1.导入依赖
<dependency> <groupId>com.google.zxing</groupId> <artifactId>core</artifactId> <version>3.3.0</version> </dependency>
2.工具类qrcodeutils
public class QrcodeUtils { public static void downloadQrcode(String content, HttpServletResponse response, HttpServletRequest request) throws Exception { //转换字符,避免中文乱码问题 content = new String(content.getBytes("UTF-8"),"ISO-8859-1"); Hashtable<EncodeHintType, ErrorCorrectionLevel> hintMap = new Hashtable<EncodeHintType, ErrorCorrectionLevel>(); hintMap.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M); // 矫错级别 QRCodeWriter qrCodeWriter = new QRCodeWriter(); //创建比特矩阵(位矩阵)的QR码编码的字符串 BitMatrix byteMatrix = qrCodeWriter.encode(content, BarcodeFormat.QR_CODE, 900, 900, hintMap); // 使BufferedImage勾画QRCode (matrixWidth 是行二维码像素点) int matrixWidth = byteMatrix.getWidth(); BufferedImage image = new BufferedImage(900, 900, BufferedImage.TYPE_INT_RGB); image.createGraphics(); Graphics2D graphics = (Graphics2D) image.getGraphics(); graphics.setColor(Color.WHITE); graphics.fillRect(0, 0, matrixWidth, matrixWidth); // 使用比特矩阵画并保存图像 graphics.setColor(Color.BLACK); for (int i = 0; i < matrixWidth; i++){ for (int j = 0; j < matrixWidth; j++){ if (byteMatrix.get(i, j)){ graphics.fillRect(i, j, 1, 1); } } } /** * 将image转换成流 */ response.setHeader("Content-Type","application/octet-stream"); response.setHeader("Content-Disposition","attachment;filename=qrcode.jpg"); ByteArrayOutputStream baos = new ByteArrayOutputStream(); ImageIO.write(image, "JPEG", baos); baos.flush(); byte[] imageInByte = baos.toByteArray(); baos.close(); response.getOutputStream().write(imageInByte); response.getOutputStream().flush(); response.getOutputStream().close(); } }
3.使用
3.1控制器:
@GetMapping("/downLoadQrcode") public ResultBean<Void> downLoadQrcode(Long shopId, HttpServletResponse response, HttpServletRequest request){ try { qrcoceBusiness.downloadQrcode("http://wx1.great-info.tech/?shopId="+shopId,response,request); } catch (Exception e) { e.printStackTrace(); return new ResultBean<>(ServiceCode.DELETE_FAILURE,ServiceCode.DELETE_FAILURE_MSG); } return new ResultBean<>(ServiceCode.OK,ServiceCode.OK_DEFAULT_MSG); }
3.2调用utils
public void downloadQrcode(String content, HttpServletResponse response, HttpServletRequest request) throws Exception { QrcodeUtils.downloadQrcode(content,response,request); }