1、pom中引入组件

<dependency><groupId>com.google.zxing</groupId><artifactId>core</artifactId><version>3.4.1</version>
</dependency>

2、代码实现

    // 生成二维码public String jumpToQRcodeGen(String url) {int width = 300; // 二维码的宽度int height = 300; // 二维码的高度String result="";// 定义二维码参数Map<EncodeHintType, Object> hints = new HashMap<>();hints.put(EncodeHintType.CHARACTER_SET, "UTF-8"); // 设置字符集try {BitMatrix bitMatrix = new MultiFormatWriter().encode(url, BarcodeFormat.QR_CODE, width, height, hints);BufferedImage bufferedImage = toImage(bitMatrix);// 转换为 Base64try (ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {ImageIO.write(bufferedImage, "png", outputStream);byte[] qrCodeBytes = outputStream.toByteArray();result = Base64.getEncoder().encodeToString(qrCodeBytes);} catch (Exception e) {e.printStackTrace();}return result;} catch (Exception e) {throw new RuntimeException(e);}}public static BufferedImage toImage(BitMatrix matrix) {final int width = matrix.getWidth();final int height = matrix.getHeight();BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);for (int x = 0; x < width; x++) {for (int y = 0; y < height; y++) {image.setRGB(x, y, matrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF); // 设置像素点颜色}}return image;}