PdfStamper.close() and ZipOutputStream 2006-08-27 - By Patrick Herber
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Hello!
I'm using iText to put a watermark on existings PDF files.
Here this function, which add the watermark on each page
(I've used the example from the online tutorial):
protected void writePdfWithWatermark(InputStream is,
OutputStream os) throws Exception {
PdfReader reader = new PdfReader(is);
PdfStamper stamp = new PdfStamper(reader, os);
// for each page add a watermark [...]
stamp.close();
}
My application has also a function that allow the users to ZIP more files.
For this function I use the class java.util.zip.ZipOutputStream 
Here an extract of it:
ZipOutputStream zos = new ZipOutputStream(response.getOutputStream());
zos.setMethod(ZipOutputStream.DEFLATED);
zos.setLevel(9);
for (int i = 0; i < files.length; i++) {
// skipped [...]
addZipEntry(path, name, time, zos);
// CALL THE WATERMARK FUNCTION
writePdfWithWatermark(fis, zos);
zos.closeEntry();
}
Now the problem I'm experiencing is that the method stamp.close() (last line
of the writePdfWithWatermark method) seems also to close the underlying
OutputStream (in this case the ZipOutputStream), which here should not
happen (since other files could also be added to the ZIP archive).
If I leave this line than I get a ZIP file containing also the first PDF
file.
If I comment the stamp.close() line, than the ZIP file is complete but the
generated PDF file is not "valid".
Is there a way to close the document without closing the outputstream?
Thanks a lot for any suggestion.
Regards,
Patrick
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