Merge two PDF into one and Split one PDf into two PDF using java

In order to use this code you need open source lib iText.jar.you can download using link mentioned in my one of blog post "Generate PDf using java".

ConcatPDFs function helps you to merger two pdf say anuj1.pdf and anuj2.pdf into anujmerge.

Using function split pdf,you can split existing one pdf( say having 2 pages) into two seperate pdf say,output1.pdf(page 1 to 1) and output2.pdf(page 2 to 2).


package com.anuj.pdf;

import java.io.FileInputStream;
import java.io.FileOutputStream;
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;

public class MergePDF {

    public static void main(String[] args) {
        try {
            List pdfs = new ArrayList();
            pdfs.add(new FileInputStream("c:\\Anuj1.pdf"));
            pdfs.add(new FileInputStream("c:\\Anuj2.pdf"));
            OutputStream output = new FileOutputStream("c:\\Anujmerge.pdf");
            MergePDF.concatPDFs(pdfs, output, true);

            // split an input.pdf
            try {
                MergePDF.splitPDF(new FileInputStream("C:\\Anujmerge.pdf"),
                        new FileOutputStream("C:\\output1.pdf"), 1, 1);
                MergePDF.splitPDF(new FileInputStream("C:\\Anujmerge.pdf"),
                        new FileOutputStream("C:\\output2.pdf"), 2, 2);

            } catch (Exception e) {
                e.printStackTrace();
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void concatPDFs(List streamOfPDFFiles,
            OutputStream outputStream, boolean paginate) {

        Document document = new Document();
        try {
            List pdfs = streamOfPDFFiles;
            List readers = new ArrayList();
            int totalPages = 0;
            Iterator 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 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();
            }
        }
    }

    public static void splitPDF(InputStream inputStream,
            OutputStream outputStream, int fromPage, int toPage) {
        Document document = new Document();
        try {
            PdfReader inputPDF = new PdfReader(inputStream);

            int totalPages = inputPDF.getNumberOfPages();

            // make fromPage equals to toPage if it is greater
            if (fromPage > toPage) {
                fromPage = toPage;
            }
            if (toPage > totalPages) {
                toPage = totalPages;
            }

            // Create a writer for the outputstream
            PdfWriter writer = PdfWriter.getInstance(document, outputStream);

            document.open();
            PdfContentByte cb = writer.getDirectContent(); // Holds the PDF data
            PdfImportedPage page;

            while (fromPage <= toPage) {
                document.newPage();
                page = writer.getImportedPage(inputPDF, fromPage);
                cb.addTemplate(page, 0, 0);
                fromPage++;
            }
            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();
            }
        }
    }
}
Please note that example mentioned here is only for learning purpose and You should refer to following before using :

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