Watermark on a pdf wich is embedded in a browser 2007-11-15 - By Adriano Leite Ribero
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Hi,
I am trying to add some watermark to a pdf document. I've followed
correctly the example of the file "AddWatermarkPageNumbers.java" from
"http://itextdocs.lowagie.com/tutorial/general/copystamp/index.php",
and it works properly. I have made some changes to fit the method in
that java file to my purpose without problems, and renamed the method
in it as "addWaterMark", so my method preWaterMark1, which calls it,
works fine:
public static void preWaterMark1(String nameOriginalFile, String
text, String image, String nameOutputFile) {
try {
PdfReader reader = new PdfReader(nameOriginalFile);
PdfStamper stamp = new PdfStamper(reader, new
FileOutputStream(nameOutputFile));
addWaterMark(reader, stamp, text, image);
} catch (Exception e){
System.out.println("MarcaDeAgua.preWaterMark -> Excepci?n: " + e);
}
}
private static void addWaterMark(PdfReader reader, PdfStamper stamp,
String text, String image){... /*works ok*/}
The problem is that i need to do the same with pdf documents that
are not files, they are just in the browser. I start from a String
having the content of a document of that kind, and, following the same
steps I've written preWaterMark2, which uses the same method to write
the watermark. But what I get is just the pdf without any visible
changes, I can?t see any watermark. But I know the String having the
content of the pdf document has changed.
public static String preWaterMark2(String pdfContent, String text,
String image){
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
PdfReader reader = new PdfReader(pdfContent.getBytes("ISO-8859 (See http://ISO-8859.ora-code.com)-1"));
PdfStamper stamp = new PdfStamper(reader, baos);
addWaterMark(reader, stamp, text, image);
} catch (Exception de){
de.printStackTrace();
}
String ret = "";
try{
if (baos.toString()!= null)
ret = baos.toString();
} catch (Exception e){
System.out.println("MarcaDeAgua.preWaterMark -> Excepci?n: " +
e.getMessage());
e.printStackTrace();
}
return ret;
}
I guess the problem could be related to the transforming process
between the String having the PDF content and the byte[] with the same
data. I have tryed to change the "ISO-8859 (See http://ISO-8859.ora-code.com)-1", but it keeps on showing
me a PDF without any watermark.
Does anybody know what could be the problem?
Lot?s of thanks,
Adriano.
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