public class QRCodeUtil {/*** 生成二维码<br>* 二维码的净宽度必然等于二维码的净高度<br>* 如果需要尺寸特别精准的二维码，可删除返回BufferedImage的白边并缩放图片为指定尺寸(资料很多且暂时没有场景，不再处理)** @param content*            二维码内容* @param width*            整个二维码图片宽度(二维码净宽度+预留白边)* @param height*            整个二维码图片高度(二维码经高度+预留白边)* @param logoPath*            logo路径，为空或文件不存在则不添加logo* @param isColor*            是否彩色二维码(此工具类颜色固化，如要定制颜色可增加参数扩充工具类) 默认为true* @return*/public static BufferedImage encodeQRcode(String content, int width, int height, String logoPath, Boolean isColor) {try {// 生成二维码Map<EncodeHintType, Object> hints = new HashMap<EncodeHintType, Object>();hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");// 编码hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);// 最高容错级别hints.put(EncodeHintType.MARGIN, 0);// 边框留白最小(无法精准控制)MultiFormatWriter mutiWriter = new MultiFormatWriter();BitMatrix matrix = mutiWriter.encode(content,BarcodeFormat.QR_CODE, width, height, hints);// 根据左上角定位方块坐标，确定左上角定位方块范围int[] topLeftPoint = matrix.getTopLeftOnBit();int leftTopX = topLeftPoint[0];// 左上角方块左上角X坐标int leftTopY = topLeftPoint[1];// 左上角方块左上角Y坐标int rightBottomX = 0;// 左上角方块右下角X坐标int rightBottomY = 0;// 左上角方块右下角Y坐标for (int x = topLeftPoint[0]; x < matrix.getWidth(); x++) {if (!matrix.get(x, topLeftPoint[1])) {rightBottomX = x;break;}}for (int y = topLeftPoint[1]; y < matrix.getHeight(); y++) {if (!matrix.get(topLeftPoint[0], y)) {rightBottomY = y;break;}}// LOGO生成int logoWidth = rightBottomX - leftTopX;// LOGO宽度int logoHeight = rightBottomY - leftTopY;// LOGO高度int logoHalfWidth = logoWidth / 2;// LOGO宽度一半int logoFrameWidth = 1;// LOGO边框宽度BufferedImage logoImage = genLogo(logoPath, logoWidth, logoHeight,true);int[][] logoPixels = new int[logoWidth][logoHeight];if (logoImage != null) {for (int i = 0; i < logoImage.getWidth(); i++) {for (int j = 0; j < logoImage.getHeight(); j++) {logoPixels[i][j] = logoImage.getRGB(i, j);}}}// 二维矩阵转为一维像素数组int halfW = matrix.getWidth() / 2;int halfH = matrix.getHeight() / 2;int[] pixels = new int[width * height];for (int y = 0; y < matrix.getHeight(); y++) {for (int x = 0; x < matrix.getWidth(); x++) {if (x > 0 && x < rightBottomX && y > 0 && y < rightBottomY) {// 左上角定位方块颜色,根据自己需要调整颜色范围和空白填充颜色Color color = new Color(0, 0, 0);// 黑色if (isColor == null || isColor) {// 彩色二维码color = new Color(231, 144, 56);// 此处颜色固化，如果需要可扩展}int colorInt = color.getRGB();pixels[y * width + x] = matrix.get(x, y) ? colorInt: 16777215;} else if (logoImage != null && x > halfW - logoHalfWidth&& x < halfW + logoHalfWidth&& y > halfH - logoHalfWidth&& y < halfH + logoHalfWidth) {// 添加LOGO(如果存在)pixels[y * width + x] = logoPixels[x - halfW+ logoHalfWidth][y - halfH + logoHalfWidth];} else if (logoImage != null&& ((x > halfW - logoHalfWidth - logoFrameWidth&& x < halfW - logoHalfWidth+ logoFrameWidth&& y > halfH - logoHalfWidth- logoFrameWidth && y < halfH+ logoHalfWidth + logoFrameWidth)|| (x > halfW + logoHalfWidth- logoFrameWidth&& x < halfW + logoHalfWidth+ logoFrameWidth&& y > halfH - logoHalfWidth- logoFrameWidth && y < halfH+ logoHalfWidth + logoFrameWidth)|| (x > halfW - logoHalfWidth- logoFrameWidth&& x < halfW + logoHalfWidth+ logoFrameWidth&& y > halfH - logoHalfWidth- logoFrameWidth && y < halfH- logoHalfWidth + logoFrameWidth) || (x > halfW- logoHalfWidth - logoFrameWidth&& x < halfW + logoHalfWidth+ logoFrameWidth&& y > halfH + logoHalfWidth- logoFrameWidth && y < halfH+ logoHalfWidth + logoFrameWidth))) {// 添加LOGO四周边框(如果存在)Color color = new Color(0, 0, 0);// 黑色if (isColor == null || isColor) {// 彩色二维码// 此处固化为渐变颜色，如有需要可扩展int R = (int) (50 - (50.0 - 13.0)/ matrix.getHeight() * (y + 1));int G = (int) (165 - (165.0 - 72.0)/ matrix.getHeight() * (y + 1));int B = (int) (162 - (162.0 - 107.0)/ matrix.getHeight() * (y + 1));color = new Color(R, G, B);}int colorInt = color.getRGB();pixels[y * width + x] = colorInt;} else {// 其他部分二维码颜色Color color = new Color(0, 0, 0);// 黑色if (isColor == null || isColor) {// 彩色二维码// 此处固化为渐变颜色，如有需要可扩展int R = (int) (50 - (50.0 - 13.0)/ matrix.getHeight() * (y + 1));int G = (int) (165 - (165.0 - 72.0)/ matrix.getHeight() * (y + 1));int B = (int) (162 - (162.0 - 107.0)/ matrix.getHeight() * (y + 1));color = new Color(R, G, B);}int colorInt = color.getRGB();// 此处可以修改二维码的颜色，可以分别制定二维码和背景的颜色；pixels[y * width + x] = matrix.get(x, y) ? colorInt: 16777215;}}}BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);image.getRaster().setDataElements(0, 0, width, height, pixels);return image;} catch (WriterException e) {return null;}}/*** 解析条形码或二维码** @param filePath*            图片路径* @return*/public static Map<String, String> decode(String filePath) {try {if (filePath == null || filePath.equals("")) {return null;}File file = new File(filePath);if (!file.exists()) {return null;}BufferedImage image = ImageIO.read(new File(filePath));BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);Binarizer binarizer = new HybridBinarizer(source);BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);Map<DecodeHintType, Object> hints = new HashMap<DecodeHintType, Object>();hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");Result result = new MultiFormatReader().decode(binaryBitmap, hints);// 对图像进行解码Map<String, String> resultMap = new HashMap<String, String>();resultMap.put("encode", result.getBarcodeFormat().name());resultMap.put("text", result.getText());return resultMap;} catch (Exception e) {return null;}}/*** 把传入的原始LOGO图像按高度和宽度进行缩放，生成符合要求的图标** @param logoPath*            logo路径* @param height*            目标高度* @param width*            目标宽度* @param hasFiller*            比例不对时是否需要补白：true为补白; false为不补白;*/private static BufferedImage genLogo(String logoPath, int height, int width, boolean hasFiller) {if (logoPath == null || logoPath.equals("")) {return null;}try {double ratio = 0.0; // 缩放比例File file = new File(logoPath);BufferedImage srcImage = ImageIO.read(file);Image destImage = srcImage.getScaledInstance(width, height,BufferedImage.SCALE_SMOOTH);// 计算比例if ((srcImage.getHeight() > height)|| (srcImage.getWidth() > width)) {if (srcImage.getHeight() > srcImage.getWidth()) {ratio = (new Integer(height)).doubleValue()/ srcImage.getHeight();} else {ratio = (new Integer(width)).doubleValue()/ srcImage.getWidth();}AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(ratio, ratio), null);destImage = op.filter(srcImage, null);}if (hasFiller) {// 补白BufferedImage image = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);Graphics2D graphic = image.createGraphics();graphic.setColor(Color.white);graphic.fillRect(0, 0, width, height);if (width == destImage.getWidth(null)) {graphic.drawImage(destImage, 0,(height - destImage.getHeight(null)) / 2,destImage.getWidth(null),destImage.getHeight(null), Color.white, null);} else {graphic.drawImage(destImage,(width - destImage.getWidth(null)) / 2, 0,destImage.getWidth(null),destImage.getHeight(null), Color.white, null);}graphic.dispose();destImage = image;}return (BufferedImage) destImage;} catch (IOException e) {return null;}}public static String encode(String content, int width, int height, String logoPath, Boolean isColor,String path) throws Exception {BufferedImage image = encodeQRcode(content, width,height, logoPath, isColor);File imgFile = new File(path);ImageIO.write(image, "jpg", imgFile);// 存储return imgFile.getAbsolutePath();}/*** @Author haojl* @Description 生成二维码，并返回前端页面* @Date 2021/6/25 16:39* @Param [宽度, 高度, 内容, response]* @return void**/public static void createQRCode(int width, int height, String content, HttpServletResponse response) throws Exception {String format = "png";ServletOutputStream out = response.getOutputStream();Map<EncodeHintType,Object> config = new HashMap<>();config.put(EncodeHintType.CHARACTER_SET,"UTF-8");config.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);config.put(EncodeHintType.MARGIN, 0);BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE,width,height,config);MatrixToImageWriter.writeToStream(bitMatrix,format,out);System.out.println("二维码生成完毕，已经输出到页面中。");}/*** @Author haojl* @Description 本地生成生成二维码* @Date 2021/7/15 17:34* @Param [width, height, json, fileName]* @return void**/public static void createQRCodeImage(int width, int height, String json, String fileName) throws Exception {String format = "png";Map<EncodeHintType,Object> config = new HashMap<>();config.put(EncodeHintType.CHARACTER_SET,"UTF-8");config.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M);config.put(EncodeHintType.MARGIN, 0);BitMatrix bitMatrix = new MultiFormatWriter().encode(json, BarcodeFormat.QR_CODE,width,height,config);File file = new File(fileName);if (!file.exists()) {file.createNewFile();}FileOutputStream outputStream = new FileOutputStream(file);MatrixToImageWriter.writeToStream(bitMatrix,format,outputStream);System.out.println("二维码生成完毕:"+ fileName);}//获得图片的base64码public static String getImageBase(String src) {if(src==null||src==""){return "";}File file = new File(getRequest().getRealPath("/")+src.replace(getRequest().getContextPath(), ""));if(!file.exists()) {return "";}InputStream in = null;byte[] data = null;try {in = new FileInputStream(file);} catch (FileNotFoundException e1) {e1.printStackTrace();}try {data = new byte[in.available()];in.read(data);in.close();} catch (IOException e) {e.printStackTrace();}BASE64Encoder encoder = new BASE64Encoder();return encoder.encode(data);}public static void main(String[] args) throws Exception {BufferedImage image = QRCodeUtil.encodeQRcode("OO", 512, 512,"", false);// 生成二维码ImageIO.write(image, "jpg", new File("E:\\test.jpg"));// 存储System.out.println(decode("E:\\test.jpg"));// 解析}
}