[英]Editing existing hyperlinks in pdf with itext 4
我们需要更改 pdf 中的超链接。 有许多以 p- 开头的超链接,我们需要删除 p-。
到目前为止,我们能够阅读超链接。 任何人都知道如何编辑它们并保存pdf?
谢谢
public static void main(final String[] args) {
final List<byte[]> pdfs = new ArrayList<>();
final List<String> testfiles = Arrays.asList("72076.5.1.pdf");
final String dir = "C:\\Entwicklung\\testaround\\pdf\\";
for (final String name : testfiles) {
final File file = new File(dir + name);
final Path path = Paths.get(file.toURI());
try (InputStream istream = new FileInputStream(path.toFile())) {
final byte[] data = ByteStreams.toByteArray(istream);
pdfs.add(data);
final PdfReader reader = new PdfReader(data);
final PdfDictionary pageDictionary = reader.getPageN(36);
final PdfArray annotations = pageDictionary.getAsArray(PdfName.ANNOTS);
if (annotations != null && annotations.size() != 0) {
for (int i = 0; annotations.size() > i; i++) {
final PdfObject annot = annotations.getDirectObject(i);
final PdfDictionary annotationDictionary = (PdfDictionary)PdfReader.getPdfObject(annot);
if (annotationDictionary.get(PdfName.SUBTYPE).equals(PdfName.LINK)) {
final PdfDictionary annotationAction = annotationDictionary.getAsDict(PdfName.A);
if (annotationAction.get(PdfName.S).equals(PdfName.URI)) {
final PdfString destination = annotationAction.getAsString(PdfName.URI);
final String url = destination.toString();
System.out.println(url);
}
}
}
}
final int n = reader.getNumberOfPages();
System.out.println("Pages : " + n);
Files.write(Paths.get(dir + "new.pdf"), data);
} catch (final FileNotFoundException e) {
e.printStackTrace();
} catch (final IOException e) {
e.printStackTrace();
}
}
}
首先,您必须将新值设置为annotationAction
字典中的URI键:
if (annotationAction.get(PdfName.S).equals(PdfName.URI)) {
final PdfString destination = annotationAction.getAsString(PdfName.URI);
final String url = destination.toString();
System.out.println(url);
String updatedUrl = [... url changed to match the changed criteria ...];
annotationAction.put(PdfName.URI, new PdfString(updatedUrl));
}
之后,您必须通过应用PdfStamper
来保存更改,而无需进一步操作:
final byte[] data = ByteStreams.toByteArray(istream);
pdfs.add(data);
final PdfReader reader = new PdfReader(data);
final PdfDictionary pageDictionary = reader.getPageN(36);
final PdfArray annotations = pageDictionary.getAsArray(PdfName.ANNOTS);
if (annotations != null && annotations.size() != 0) {
[...]
}
new PdfStamper(reader, new FileOutputStream(dir + name + "-new.pdf")).close();
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