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I have to merge two pdf Files using PdfBox of Apache. I have taken physical pdf files to do so. Below is the code:

PDFMergerUtility ut = new PDFMergerUtility();
ut.addSource(path1);
ut.addSource(path2);
ut.setDestinationFileName(path3);
ut.mergeDocuments(MemoryUsageSetting.setupMainMemoryOnly());

Files are merged perfectly but then have some constraints as below:

  1. I am creating 1st file in the code itself,so it is PDDocument object.
  2. The file which I have to merge with 1st file is in byte array format.
  3. I don't need to save the merged files but need convert it as byte array.

Please anyone help me achieve this requirement.

seenukarthi
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Raushan
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2 Answers2

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Call PDFMergerUtility.appendDocument(PDDocument destination, PDDocument source) instead of merge. To load from a byte array, call PDDocument.load(array).

Btw: I'd discourage to merge PDDocument objects that you created yourself, this fails if you have font subsets (see issue PDFBOX-3243). Better save them (e.g. in a ByteArrayOutputStream) and reload and then merge. To get a byte array from a ByteArrayOutputStream, use ByteArrayOutputStream.tobytearray().

Tilman Hausherr
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  • do you have an example for the `ByteArrayOutputStream` approach? I tried to save two docs into two streams, combined the arrays and reloaded the combined bytes into a new document. However, it didn't seem to work. – Trinimon Apr 07 '17 at 08:18
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    `ByteArrayOutputStream baos = new ByteArrayOutputStream(); doc.save(baos); doc.close(); doc = PDDocument.load(baos.toByteArray());` – Tilman Hausherr Apr 07 '17 at 08:21
  • So you meant one should save and reload the self-made `PDDocument`? ... and your comment was not about merging documents by combining `ByteArrayOutputStream`'s. Right? – Trinimon Apr 07 '17 at 09:15
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    Yes, you should save and reload the self-made PDDocument before merging. – Tilman Hausherr Apr 07 '17 at 09:16
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yes, you can convert it into byte array

PDDocument.load(path3.getBytes()));
chandni s
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