Java 生成带Logo和文字的二维码

ZXing 是一个开放源码的，用Java实现的多种格式的1D/2D条码图像处理库，它包含了联系到其他语言的端口。Zxing 可以实现使用手机的内置的摄像头完成条形码的扫描及解码。本章讲解用 ZXing 生成和扫码二维码。

在Java项目中pom.xml加入：

<dependency> <groupId>com.google.zxing</groupId> <artifactId>core</artifactId> <version>${version}</version></dependency><dependency> <groupId>com.google.zxing</groupId> <artifactId>javase</artifactId> <version>${version}</version></dependency>

当前最新版本是3.4.1，如果是Java开发的Android项目则引入 android-core 。

// 二维码内容String text = 'https://engr-z.com';// 二维码大小int width = 500, height = 500;// 二维码输出文件File file = new File('/home/engr-z/qrcode.png');QRCodeWriter writer = new QRCodeWriter();BitMatrix m = writer.encode(text, BarcodeFormat.QR_CODE, width, height);MatrixToImageWriter.writeToPath(m, 'png', file.toPath());

如果内容较多，需要增大二维码尺寸。尺寸小内容多，二维码图形越复杂越难识别。

// 二维码内容String text = 'https://engr-z.com';// 二维码大小int width = 500, height = 500;// 二维码参数CodeStyle style = new CodeStyle();style.setWidth(width);style.setHeight(height);Map<EncodeHintType, Object> hints = new HashMap<>();//内容编码格式hints.put(EncodeHintType.CHARACTER_SET, 'UTF-8');// 指定纠错等级hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);//设置二维码边的空度，非负数hints.put(EncodeHintType.MARGIN, 1);// 生成二维码图片QRCodeWriter writer = new QRCodeWriter();BitMatrix bm = writer.encode(text, BarcodeFormat.QR_CODE, style.getWidth(), style.getHeight(), hints);int margin = style.getMargin();int tempM = margin*2;int[] rec = bm.getEnclosingRectangle(); //获取二维码图案的属性int resWidth = rec[2] + tempM;int resHeight = rec[3] + tempM;BitMatrix resMatrix = new BitMatrix(resWidth, resHeight); // 按照自定义边框生成新的BitMatrixresMatrix.clear();for (int i = margin; i < resWidth - margin; i++) { //循环，将二维码图案绘制到新的bitMatrix中 for (int j = margin; j < resHeight - margin; j++){if (bm.get(i - margin + rec[0], j - margin + rec[1])){ resMatrix.set(i, j);} }}bm = resMatrix;int w = bm.getWidth();int h = bm.getHeight();BufferedImage qrcodeBuffImg = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);// 开始利用二维码数据创建Bitmap图片for (int x = 0; x < w; x++) { for (int y = 0; y < h; y++) {qrcodeBuffImg.setRGB(x, y, bm.get(x, y) ? style.getCodeColor() : style.getBackgroundColor()); }}/** * 读取Logo图片 */File logoFile = new File('/home/engr-z/logo.png');BufferedImage logo = ImageIO.read(logoFile);/** * 设置logo的大小，设置为二维码图片的20% */int widthLogo = logo.getWidth(null) > qrcodeBuffImg.getWidth() * 3 / 10 ? (qrcodeBuffImg.getWidth() * 3 / 10): logo.getWidth(null),heightLogo = logo.getHeight(null) > qrcodeBuffImg.getHeight() * 3 / 10 ? (qrcodeBuffImg.getHeight() * 3 / 10) : logo.getWidth(null);/** * logo在二维码的位置 */int x = (qrcodeBuffImg.getWidth() - widthLogo) / 2;int y = (qrcodeBuffImg.getHeight() - heightLogo) / 2;Graphics2D qrcodeOutg = qrcodeBuffImg.createGraphics();// 把logo写到二维码图片中间qrcodeOutg.drawImage(logo, x, y, widthLogo, heightLogo, null);qrcodeOutg.dispose();qrcodeBuffImg.flush();// 新的图片，把带logo的二维码下面加上文字String desc = 'https://engr-z.com';int textHeight = 26;int textMargin = 10;BufferedImage outImage = new BufferedImage(qrcodeBuffImg.getWidth(), qrcodeBuffImg.getHeight() + textHeight + (textMargin * 2), BufferedImage.TYPE_4BYTE_ABGR);Graphics2D outg = outImage.createGraphics();// 画二维码到新的面板outg.drawImage(qrcodeBuffImg, 0, 0, qrcodeBuffImg.getWidth(), qrcodeBuffImg.getHeight(), null);outg.setFont(new Font('宋体', Font.BOLD, 26)); // 字体、字型、字号int strWidth = outg.getFontMetrics().stringWidth(desc);outg.setColor(Color.BLACK);outg.drawString(desc, (outImage.getWidth() - strWidth) / 2, outImage.getHeight() - textMargin);outg.dispose();// 二维码输出文件File file = new File('/home/engr-z/qrcode.png');ImageIO.write(outImage, 'png', file);

CodeStyle是我封装的类，用来设置二维码样式：

/** * @author Engr-Z * @since 2020/12/18 */@Datapublic class CodeStyle { /** * 背景颜色，如：0xFFFFFFFF */ private int backgroundColor = 0xFFFFFFFF; /** * 码颜色，如：0xFF000000 */ private int codeColor = 0xFF000000; /** * 二维码宽，px */ private int width; /** * 二维码高，px */ private int height; /** * 边框大小 */ private int margin = 5;}

以下是我执行生成的二维码：

File qrcodeFile = new File('D:/qrcode.png');BufferedImage qrcodeImg = ImageIO.read(qrcodeFile);MultiFormatReader formatReader = new MultiFormatReader();//读取指定的二维码文件BinaryBitmap binaryBitmap= new BinaryBitmap(new HybridBinarizer(new BufferedImageLuminanceSource(qrcodeImg)));//定义二维码参数Map<DecodeHintType, Object> hints= new HashMap<>();hints.put(DecodeHintType.CHARACTER_SET, 'utf-8');// 读取Result result = formatReader.decode(binaryBitmap, hints);log.info('格式类型：{}', result.getBarcodeFormat());log.info('二维码内容：{}', result.getText());链接

ZXing GitHub：https://github.com/zxing/zxing

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