URL转二维码

素颜马尾好姑娘i 2022-02-12 10:55 296阅读 0赞

参考: [https://blog.csdn.net/moshenglv/article/details/78933161][https_blog.csdn.net_moshenglv_article_details_78933161]

导入maven依赖

<dependency>
                <groupId>com.google.zxing</groupId>
                <artifactId>core</artifactId>
                <version>3.2.1</version>
            </dependency>
            <dependency>
                <groupId>com.google.zxing</groupId>
                <artifactId>javase</artifactId>
                <version>3.2.0</version>
            </dependency>

代码

package com.example.demotest.qrCode;
    
    import com.google.zxing.BarcodeFormat;
    import com.google.zxing.common.BitMatrix;
    import com.google.zxing.qrcode.QRCodeWriter;
    import org.apache.commons.lang3.StringUtils;
    
    import javax.imageio.ImageIO;
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.IOException;
    import java.util.UUID;
    
    public class UrlToQRCode {
    
        public static void main(String[] args) throws Exception {
            String url = "www.baidu.com";
            String qrCodePath = getErWeiCode(url);
            System.out.println(qrCodePath);
        }
    
        /**
         * 生成二维码，返回到页面上
         * @param url
         */
        public static String getErWeiCode(String url) throws Exception {
            if(StringUtils.isNotBlank(url)) {
                try {
                    int width = 200;
                    int height = 200;
                    QRCodeWriter writer = new QRCodeWriter();
                    BitMatrix bitMatrix = writer.encode(url, BarcodeFormat.QR_CODE, height, width);
                    String imgPath =  "E:\\qr\\" + UUID.randomUUID().toString() + ".png";
                    File file = new File(imgPath);
                    if (file.exists() || ((file.getParentFile().exists() || file.getParentFile().mkdirs()) && file.createNewFile())) {
                        writeToFile(bitMatrix, "png", file);
                        return file.getPath();
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
            throw new Exception("H5二维码生成失败!");
        }
    
        private static void writeToFile(BitMatrix matrix, String format, File file) throws IOException {
            BufferedImage image = toBufferedImage(matrix);
            if (!ImageIO.write(image, format, file)) {
                throw new IOException("Could not write an image of format " + format + " to " + file);
            }
        }
    
        private static final int BLACK = 0xFF000000;
        private static final int WHITE = 0xFFFFFFFF;
    
        private static BufferedImage toBufferedImage(BitMatrix matrix) {
            int width = matrix.getWidth();
            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) ? BLACK : WHITE);
                }
            }
            return image;
        }
    }

[https_blog.csdn.net_moshenglv_article_details_78933161]: https://blog.csdn.net/moshenglv/article/details/78933161