Java 使用zxing生成二维码并转换为base64

maven导入jar包：

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

代码：

            QRCodeWriter qrCodeWriter = new QRCodeWriter();
            //设置二维码图片宽高
            BitMatrix bitMatrix = qrCodeWriter.encode( "二维码包含内容", BarcodeFormat.QR_CODE,600, 600);
            //输出到指定路径
//          Path path = FileSystems.getDefault().getPath("C:/Users/admin/Desktop/MyQRCode.png");
//          MatrixToImageWriter.writeToPath(bitMatrix1,"PNG",path);
            // 写到输出流
            outputStream = new ByteArrayOutputStream();
            MatrixToImageWriter.writeToStream(bitMatrix, "PNG", outputStream);
            //转换为base64
            Base64.Encoder encoder1 = Base64.getEncoder();
            String qrCodeImage = "data:image/jpeg;base64,"+encoder1.encodeToString(outputStream.toByteArray());