链接转化成二维码

需要的jar包：

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

java代码：

　　public static void main(String[] args) {
        String url = "http://www.baidu.com";
        String path = FileSystemView.getFileSystemView().getHomeDirectory() + File.separator + "testQrcode";
        String fileName = "二维码.jpg";
        createQrCode(url, path, fileName);
    }
 
    public static String createQrCode(String url, String path, String fileName) {
        try {
            Map<EncodeHintType, String> hints = new HashMap<EncodeHintType, String>();
            hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
            //700*700 是分辨率
            BitMatrix bitMatrix = new MultiFormatWriter().encode(url, BarcodeFormat.QR_CODE, 700, 700, 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("搞定：" + file);
            }
 
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
 
    public static void writeToFile(BitMatrix matrix, String format, File file) throws IOException {
        BufferedImage image = toBufferedImage(matrix);
        if (!ImageIO.write(image, format, file)) {
            throw new IOException("不能写一个图像的格式 " + format + " 到 " + file);
        }
    }
 
    public static void writeToStream(BitMatrix matrix, String format, OutputStream stream) throws IOException {
        BufferedImage image = toBufferedImage(matrix);
        if (!ImageIO.write(image, format, stream)) {
            throw new IOException("不能写一个图像的格式 " + format);
        }
    }
 
    private static final int BLACK = 0xFF000000;//二维码颜色
    private static final int WHITE = 0xFFFFFFFF;//背景颜色
    //private static final int BLACK = 22561;
    //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;
    }

转载至：https://blog.csdn.net/liweizhong193516/article/details/80861192