java - 条形码 png 打印在尺寸为 40 毫米 x 15 毫米的标签上的图像在打印且未扫描时会缩小至 20 毫米 x 10 毫米

Question

我遇到这个问题，我正在使用 code128 生成条形码并将其保存在 PNG 文件中。当将相同的 PNG 文件提供给具有所需文档属性的打印机作业以在所需尺寸的标签上打印时，尺寸会缩小并且不会被扫描。

提供的实际打印尺寸 - 40 毫米 x 15 毫米。标签上打印的尺寸 - 20mm x 10mm

我将此属性添加到 PrintRequestAttributeSet -pras.add(MediaSize.findMedia(40, 15, Size2DSyntax.MM));

但是效果并不准确，我尝试在那里调整x和y参数值，打印的尺寸仍然在25mm x 10mm以内。

任何打印所需尺寸条形码的输入都将受到高度赞赏。我在下面给出了完整的代码详细信息。

(PS:我正在使用“Honeywell PC42t Plus”热敏打印机进行打印，目前我的标签尺寸为700mm x 280mm，我正在等待收到40mm x 15mm尺寸的实际标签。所以这是为了测试，一旦收到实际标签，我可以利用整个标签空间打印实际的 40mm x 15mm 条形码)

public class One_TestMyBarcode {

    private static final String MIME_TYPE = "image/x-png";
    private static final String DELIMTER = "-";
    static String image_name = "NewBarcode_One.png";

    public static void main(String[] args) {

        FileInputStream textStream = null;
        int lastSeqNo = 001;
        String roCode= "ERO";

        AtomicInteger seqNo = new AtomicInteger(lastSeqNo);
        Code128Bean code128 = new Code128Bean();
        code128.setHeight(15f);
        //code128.setBarHeight(40f);
        //code128.setModuleWidth(0.3);
        code128.setModuleWidth(0.2);
        code128.setQuietZone(10);
        code128.doQuietZone(true);

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        BitmapCanvasProvider canvas = new BitmapCanvasProvider(baos, MIME_TYPE, 300, BufferedImage.TYPE_BYTE_BINARY,
                false, 0);

        StringBuffer codeData = new StringBuffer();
        codeData.append(roCode);
        codeData.append(DELIMTER);

        int currentSeqNo = seqNo.getAndIncrement();
        String seq = String.format("%07d", currentSeqNo);
        codeData.append(seq);
        codeData.append(DELIMTER);
        Calendar current = Calendar.getInstance();
        String year = Integer.toString(current.get(Calendar.YEAR)).substring(2);
        codeData.append(year);

        //logger.debug("barcode dimension is ");
        code128.calcDimensions(codeData.toString());
        code128.generateBarcode(canvas, codeData.toString());

        try {
            canvas.finish();
        } catch (IOException e) {
            throw new RuntimeException(e);

        }

        FileOutputStream fos = null;
        try {
            //fos = new FileOutputStream("C:\\Users\\Vinayak\\Desktop\\barcode\\" +image_name);
            fos = new FileOutputStream(image_name);
            fos.write(baos.toByteArray());
            fos.flush();
            fos.close();
            //textStream = new FileInputStream("C:\\Users\\Vinayak\\Desktop\\barcode\\" +image_name);
            textStream = new FileInputStream(image_name);
        } catch (FileNotFoundException e1) {
            e1.printStackTrace();
        } catch (IOException e1) {
            e1.printStackTrace();
        }

        DocFlavor flavor = DocFlavor.INPUT_STREAM.PNG;

        // Position the default print service
        PrintService printService = PrintServiceLookup.lookupDefaultPrintService();

        // Create a print job
        DocPrintJob job = printService.createPrintJob();

        // Set the print properties
        PrintRequestAttributeSet pras = new HashPrintRequestAttributeSet();

        //printed a very small size (20mm x 10mm) and does not scan
        pras.add(MediaSize.findMedia(40, 15, Size2DSyntax.MM));


        //DOESN'T Scan Either
        //pras.add(OrientationRequested.LANDSCAPE);
        //pras.add(OrientationRequested.PORTRAIT);
        //pras.add(MediaSizeName.ISO_A10);  

        //Doesn't print at all
        //pras.add(new MediaPrintableArea(0, 0, 40, 15, MediaPrintableArea.MM));


        pras.add(new Copies(1));
        DocAttributeSet das = new HashDocAttributeSet();

        // Specify print content
        Doc doc = new SimpleDoc(textStream, flavor, das);

        // Do not display the print dialog, print directly
        try {
               System.err.println("Loop - print");
               job.print(doc, pras); // Make specific print operations for each page

        } catch (PrintException pe) {
            pe.printStackTrace();
        }

    }

}

Answer 1

通过使用打印机语言而不是像使用通用打印机一样使用条形码打印机，您可以使程序更短、更快，并确保它始终打印清晰条形码。

import javax.print.*;

public class PrintUsingZPL {
  public static void main(String[] args) {
    StringBuilder codeData = new StringBuilder();
    codeData.append("Stackoverflow"); // example

    String printCommand = "^XA^LH0,0^FO50,50^BCN,100,Y,N,N^FD"+
                          codeData.toString()+
                          "^FS^XZ";
    PrintService printService = PrintServiceLookup.lookupDefaultPrintService();
    try {
      DocPrintJob job = printService.createPrintJob();
      Doc doc = new SimpleDoc(printCommand.getBytes(), DocFlavor.BYTE_ARRAY.AUTOSENSE, null);
      job.print(doc, null);
    }
    catch(PrintException e) { /* error handling goes here */ }
  }
}