It works for me... here's my code:
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import javax.xml.transform.TransformerException;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.common.PDMetadata;
import org.apache.xmpbox.XMPMetadata;
import org.apache.xmpbox.schema.DublinCoreSchema;
import org.apache.xmpbox.xml.XmpSerializer;
public class ChangeMeta
{
public static void main(String[] args) throws IOException,
TransformerException
{
PDDocument doc = PDDocument.load(new File("testing.pdf"));
XMPMetadata xmp = XMPMetadata.createXMPMetadata();
DublinCoreSchema dc = xmp.createAndAddDublinCoreSchema();
dc.setDescription("descr");
XmpSerializer serializer = new XmpSerializer();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
serializer.serialize(xmp, baos, true);
PDMetadata metadata = new PDMetadata(doc);
metadata.importXMPMetadata(baos.toByteArray());
doc.getDocumentCatalog().setMetadata(metadata);
doc.save(new File("testing-new.pdf"));
}
}
And the proof that it worked:
Tilman
Am 20.07.2018 um 21:15 schrieb Matthew Clemente:
Forgive me if this question has an obvious answer; perhaps I’m not taking
the right approach to the problem.
My goal is to save a version of a pdf, with modified metadata. In most
cases, I’ll be removing metadata (setting the author, title, description to
blank), though in some cases I’ll be adding information to those fields.
I’ve tried both approaches from these StackOverflow answers:
https://stackoverflow.com/questions/40295264/how-to-add-metadata-to-pdf-document-using-pdfbox
That is, I’ve tried creating the metadata via XMPMetadata and using
importXMPMetadata(). I’ve also tried using the Document Information object
(inputDoc.getDocumentInformation().setCreator("Some meta”);).
In both cases, if the field is empty in the original document I’ve loaded,
the new value is set without issue. However, if the metadata field already
contains a value, the new value is not applied.
Is there a way for me to overwrite metadata, or am I approaching this all
wrong?
Here’s a pdf I was using while testing (it has a title and author set, but
no subject): https://www.dropbox.com/s/olk2zhnh47ohtpk/testing.pdf?dl=0
Thanks, in advance, for any insight.
