Concatinating 2 PDF's

In my previous post you have seen how to generate jasper reports
In this post i will tell you how to concatenate two pdf's as one pdf

1.create a class PDFConcatenate
2. place 2 pdfs in a specific path and give that path below

class PdfConcatenat {
	static void main(args){
		List list = new ArrayList();
		try {
			// Source pdfs
			list.add(new FileInputStream(new File("D:/1.pdf")));
			list.add(new FileInputStream(new File("D:/2.pdf")));

			// Resulting pdf
			OutputStream out = new FileOutputStream(new File("D:/result.pdf"));

			doMerge(list, out);
			Process p = Runtime
			.getRuntime()
			.exec("rundll32 url.dll,FileProtocolHandler D:/result.pdf");
		 p.waitFor();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (DocumentException e) {
		
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
			
	}

	public static void doMerge(List list, OutputStream outputStream)throws DocumentException, IOException {
		Document document = new Document();
		PdfWriter writer = PdfWriter.getInstance(document, outputStream);
		document.open();
		PdfContentByte cb = writer.getDirectContent();
		for (InputStream ins : list) {
			PdfReader reader = new PdfReader(ins);
			for (int i = 1; i <= reader.getNumberOfPages(); i++) {
				document.newPage();
				//import the page from source pdf
				PdfImportedPage page = writer.getImportedPage(reader, i);
				//add the page to the destination pdf
				cb.addTemplate(page, 0, 0);
			}
		}
		outputStream.flush();
		document.close();
		outputStream.close();
	}
}