Java 使用zxing生成二維碼並轉換為base64

maven導入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>

代碼：

            QRCodeWriter qrCodeWriter = new QRCodeWriter();
            //設置二維碼圖片寬高
            BitMatrix bitMatrix = qrCodeWriter.encode( "二維碼包含內容", BarcodeFormat.QR_CODE,600, 600);
            //輸出到指定路徑
//          Path path = FileSystems.getDefault().getPath("C:/Users/admin/Desktop/MyQRCode.png");
//          MatrixToImageWriter.writeToPath(bitMatrix1,"PNG",path);
            // 寫到輸出流
            outputStream = new ByteArrayOutputStream();
            MatrixToImageWriter.writeToStream(bitMatrix, "PNG", outputStream);
            //轉換為base64
            Base64.Encoder encoder1 = Base64.getEncoder();
            String qrCodeImage = "data:image/jpeg;base64,"+encoder1.encodeToString(outputStream.toByteArray());