public void manipulatePdf(String src, String dest, int pow)
throws IOException, DocumentException {
PdfReader reader = new PdfReader(src);
Rectangle pageSize = reader.getPageSize(1);
Rectangle newSize =
(pow % 2) == 0
? new Rectangle(pageSize.getWidth(), pageSize.getHeight())
: new Rectangle(pageSize.getHeight(), pageSize.getWidth());
Rectangle unitSize = new Rectangle(pageSize.getWidth(), pageSize.getHeight());
for (int i = 0; i < pow; i++) {
unitSize = new Rectangle(unitSize.getHeight() / 2, unitSize.getWidth());
}
int n = (int) Math.pow(2, pow);
int r = (int) Math.pow(2, pow / 2);
int c = n / r;
Document document = new Document(newSize, 0, 0, 0, 0);
PdfWriter writer =
PdfWriter.getInstance(document, new FileOutputStream(String.format(dest, n)));
document.open();
PdfContentByte cb = writer.getDirectContent();
PdfImportedPage page;
Rectangle currentSize;
float offsetX, offsetY, factor;
int total = reader.getNumberOfPages();
for (int i = 0; i < total; ) {
if (i % n == 0) {
document.newPage();
}
currentSize = reader.getPageSize(++i);
factor =
Math.min(
unitSize.getWidth() / currentSize.getWidth(),
unitSize.getHeight() / currentSize.getHeight());
offsetX =
unitSize.getWidth() * ((i % n) % c)
+ (unitSize.getWidth() - (currentSize.getWidth() * factor)) / 2f;
offsetY =
newSize.getHeight()
- (unitSize.getHeight() * (((i % n) / c) + 1))
+ (unitSize.getHeight() - (currentSize.getHeight() * factor)) / 2f;
page = writer.getImportedPage(reader, i);
cb.addTemplate(page, factor, 0, 0, factor, offsetX, offsetY);
}
document.close();
}
public static void concatPDFs(
List<InputStream> streamOfPDFFiles,
InputStream fs,
OutputStream outputStream,
boolean paginate)
throws IOException {
Document document = new Document(new PdfReader(fs).getPageSize(1));
try {
List<InputStream> pdfs = streamOfPDFFiles;
List<PdfReader> readers = new ArrayList<PdfReader>();
int totalPages = 0;
Iterator<InputStream> iteratorPDFs = pdfs.iterator();
// Create Readers for the pdfs.
while (iteratorPDFs.hasNext()) {
InputStream pdf = iteratorPDFs.next();
PdfReader pdfReader = new PdfReader(pdf);
readers.add(pdfReader);
totalPages += pdfReader.getNumberOfPages();
}
// Create a writer for the outputstream
PdfWriter writer = PdfWriter.getInstance(document, outputStream);
document.open();
BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA, BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
PdfContentByte cb = writer.getDirectContent(); // Holds the PDF
// data
PdfImportedPage page;
int currentPageNumber = 0;
int pageOfCurrentReaderPDF = 0;
Iterator<PdfReader> iteratorPDFReader = readers.iterator();
// Loop through the PDF files and add to the output.
while (iteratorPDFReader.hasNext()) {
PdfReader pdfReader = iteratorPDFReader.next();
// Create a new page in the target for each source page.
while (pageOfCurrentReaderPDF < pdfReader.getNumberOfPages()) {
document.newPage();
pageOfCurrentReaderPDF++;
currentPageNumber++;
page = writer.getImportedPage(pdfReader, pageOfCurrentReaderPDF);
cb.addTemplate(page, 0, 0);
// Code for pagination.
if (paginate) {
cb.beginText();
cb.setFontAndSize(bf, 9);
cb.showTextAligned(
PdfContentByte.ALIGN_CENTER,
"" + currentPageNumber + " of " + totalPages,
520,
5,
0);
cb.endText();
}
}
pageOfCurrentReaderPDF = 0;
}
outputStream.flush();
document.close();
outputStream.close();
} catch (Exception e) {
log.error(e.getLocalizedMessage(), e);
} finally {
if (document.isOpen()) document.close();
try {
if (outputStream != null) outputStream.close();
} catch (IOException ioe) {
log.error(ioe.getLocalizedMessage(), ioe);
}
}
}
