java根据跳转链接生成二维码

心已赠人 2022-01-26 05:43 249阅读 0赞

需要的jar包：

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

java代码：

package com.dzqc.yx.controller;
     
    import com.google.zxing.BarcodeFormat;
    import com.google.zxing.EncodeHintType;
    import com.google.zxing.MultiFormatWriter;
    import com.google.zxing.common.BitMatrix;
     
    import javax.imageio.ImageIO;
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.IOException;
    import java.io.OutputStream;
    import java.util.HashMap;
    import java.util.Map;
     
    public class QrCodeUtil {
        public static void main(String[] args) {
            //生成链接
            String url = "http://www.baidu.com";
            //配置生成路径
            String path = "d:测试二维码/photo/";
            //生成文件名称  
            String fileName = "二维码.png";
            createQrCode(url, path, fileName);
        }
     
        public static String createQrCode(String url, String path, String fileName) {
            try {
                Map<EncodeHintType, String> hints = new HashMap<>();
                hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
                BitMatrix bitMatrix = new MultiFormatWriter().encode(url, BarcodeFormat.QR_CODE, 400, 400, hints);
                File file = new File(path, fileName);
                if (file.exists() || ((file.getParentFile().exists() || file.getParentFile().mkdirs()) && file.createNewFile())) {
                    writeToFile(bitMatrix, "jpg", file);
                    System.out.println("成功：" + file);
                }
     
            } catch (Exception e) {
                e.printStackTrace();
            }
            return null;
        }
     
        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);
            }
        }
     
        static void writeToStream(BitMatrix matrix, String format, OutputStream stream) throws IOException {
            BufferedImage image = toBufferedImage(matrix);
            if (!ImageIO.write(image, format, stream)) {
                throw new IOException("Could not write an image of format " + format);
            }
        }
     
        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;
        }
    }

然后打开保存二维码的对应地址

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2JhaWR1XzQxNjYwMTgy_size_16_color_FFFFFF_t_70][]

好了   这就成功了。

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2JhaWR1XzQxNjYwMTgy_size_16_color_FFFFFF_t_70]: /images/20220126/19b306353c54474a88e36d0210b5ab59.png