How to convert PdfCopy to byte array in java

Question

I try to merge 2 PDF files into one PDF. I did it with PdfCopy.addPage(...) now I have good PdfCopy and I want to get it as byte array.

How can I do it? This is my code:

public void mergePDF(ActionEvent actionEvent) throws DocumentException, FileNotFoundException, IOException { String[] files = { "C:\\first.pdf","C:\sescond"}; Document document = new Document(); PdfCopy copy = new PdfCopy(document, new FileOutputStream("C:\\temp\\myMergedFile.pdf")); document.open(); PdfReader reader; int n; for (int i = 0; i < files.length; i++) { reader = new PdfReader(files[i]); n = reader.getNumberOfPages(); for (int page = 0; page < n; ) { copy.addPage(copy.getImportedPage(reader, ++page)); } copy.freeReader(reader); reader.close(); } document.close(); }

Thanks.

soha

You are not saying which library you have used. Please add a tag and or upadet your question with this — jontro
– jontro, Commented Nov 17, 2016 at 8:46

mkl · Accepted Answer · 2016-11-17 09:54:14Z

Instead of using a FileOutputStream in

PdfCopy copy = new PdfCopy(document, new FileOutputStream("C:\\temp\\myMergedFile.pdf"));

simply use a ByteArrayOutputStream:

ByteArrayOutputStream baos = new ByteArrayOutputStream(); PdfCopy copy = new PdfCopy(document, baos);

After closing the document you can retrieve the byte array:

document.close(); byte[] documentBytes = baos.toByteArray();

If you want to have the document both as byte array and as file, simply add

Files.write(new File("PATH_AND_NAME_OF_FILE.pdf").toPath(), documentBytes);

mayank agrawal · Accepted Answer · 2016-11-17 08:10:57Z

 public static void main( String[] args ) { FileInputStream fileInputStream=null; File file = new File("C:\\testing.txt"); byte[] bFile = new byte[(int) file.length()]; try { //convert file into array of bytes fileInputStream = new FileInputStream(file); fileInputStream.read(bFile); fileInputStream.close(); for (int i = 0; i < bFile.length; i++) { System.out.print((char)bFile[i]); } System.out.println("Done"); }catch(Exception e){ e.printStackTrace(); } }

Nice, but I don't want use path of the PDF, I have use with convert.
Unless you are bound to a very old Java version, you might want to make this a one-liner using java.nio.file.Files.readAllBytes(Path).

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