Merge Pdf Files Using PDFBox

问题:

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.

回答1:

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().