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

3

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);

answered Nov 17, 2016 at 9:54

mkl

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Comments

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

0

 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();
    }
   }

answered Nov 17, 2016 at 8:10

mayank agrawal

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2 Comments

user1012506 Over a year ago

Nice, but I don't want use path of the PDF, I have use with convert.

mkl Over a year ago

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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