CODEWITHSUNDEEP
javapdfitextpdf-generationitext7
Nexussim Lements
Nexussim Lements

Reputation: 797

How to merge List<PdfDocument> into a single PdfDocument

I have a List with multiple PDFs , and I want to merge all of them into a single PdfDocument (im using iText) , and then transform this PdfDocument into a ByteArrayOutputStream (OR a byte[]).

public byte[] mergePdfDocumentsIntoAPdfDocument (List<PdfDocument> pdfDocuments){

 final ByteArrayOutputStream mergedPdfStream = new ByteArrayOutputStream();
    final PdfDocument mergedPdfDocument = new PdfDocument(new PdfWriter(mergedPdfStream));


//I dont know how can I continue this

What should I do in order to achieve this?

Upvotes: 1

Views: 207

Answers (1)

devgianlu
devgianlu

Reputation: 1580

public byte[] mergePdfDocumentsIntoAPdfDocument(List<PdfDocument> pdfDocuments){
    ByteArrayOutputStream mergedPdfStream = new ByteArrayOutputStream();
    PdfDocument resultDoc = new PdfDocument(new PdfWriter(mergedPdfStream));

    for (PdfDocument doc : pdfDocuments) {
        int n = doc.getNumberOfPages();
        for (int i = 1; i <= n; i++) {
            PdfPage page = doc.getPage(i).copyTo(resultDoc);
            resultDoc.addPage(page);
        }
    }

    resultDoc.close();
    return mergedPdfStream.toByteArray();
}

Upvotes: 3

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