How to merge PDFs and add bookmarks?

I am merging multiple PDFs together into one PDF and I need to build bookmarks for the final PDF.

For example, I have three PDFs: doc1.pdf, doc2.pdf and doc3.pdf, doc1 and doc2 belong to Group1, doc3 belongs to Group2. I need to merge them and have to build nested bookmarks for the resulting PDFs like this:

TEXT

Group1
    doc1
    doc2
Group2
    doc3

Posted on StackOverflow on May 15, 2014 by user3642526

I've made a MergeWithOutlines example that concatenates three existing PDFs in iText 7.

While doing so, I use the PdfOutline class like this:

JAVA

PdfOutline helloWorld = rootOutline.addOutline("Hello World");
helloWorld.addDestination(PdfExplicitDestination.createFit(pdfDoc.getPage(page)));

JAVA

page += srcDoc1.getNumberOfPages();
PdfOutline link1 = helloWorld.addOutline("link1");
link1.addDestination(PdfExplicitDestination.createFit(pdfDoc.getPage(page)));
page += srcDoc1.getNumberOfPages();
PdfOutline link2 = rootOutline.addOutline("Link 2");
link2.addDestination(PdfExplicitDestination.createFit(pdfDoc.getPage(page)));

Where rootOutline is the following:

JAVA

PdfOutline rootOutline = pdfDoc.getOutlines(false);

If you want an entry without a link, remove the line that adds the destination. As you see, it’s much more easier to achieve your goal with iText 7 than iText 5.

Click How to merge PDFs and add bookmarks? if you want to see how to answer this question in iText 5.