package er.pdf;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import com.lowagie.text.Document;
import com.lowagie.text.pdf.BaseFont;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfImportedPage;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfWriter;
/**
* Based upon http://java-x.blogspot.com/2006/11/merge-pdf-files-with-itext.html
* ERPDFMerge contains the method concatPDFs to concatenate multiple PDF documents
* into one.
*
* @author mhast
*/
public class ERPDFMerge {
/**<p>
* Concatenates the list of streamOfPDFFiles into one PDF document that can
* be accessed via outputStream. If paginate is true it adds page numbering
* to the bottom right of each PDF page.</p>
* <p>
* This method creates a default iText Document object and passes it into concatPDFs(List, OutputStream, Document, boolean) method
* </p>
*
* @param streamOfPDFFiles
* @param outputStream
* @param paginate
*/
public static void concatPDFs(List<InputStream> streamOfPDFFiles, OutputStream outputStream, boolean paginate) {
ERPDFMerge.concatPDFs(streamOfPDFFiles, outputStream, new Document(), paginate);
}
/**
* <p>
* Concatenates a list of streamOfPDFFiles into one PDF document that can be
* accessed through the outputStream.
* </p>
* <p>
* The document arg is intended to give you control over the page size and
* margins by allowing you to construct a document of your own parameters.
* Other than that, it behaves the same as the concatPDFs method without the
* document arg
* </p>
* <p>To use this version of the method, create a new Document and pass it in like this:
*
* <pre>
com.lowagie.text.Document doc = new com.lowagie.text.Document(com.lowagie.text.PageSize.LETTER, 0.0F, 0.0F,0.0F,0.0F);
ERPDFMerge.concatPDFs(pdfsToCombine, output, doc, true);</pre>
* That creates a letter sized (8.5 in x 11 in) page with no margin (suitable for concatinating 8.5x11 pdfs that already have
* their margins set.
*
*
* @param streamOfPDFFiles
* @param outputStream
* @param document
* @param paginate
*
* @see com.lowagie.text.Document iText Document class
* @see com.lowagie.text.PageSize Page Size class in iText
*
* @author Larry Mills-Gahl <lmg@webfarm.com>
*/
public static void concatPDFs(List<InputStream> streamOfPDFFiles, OutputStream outputStream, Document document, boolean paginate) {
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) {
e.printStackTrace();
} finally {
if (document.isOpen()) document.close();
try {
if (outputStream != null) outputStream.close();
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
}
}