javascript - 使用 iText 打印条码问题

Question

我正在使用 iText 动态生成 PDF 文档。我能够生成 pdf，但我能够以下面提到的格式打印条形码

但需要按下面提到的格式打印条形码

条形码生成和PDF的代码返回是:

    public  void generateShipmentItemPDF(ShipmentItemBarcodeVO objShipmentItem) {
        Document document = new Document();

        FacesContext fc = FacesContext.getCurrentInstance();
        ExternalContext ec = fc.getExternalContext();
        ec.responseReset(); // Some JSF component library or some Filter might have set some headers in the buffer beforehand. We want to get rid of them, else it may collide.

        SimpleDateFormat sdf = new SimpleDateFormat("MM-dd-yyyy");
        PdfWriter docWriter = null;
        String fileName =
            "ShipmentItem_PO# " + objShipmentItem.getPoNumber() + "-" + "Line# " + objShipmentItem.getPoNumber() + "-" + "Item# " + objShipmentItem.getItemNumber().trim() + ".pdf";
        LOGGER.info("fileName-: " + fileName);
        ec.setResponseHeader("Content-Disposition",
                             "attachment; filename=\"" + fileName +
                             "\""); // The Save As popup magic is done here. You can give it any file name you want, this only won't work in MSIE, it will use current request URL as file name instead.
        try{

            docWriter = PdfWriter.getInstance(document,  new FileOutputStream("D:\\" + fileName));
            document.open();
//            document.add(new Paragraph("A Hello World PDF document."));
//            document.newPage();
//            document.add(new Paragraph("A New Page Hello World PDF document."));

            PdfContentByte cb = docWriter.getDirectContent();
            Barcode128 code128 = new Barcode128();
            code128.setBarHeight(5f);
            code128.setX(0.1f);
            code128.setCode(objShipmentItem.getItemNumber());
            code128.setCodeType(Barcode128.CODE128);
            Image code128Image = code128.createImageWithBarcode(cb, null, null);
//            code128Image.setAbsolutePosition(10,500);
//            code128Image.scalePercent(50);


            PdfPTable table = new PdfPTable(2); 
            table.setWidthPercentage(100);
//            table.setSpacingBefore(100f);
//            table.setSpacingAfter(100f);



            // first row Print 
            String newline = System.getProperty("line.separator");
            String texting = objShipmentItem.getSupplierName() + newline +  objShipmentItem.getSupplierAddress().toString().trim() ;

            PdfPCell cell = new PdfPCell(new Phrase(texting));
            cell.setFixedHeight(40f);
            cell.setColspan(10);
            cell.setHorizontalAlignment(Element.ALIGN_CENTER);
            cell.setPadding(5.0f);
            table.addCell(cell);
//            table.addCell(code128Image);


            cell = new PdfPCell(new Phrase("Item Description: " + objShipmentItem.getItemDescription()));
            cell.setPadding(5.0f);
            cell.setFixedHeight(40f);
            table.addCell(cell);

            cell = new PdfPCell(new Phrase("Quantity : " + objShipmentItem.getQuantity()));
            cell.setPadding(5.0f);
            cell.setFixedHeight(40f);
            table.addCell(cell);

            cell = new PdfPCell(new Phrase("Country Of Origin : " + objShipmentItem.getCountryOfOrigin()));
            cell.setPadding(5.0f);
            cell.setFixedHeight(40f);
            table.addCell(cell);

            cell = new PdfPCell(new Phrase("PO #: " + objShipmentItem.getPoNumber()));
            cell.setPadding(5.0f);
            cell.setFixedHeight(40f);
            table.addCell(cell);



            cell = new PdfPCell(new Phrase("PO Line #: " + objShipmentItem.getPoLine()));
            cell.setPadding(5.0f);
            cell.setFixedHeight(40f);
            table.addCell(cell);

//            String itemtext = "Item #: " + objShipmentItem.getItemNumber() + newline + code128Image  ;
//            document.add(new Paragraph("Item #: "));
//            cell = new PdfPCell(new Phrase(itemtext));
            cell.setPadding(5.0f);
            cell.setFixedHeight(40f);
            table.addCell(code128Image);

            cell = new PdfPCell(new Phrase("Lot Serial #: "));
            cell.setPadding(5.0f);
            cell.setFixedHeight(40f);
            table.addCell(cell);

            cell = new PdfPCell(new Phrase("Lot Expiration Date: " + sdf.format(objShipmentItem.getLotExpDate())));
            cell.setPadding(5.0f);
            cell.setFixedHeight(40f);
            table.addCell(cell);


            cell = new PdfPCell(new Phrase("Shipment #: "+ objShipmentItem.getShipmentNumber()));
            cell.setPadding(5.0f);
            cell.setFixedHeight(40f);
            table.addCell(cell );
            table.addCell(" ");






            document.add(table);
            document.close(); // no need to close PDFwriter?
        }catch (DocumentException e) {
            e.printStackTrace();
        }catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        catch(Exception E){
            E.printStackTrace();
        }

    }

谁能帮我以正确的格式显示条形码

Answer 1

请查看 BarcodeInTable例子。在此示例中，我们以两种不同的方式添加条形码:

在第一种方法中，我们使用带有负值的 setBaseLine() 方法来确保代码添加在条形码上方而不是下方:

Barcode128 code128 = new Barcode128();
code128.setBaseline(-1);
code128.setSize(12);
code128.setCode(code);
code128.setCodeType(Barcode128.CODE128);
Image code128Image = code128.createImageWithBarcode(cb, null, null);
PdfPCell cell = new PdfPCell(code128Image);
table.addCell(cell);

请注意，我删除了 setX() 方法，并定义了不同的字体大小以使条形码看起来正确。我看到您还定义了条形高度，但是添加条形码的方式会缩放以匹配单元格，因此您可能需要使用不同的策略来创建条形码单元格。

这种方法有一些缺点。第一个缺点是您必须调整一些大小参数才能获得良好的结果(也许还可以使用 setTextAlignment() 来更改默认对齐方式)。第二个缺点是您可能希望对要添加的文本有更多的自由。例如:您可能需要像示例中那样添加 PO #:。

这就是为什么我还提供了第二种添加文本和条形码的方法:

code128 = new Barcode128();
code128.setFont(null);
code128.setCode(code);
code128.setCodeType(Barcode128.CODE128);
code128Image = code128.createImageWithBarcode(cb, null, null);
cell = new PdfPCell();
cell.addElement(new Phrase("PO #: " + code));
cell.addElement(code128Image);
table.addCell(cell);

在本例中，我们将字体设置为 null，以便不生成任何文本。我们将文本与条形码一起添加到单元格中。现在我们有更多的自由来完全按照我们想要的方式设置文本格式。

code128Image 会缩放以适合单元格的宽度，但您可以通过设置图像的宽度百分比来更改此设置，也可以更改列的宽度。