java 根据url 生成二维码

Posted 2021-06-22 辉哥哥~

 /**
     * 生成不带白边的二维码
     *
     * @param content 二维码内容(目标url)
     * @param qrCodePath 生成的二维码地址(最终保存地址)
     * @throws Exception 异常
     */
    public static void generatorQrCode(String content, String qrCodePath) throws Exception {
        Map<EncodeHintType, Object> hints = new HashMap<>();
        hints.put(EncodeHintType.MARGIN, 0);
        BitMatrix bitMatrix = new QRCodeWriter().encode(content, BarcodeFormat.QR_CODE, 256, 256, hints);
        // 去白边
        int[] rec = bitMatrix.getEnclosingRectangle();
        int resWidth = rec[2] + 1;
        int resHeight = rec[3] + 1;
        BitMatrix resMatrix = new BitMatrix(resWidth, resHeight);
        resMatrix.clear();
        for (int i = 0; i < resWidth; i++) {
            for (int j = 0; j < resHeight; j++) {
                if (bitMatrix.get(i + rec[0], j + rec[1])) {
                    resMatrix.set(i, j);
                }
            }
        }

        int width = resMatrix.getWidth();
        int height = resMatrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                if (resMatrix.get(x, y)) {
                    //                    image.setRGB(x, y, Color.BLACK.getRGB());
                    image.setRGB(x, y, -16777216);
                } else {
                    //                    image.setRGB(x, y, Color.WHITE.getRGB());
                    image.setRGB(x, y, -1);
                }
            }
        }
        ImageIO.write(image, "png", new File(qrCodePath));
    }

@Test
    public void test() {
        String qrCodePath = "https://www.baidu.com";
        String qrCodeLocalPath = "C:\\\\Users\\\\Administrator\\\\Pictures\\\\测试\\\\百度首页22.png";
        try {
            generatorQrCode(qrCodePath, qrCodeLocalPath);
        } catch (Exception e) {
            log.info("error :{}", JSON.toJSON(e));
        }
    }