我试图使用Itext 5从扫描的PDF中编辑数据，但不知怎的，它对我来说不起作用。我只能创建编辑但不能应用它。我尝试了他们给出的例子，但它只适用于创建编辑
String fileName = "scanned.pdf";
String dest = "output_scannedPdf.pdf";
PdfReader reader = new PdfReader(SRC + fileName);
int page = 1;
Rectangle rect = new Rectangle(500, 50, 200, 300);
PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(DEST + dest));
PdfAnnotation annotation = new PdfAnnotation(stamper.getWriter(), rect);
annotation.put(PdfName.SUBTYPE, new PdfName("Redact"));
annotation.setTitle("My author");
annotation.put(new PdfName("Subj"), new PdfName("Redact"));
float[] fillColor = { 0, 0, 0 };
annotation.put(new PdfName("IC"), new PdfArray(fillColor));
float[] fillColorRed = { 1, 0, 0 };
annotation.put(new PdfName("OC"), new PdfArray(fillColorRed));
stamper.addAnnotation(annotation, page);
// manipulatePdf(dest, dest1);
PdfCleanUpProcessor cleaner = new PdfCleanUpProcessor(stamper);
cleaner.cleanUp();
stamper.close();
reader.close();
我在extractLocationsFromRedactAnnots()方法PdfName annotSubtype = annotDict.getAsName(PdfName.SUBTYPE);