Java利用url生成二维码

谁借莪１个温暖的怀抱￠ 2022-12-05 09:51 332阅读 0赞

# 一、二维码生成工具类，输入为扫描二维码跳转的url,输出是转化后的二维码图片 #

## 1.导入依赖包： ##

<dependency>
        <groupId>com.google.zxing</groupId>
        <artifactId>core</artifactId>
        <version>3.3.0</version>
    </dependency>

## 2.代码实现： ##

/** * @author zx * @date 2020/9/7 * 生成二维码工具类 */
    public class QRCodeUtil { 
        private static final String CHARSET = "utf-8";
        private static final String FORMAT_NAME = "JPG";
        // 二维码尺寸
        private static final int QRCODE_SIZE = 300;
    
    
        /** * 生成二维码图片 * @param url 扫描二维码跳转地址 * @return * @throws Exception */
        public static BufferedImage createImage(String url) throws Exception { 
            Hashtable hints = new Hashtable();
            hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
            hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
            hints.put(EncodeHintType.MARGIN, 1);
            BitMatrix bitMatrix = new MultiFormatWriter().encode(url, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE,
                    hints);
            int width = bitMatrix.getWidth();
            int height = bitMatrix.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, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
                }
            }
            return image;
        }
    
        /** * 输出二维码 * @param url 扫描二维码跳转地址 * @param response * @throws Exception */
        public static void encode(String url, HttpServletResponse response)
                throws Exception { 
            BufferedImage image = QRCodeUtil.createImage(url);
            ImageIO.write(image, FORMAT_NAME, response.getOutputStream());
        }
    
    
    }

# 二、Java二维码的生成与解析：[java实现二维码的生成与解析][java]（感谢博主的分享，本文章生成二维码借鉴了该博主的文章） #

[java]: https://blog.csdn.net/jam_fanatic/article/details/82818857