My task at the moment is to write a class that can do the following things:
1. Add to an already existing pdf Fail watermark "outdated"
2. Check, whether the document already has this sign
3. Remove the sign
The first two points have been resolved through iText Stamper and layers.
Saly i can't find an example of how to remove the specific layer. Please
Help, who can.
Layer added like this:
private void markAndMovePdfDocument(File pdfFile, String newPath)
throws Exception {
PdfReader reader = new PdfReader(pdfFile.getPath());
PdfStamper stamper = new PdfStamper(reader, new
FileOutputStream(
newPath));
Image watermarkImage = Image.getInstance("d:/watermark.jpg");
PdfLayer wmLayer = new PdfLayer("watermark",
stamper.getWriter());
wmLayer.setOnPanel(true);
// set layer parameters
wmLayer.setPrint("print", true);
wmLayer.setOn(true);
wmLayer.setView(true);
// Prepare transperancy
PdfGState transparent = new PdfGState();
transparent.setStrokeOpacity(0.4f);
transparent.setFillOpacity(0.4f);
PdfContentByte cb;
int toPage = stamper.getReader().getNumberOfPages();
for (int i = 1; i <= toPage; i++) {
cb = stamper.getUnderContent(i);
Rectangle rectangle = stamper.getReader()
.getPageSizeWithRotation(i);
cb.beginLayer(wmLayer);
cb.setGState(transparent); // set block trasparency
properties
// position relative to top
watermarkImage.scaleAbsoluteHeight(rectangle.getHeight() - 20);
watermarkImage.scaleAbsoluteWidth(rectangle.getWidth()
- 20);
float absoluteY = rectangle.getBottom()
+ (rectangle.getHeight() -
watermarkImage.getPlainHeight() - 10);
watermarkImage.setAbsolutePosition(10, 10);
cb.addImage(watermarkImage);
cb.endLayer();
}
stamper.close();
}
any tips on optimizing my code also warmly welcomed.
Thanks in advance
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