用Java合并2个PDF

Question

I have a Problem with iText and merging of 2PDFs to 1 PDF.

I would like to merge this PDFs:

PDF1 - One Site:

This is PDF1.

PDF2 - One Site:

This is PDF2.

What I need: https://dl.dropboxusercontent.com/u/4001370/whatIneed.pdf

Code 1 - Two Sites:

One Site One: This is PDF1.
One Site Two: This is PDF2.

    PDFMergerUtility ut = new PDFMergerUtility();
    ut.addSource("C:\\Temp\\PDF1.pdf");
    ut.addSource("C:\\Temp\\PDF2.pdf");
    ut.setDestinationFileName("C:\\Temp\\Code1.pdf");
    ut.mergeDocuments();

Code 2 - The number is overwritten:

This is PDF(1/2).

public class main {
public static void main(String[] args) throws IOException, DocumentException {
    PdfReader reader;
    PdfImportedPage page;


    LinkedList<File> fileList = new LinkedList<File>();
    fileList.add(new File("C:\\Temp\\PDF1.pdf"));
    fileList.add(new File("C:\\Temp\\PDF2.pdf"));


    File ergebnis = new File("C:\\Temp\\Code2.pdf");
    Document document2 = new Document(PageSize.A4);
    PdfWriter writer = PdfWriter.getInstance(document2, new FileOutputStream(ergebnis));

    document2.open();
    PdfContentByte canvas = writer.getDirectContent();

    // Header 
    reader = new PdfReader(fileList.get(0).getAbsolutePath());
    page = writer.getImportedPage(reader, 1);
    canvas.addTemplate(page, 0, 0);
    // Aufgabe
    reader = new PdfReader(fileList.get(1).getAbsolutePath());
    for(int i=1; i<=reader.getNumberOfPages(); i++){
        page = writer.getImportedPage(reader, i);
        canvas.addTemplate(page, 0, 0);
        document2.newPage();
    }

    document2.close();
    writer.close();
}

}

I have no Idea. I hope you can help me at this problem.

Answer 1

Please read Chapter 6 of my book. It explains why using PdfWriter / PdfImportedPage is the wrong way to merge documents. You should use PdfCopy or PdfSmartCopy if you want to concatenate two documents. You should use PdfStamper if you want one document to act as company stationery for the other document. From your question, it's not clear which one of both you need (you leave that open to interpretation), so please read chapter 6. I've done the effort of writing it and making available for free so that you can choose the solution that is right for you.

Answer 2

这个问题有点含糊-如果您要问如何获取两个PDF并将它们合并在一起，那么这篇SO文章展示了在iText中最简单的方法： 如何将不同的文档合并为一个文档？