Java Requires Chilkat v11.7.0+

Watermark Only Some of a PDF's Pages

See more PDF Watermark Examples

Demonstrates choosing the pages to stamp. "pages" takes all (the default), first, last, odd, even, or a list of 1-based pages and ranges such as 1,3,5-9,12- where a trailing dash means "to the end". "excludePages" takes the same syntax and is applied afterwards, which is how you say "every page except the cover". The result reports the pages the watermark actually landed on. Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    //  The PDF used in this example is available at four_pages.pdf

    CkPdf pdf = new CkPdf();
    success = pdf.LoadFile("qa_data/pdf/four_pages.pdf");
    if (success == false) {
        System.out.println(pdf.lastErrorText());
        return;
        }

    System.out.println("pages in the document: " + pdf.get_NumPages());

    CkJsonObject json = new CkJsonObject();
    CkJsonObject jsonOut = new CkJsonObject();
    json.UpdateString("type","text");
    json.UpdateString("text","INTERNAL");
    json.UpdateString("id","internal");

    //  Every page except the first.
    json.UpdateString("pages","all");
    json.UpdateString("excludePages","1");
    success = pdf.Watermark("add",json,jsonOut);
    if (success == false) {
        System.out.println(pdf.lastErrorText());
        return;
        }

    System.out.println("every page but the cover: " + jsonOut.stringOf("pages"));

    //  A list of pages and ranges, on a second copy of the document.
    CkPdf pdf2 = new CkPdf();
    success = pdf2.LoadFile("qa_data/pdf/four_pages.pdf");
    if (success == false) {
        System.out.println(pdf2.lastErrorText());
        return;
        }

    CkJsonObject json2 = new CkJsonObject();
    json2.UpdateString("type","text");
    json2.UpdateString("text","APPENDIX");
    json2.UpdateString("id","appendix");
    json2.UpdateString("pages","2,4-");
    success = pdf2.Watermark("add",json2,jsonOut);
    if (success == false) {
        System.out.println(pdf2.lastErrorText());
        return;
        }

    System.out.println("page 2 and 4 onwards: " + jsonOut.stringOf("pages"));

    success = pdf.WriteFile("qa_output/four_pages_internal.pdf");
    if (success == false) {
        System.out.println(pdf.lastErrorText());
        return;
        }

    //  Sample output:

    //  pages in the document: 4
    //  every page but the cover: 2-4
    //  page 2 and 4 onwards: 2,4
  }
}