Itext - Add Content to Existing PDF File

iText - add content to existing PDF file

iText has more than one way of doing this. The PdfStamper class is one option. But I find the easiest method is to create a new PDF document then import individual pages from the existing document into the new PDF.

// Create output PDF
Document document = new Document(PageSize.A4);
PdfWriter writer = PdfWriter.getInstance(document, outputStream);
document.open();
PdfContentByte cb = writer.getDirectContent();

// Load existing PDF
PdfReader reader = new PdfReader(templateInputStream);
PdfImportedPage page = writer.getImportedPage(reader, 1); 

// Copy first page of existing PDF into output PDF
document.newPage();
cb.addTemplate(page, 0, 0);

// Add your new data / text here
// for example...
document.add(new Paragraph("my timestamp")); 

document.close();

This will read in a PDF from templateInputStream and write it out to outputStream. These might be file streams or memory streams or whatever suits your application.

How to append a PDF file to an existing one with iText?

I hope this code will help you.

public static void mergePdfs(){
     try {
          String[] files = { "D:\\1.pdf" ,"D:\\2.pdf"  ,"D:\\3.pdf" ,"D:\\4.pdf"};
          Document pDFCombineUsingJava = new Document();
          PdfCopy copy = new PdfCopy(pDFCombineUsingJava , new FileOutputStream("D:\\CombinedFile.pdf"));
          pDFCombineUsingJava.open();
          PdfReader ReadInputPDF;
          int number_of_pages;
          for (int i = 0; i < files.length; i++) {
                  ReadInputPDF = new PdfReader(files[i]);
                  copy.addDocument(ReadInputPDF);
                  copy.freeReader(ReadInputPDF);
          }
          pDFCombineUsingJava.close();
        }
        catch (Exception i)
        {
            System.out.println(i);
        }
}

Add existing PDF document to opened document

Read the answer to this question
Read BLOB (PDF Content) from database and edit and output PDF ,
for more detailed description

Use PdfContentByte to hold the PDF content to be added

 PdfContentByte cb = writer.getDirectContent(); 

Create a PdfImportedPage page object for each page you want to import from another document using getImportedPage() and add the page using to writer using addTemplate():

trunk.newPage();
page = writer.getImportedPage(pdfReader, pagenumber);
cb.addTemplate(page, 0, 0);

Make sure to close the document and the pdfReader.

Note: do not use this code snippet if you merely want to merge a bunch of files. The reason why you shouldn't do this, is explained in the answer to the question How to merge documents correctly?

itext7 - adding content from existing PDF to a new one

To stamp your template page origPage onto the current first page of pdf instead of a new one, simply replace

PdfPage page = pdf.addNewPage(1, PageSize.A4);

by

PdfPage page = pdf.getPage(1);

Now page references the already existing first page instead of a new one, and your further manipulations add the template page thereupon.

Create a link in Existing PDF Using iText 5.5.13.2

I am referring to this answer. Have a look. Modifying existing pdf file using iText 5.5.13.2 is complicated. But the referred solution is more easier.
iText 7 has handier way to modify existing pdf.
There are several other ways. Like PdfStamper etc.

From referred answer, add following code to make an anchor.

Phrase phrase = new Phrase("Open ");
Phrase phrase1 = new Phrase(" on Click On it.");

Font anchorFont = new Font(Font.FontFamily.UNDEFINED, 11);
anchorFont.setColor(BaseColor.BLUE);
anchorFont.setStyle(Font.FontStyle.UNDERLINE.getValue());

Anchor anchor = new Anchor("Google", anchorFont);
anchor.setReference("www.google.com");

phrase.add(anchor);
phrase.add(phrase1);
document.add(phrase);

Change the font and colors based on your needs.

Full code:

try {
    PdfReader reader = new PdfReader("test.pdf"); //src pdf path (the pdf I need to modify)

    Document document = new Document();
    PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream("test2.pdf")); // destination pdf path
    document.open();

    PdfContentByte cb = writer.getDirectContent();
    PdfImportedPage page = writer.getImportedPage(reader, 1);

    document.newPage();
    document.setPageSize(reader.getPageSize(1));

    cb.addTemplate(page, 0, 0);

    Phrase phrase = new Phrase("Open ");
    Phrase phrase1 = new Phrase(" on Click On it.");
    Font anchorFont = new Font(Font.FontFamily.UNDEFINED, 11);
    anchorFont.setColor(BaseColor.BLUE);
    anchorFont.setStyle(Font.FontStyle.UNDERLINE.getValue());

    Anchor anchor = new Anchor("Google", anchorFont);
    anchor.setReference("https://www.google.com");

    phrase.add(anchor);
    phrase.add(phrase1);
    document.add(phrase);

    document.close();

    } catch (IOException e) {
        e.printStackTrace();
    } catch (DocumentException e) {
        e.printStackTrace();
    }
}

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