首先下载Qrcode jar包 下载地址
public void tesclearRecttImgQr() throws IOException {

    Qrcode x = new Qrcode();
    //N代表数字，A代表a-z，B代表其他字符
    x.setQrcodeEncodeMode('B');
    //设置纠错等级
    x.setQrcodeErrorCorrect('L');
    //设置版本号(1-40)
    x.setQrcodeVersion(3);

    String qrDate = "https://developer.aliyun.com/";//地址
    int width = 50;//宽度
    int height = 50;//宽度
    int pixoff = 0;//偏移量

    BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
    Graphics2D gs = bufferedImage.createGraphics();
    gs.setBackground(Color.WHITE);
    gs.setColor(Color.BLACK);
    gs.clearRect(0, 0, width, height);

    byte[] d = qrDate.getBytes("UTF-8");
    if (d.length > 0 && d.length < 120) {
        boolean[][] s = x.calQrcode(d);
        for (int i = 0; i < s.length; i++) {
            for (int j = 0; j < s.length; j++) {
                if (s[j][i]) {
                    gs.fillRect(j, i, 1, 1);
                }
            }
        }
    }

    gs.dispose();
    bufferedImage.flush();
    ImageIO.write(bufferedImage, "png", new File("C:/图片地址.png"));

}