使用itext 4编辑pdf中的现有超链接 [英] Editing existing hyperlinks in pdf with itext 4

问题描述

我们需要更改pdf中的超链接.有很多以p-开头的超链接，我们需要删除p-.

We need to change the hyperlinks in a pdf. There are many hyperlinks which start with p- and we need to remove the p-.

到目前为止，我们已经能够阅读超链接. 有人知道如何编辑它们并保存pdf吗?

So far we are able to read the hyperlinks. Anyone knows how to edit them and save the 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();
        }
    }
}

推荐答案

首先，您必须将新值设置为annotationAction词典中的 URI 键:

First of all you have to set the new value to the URI key in the annotationAction dictionary:

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));
}

此后，您必须通过应用PdfStamper来保存更改，而无需采取进一步措施:

After that you have to save the changes by applying a PdfStamper without further actions:

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();

这篇关于使用itext 4编辑pdf中的现有超链接的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！