Hello friends, today I am going to tell you How to merge more than one PDF files using Java. Using this java code you can merge more than one PDF files to a new PDF file.
Merge2PDF.java:
/*
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*/
package com.techzoop.mergepdf;
/**
*
* @author ARPAN
*/
import java.util.List;
import java.util.Iterator;
import java.util.ArrayList;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import com.lowagie.text.Document;
import com.lowagie.text.pdf.BaseFont;
import com.lowagie.text.pdf.PdfReader;
import com.lowagie.text.pdf.PdfWriter;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfImportedPage;
public class Merge2PDF {
public static void main(String[] arg) {
try {
List<InputStream> pdfList = new ArrayList<InputStream>();
// Path of the 1st pdf that you want to merge
pdfList.add(new FileInputStream("C:\\Users\\USER\\Desktop\\11\\1.pdf"));
// Path of the 2nd pdf that you want to merge
pdfList.add(new FileInputStream("C:\\Users\\USER\\Desktop\\11\\2.pdf"));
// Output file path
OutputStream output = new FileOutputStream("C:\\Users\\USER\\Desktop\\11\\New_Merged.pdf");
// This is the boolean flag that represents whether you need to include page number or not
Merge2PDF.mergepdfList(pdfList, output, true);
} catch (Exception ex) {
System.err.println("Exception occurs : " + ex.getMessage());
}
}
public static void mergepdfList(List<InputStream> streamOfPDFFiles,
OutputStream outputStream, boolean paginate) {
// Creating new object of Document
Document document = new Document();
try {
List<InputStream> pdfList = streamOfPDFFiles;
List<PdfReader> readers = new ArrayList<PdfReader>();
int totalPages = 0;
Iterator<InputStream> iteratorpdfList = pdfList.iterator();
// Create Readers for the pdfList.
while (iteratorpdfList.hasNext()) {
InputStream pdf = iteratorpdfList.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 bsfont = BaseFont.createFont(BaseFont.HELVETICA,
BaseFont.CP1252, BaseFont.NOT_EMBEDDED);
// Holds the PDF data
PdfContentByte cb = writer.getDirectContent();
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(bsfont, 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) {
System.err.println("Exception : " + e.getMessage());
} finally {
if (document.isOpen()) {
document.close();
}
try {
if (outputStream != null) {
outputStream.close();
}
} catch (IOException ioe) {
System.err.println("Exception : " + ioe.getMessage());
}
}
}
}
Library required:
For running this code properly the following library file is required. Click the bellow library file name to download the library.
itext-2.1.4.jar
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