Zxing 生成二维码嵌套logo，并输出到浏览器

        <!-- 条形码、二维码生成  --><dependency><groupId>com.google.zxing</groupId><artifactId>core</artifactId><version>3.0.0</version></dependency><dependency><groupId>com.google.zxing</groupId><artifactId>javase</artifactId><version>3.0.0</version></dependency>

//如果当前用户有渠道，则生成二维码String id = UserUtils.getUser().getId();LoanChannel channelByUserId = loanChannelService.getChannelByUserId(id);if (channelByUserId!=null){JSONObject json = new JSONObject();json.put("channelName",channelByUserId.getName());json.put("channelNo", channelByUserId.getChannelNo());String content = json.toJSONString();// 内容int width = 210; // 图像宽度int height = 200; // 图像高度String format = "png";// 图像类型Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");//设置纠错级别  hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);BitMatrix bitMatrix = null;// 生成矩阵try {bitMatrix = new MultiFormatWriter().encode(content,BarcodeFormat.QR_CODE, width, height, hints);/** 定义一张空白缓冲流图片 */BufferedImage image = new BufferedImage(bitMatrix.getWidth(), bitMatrix.getHeight(),BufferedImage.TYPE_INT_RGB);/** 循环二维码字节转化对象中所有点 矩阵转image*/for (int x = 0; x < bitMatrix.getWidth(); x++){for (int y = 0; y < bitMatrix.getHeight(); y++){/** 获取其中一点，判断它是黑色还是白色 true:黑色 false:白色 */int rgb = bitMatrix.get(x, y) ? 0x000000 : 0xffffff;/** 在空白图片绘制一点 */image.setRGB(x, y, rgb);}}
　　　　　　　　　　//加载logoInputStream stream = this.getClass().getResourceAsStream("/images/logo.png");BufferedImage logo = ImageIO.read(stream);
　　　　　　　　　　//嵌套logoBufferedImage logoMatrix = LogoConfig.LogoMatrix(image, logo);ImageIO.write(logoMatrix,format,response.getOutputStream());} catch (WriterException e) {logger.info("输出二维码错误",e);e.printStackTrace();} catch (IOException e) {logger.info("输出二维码错误",e);e.printStackTrace();}String data=channelByUserId.getName()+"-"+channelByUserId.getChannelNo();return data;}return "";}

public class LogoConfig{/*** 设置 logo* @param matrixImage 源二维码图片* @return 返回带有logo的二维码图片* @throws IOException* @author Administrator sangwenhao*/public static BufferedImage LogoMatrix(BufferedImage matrixImage, BufferedImage logo) throws IOException{/*** 读取二维码图片，并构建绘图对象*/Graphics2D g2 = matrixImage.createGraphics();int matrixWidth = matrixImage.getWidth();int matrixHeigh = matrixImage.getHeight();//开始绘制图片g2.drawImage(logo,matrixWidth/5*2,matrixHeigh/5*2, matrixWidth/5, matrixHeigh/5, null);//绘制BasicStroke stroke = new BasicStroke(5,BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND);g2.setStroke(stroke);// 设置笔画对象//指定弧度的圆角矩形RoundRectangle2D.Float round = new RoundRectangle2D.Float(matrixWidth/5*2, matrixHeigh/5*2, matrixWidth/5, matrixHeigh/5,20,20);g2.setColor(Color.white);g2.draw(round);// 绘制圆弧矩形//设置logo 有一道灰色边框BasicStroke stroke2 = new BasicStroke(1,BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND);g2.setStroke(stroke2);// 设置笔画对象RoundRectangle2D.Float round2 = new RoundRectangle2D.Float(matrixWidth/5*2+2, matrixHeigh/5*2+2, matrixWidth/5-4, matrixHeigh/5-4,20,20);g2.setColor(new Color(128,128,128));g2.draw(round2);// 绘制圆弧矩形*/
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);matrixImage.flush() ;g2.dispose();return matrixImage ;}}

<a id="fileName" href="${ctx}/loan/loanChannel/createQRCode" download="渠道.png"><img src="${ctx}/loan/loanChannel/createQRCode">
</a>