我来找你是因为我有一个问题！我使用 Adobe Acrobat 在 acroform PDF 中创建了条码。我可以将新值设置为 barCode 字段，但我无法使用新值生成新的“外观”。我怎样才能做到这一点 ？这就是我现在做的没有成功......：PdfFormField field = fields.get("QRCODE");field.setValue(this.generateXMLDataMatrix(),false);form = form.setNeedAppearances(true);form.flattenFields();pdf.close(); 所以现在，我仍然拥有在 Adobe Acrobat 中创建的默认外观 :(谢谢你的帮助 ！:)
2 回答
慕桂英3389331
TA贡献2036条经验 获得超8个赞
您将必须手动生成字段外观。这是一个如何为 QR 码执行此操作的示例：
PdfFormField field = fields.get("QRCODE");
// Get the annotation. If you might have multiple representations of the same field across the document the just iterate over all widgets
PdfWidgetAnnotation annotation = field.getWidgets().get(0);
// This class will help us draw the barcode
BarcodeQRCode qrCode = new BarcodeQRCode(this.generateXMLDataMatrix());
// Get the number of rectangles constituting the barcode
Rectangle size = qrCode.getBarcodeSize();
// Creating a new FormXObject that will become our apperance. Set the dimension(bbox) of the current appearance
PdfFormXObject newAppearance = new PdfFormXObject(annotation.getAppearanceObject(PdfName.N).getAsRectangle(PdfName.BBox));
// Helper class to draw on FormXObject
PdfCanvas barcodeCanvas = new PdfCanvas(newAppearance, pdfDocument);
// Calculating the side of the smaller rectangle in the barcode
float side = Math.min(annotation.getRectangle().toRectangle().getHeight() / size.getHeight(),
annotation.getRectangle().toRectangle().getWidth() / size.getWidth());
// Draw the barcode on the XObject
qrCode.placeBarcode(barcodeCanvas, ColorConstants.BLACK, side);
// Set appearance to the newly generated one
annotation.setAppearance(PdfName.N, newAppearance.getPdfObject());
12345678_0001
TA贡献1802条经验 获得超5个赞
解决了！这就是我最终做到的：
//Generate BarCodedataMatrix
BarcodeDataMatrix dataMatrix = new BarcodeDataMatrix();
//Add code to the BarCodedataMatrix
dataMatrix.setCode(generateXMLDataMatrix());
dataMatrix.setOptions(BarcodeDataMatrix.DM_AUTO);
//Add dataMatrix to PDF
//Create a canvas for the first page
PdfCanvas canvas = new PdfCanvas(pdf.getFirstPage());
//Create the PdfFormXObject based on the dataMatrix
PdfFormXObject object = dataMatrix.createFormXObject(pdf);
//Add the pdfFormXObject to the canvas at X,Y position
canvas.addXObject(object,50,660);
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