgPath, boolean needCompress) throws IOException {
        File file = new File(logoImgPath);
        if (!file.exists()) {
            return;
        }
    
        Image src = ImageIO.read(new File(logoImgPath));
        int width = src.getWidth(null);
        int height = src.getHeight(null);
        //处理logo
        if (needCompress) {
            if (width > WIDTH) {
                width = WIDTH;
            }
    
            if (height > HEIGHT) {
                height = HEIGHT;
            }
    
            Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
            BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics gMaker = tag.getGraphics();
            gMaker.drawImage(image, 0, 0, null); // 绘制缩小后的图
            gMaker.dispose();
            src = image;
        }
    
        // 在中心位置插入logo
        Graphics2D graph = source.createGraphics();
        int x = (200 - width) / 2;
        int y = (200 - height) / 2;
        graph.drawImage(src, x, y, width, height, null);
        Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
        graph.setStroke(new BasicStroke(3f));
        graph.draw(shape);
        graph.dispose();
    }
    
    public static final void main(String[] args) throws IOException, WriterException {
        BufferedImage code = createImage("https://my.oschina.net/kevin2kelly", null, false);
        combineCodeAndPicToFile("C:/Users/kevin/Desktop/无标题.png", code);
        combineCodeAndPicToBase64("C:/Users/kevin/Desktop/无标题.png", code);
    }