java – 带条码Code128的JasperReports(Barcode4J)：PNG与PDF不

我正在使用Jasper模板和Barcode4J的条形码元素“Code128”打印带有以下编号“1000049722ABCD2F”的标签作为条形码.以PDF格式打印,条形码完美且可扫描.
打印相同的条形码作为PNG文件,条形码不可扫描,它明显不同于PDF条形码：

相同的条形码：PDF(图像的上半部分)和PNG(图像的下半部分)：

以下代码用于生成PDF条形码：

byte[] data = JasperExportManager.exportReportToPdf(jasperPrint);

要生成PNG,它并不那么简单：

ByteArrayOutputStream byteOutputStream = new ByteArrayOutputStream();
    ImageOutputStream imageOutputStream = ImageIO.createImageOutputStream(byteOutputStream);
    ImageWriter imageWriter = ImageIO.getImageWritersBySuffix("png").next();
    imageWriter.setOutput(imageOutputStream);

    float zoom = getZoomFactor(jasperPrint);

    BufferedImage image = new BufferedImage(
            (int)(jasperPrint.getPageWidth() * zoom ) + 1,(int)(jasperPrint.getPageHeight() * zoom) + 1,BufferedImage.TYPE_INT_RGB);

    JRGraphics2DExporterNoAntialias exporter = new JRGraphics2DExporterNoAntialias();
    exporter.setParameter(JRExporterParameter.JASPER_PRINT,jasperPrint);
    exporter.setParameter(JRGraphics2DExporterParameter.GRAPHICS_2D,image.getGraphics());
    exporter.setParameter(JRExporterParameter.PAGE_INDEX,Integer.valueOf(page));
    exporter.setParameter(JRGraphics2DExporterParameter.ZOOM_RATIO,new Float(zoom));
    exporter.exportReport();

    IIOMetadata imageMetaData = imageWriter.getDefaultImageMetadata(new ImageTypeSpecifier(image),null);

    // DPI = 200,inch = 25.4
    double dotsPerMilli = 200 / 25.4;

    IIOMetadataNode horiz = new IIOMetadataNode("HorizontalPixelSize");
    horiz.setAttribute("value",Double.toString(dotsPerMilli));

    IIOMetadataNode vert = new IIOMetadataNode("VerticalPixelSize");
    vert.setAttribute("value",Double.toString(dotsPerMilli));

    IIOMetadataNode dim = new IIOMetadataNode("Dimension");
    dim.appendChild(horiz);
    dim.appendChild(vert);

    IIOMetadataNode root = new IIOMetadataNode("javax_imageio_1.0");
    root.appendChild(dim);

    imageMetaData.mergeTree("javax_imageio_1.0",root);

    imageWriter.write(null,new IIOImage(image,null,imageMetaData),null);
    imageOutputStream.close();
    imageWriter.dispose();
    byte[] data = byteOutputStream.toByteArray();

我在用：
barcode4j-2.1 / jasperreports-5.0.0 / 200 DPI是我的标签打印机所需的尺寸

我试图改变一些设置(BufferedImage.TYPE值,条形码宽度,烧烤条形码128B等),但PDF和PNG条形码之间总是存在差异.

目标：PNG条形码应与PDF条形码完全相同.

任何人都可以帮我这个吗？我将不胜感激！