This is what i have so far:
package de.inplus.umsys.web.observer.tools;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Map;
import java.util.Set;
import org.springframework.beans.factory.annotation.Required;
import org.springframework.core.io.Resource;
import com.itextpdf.text.Image;
import com.itextpdf.text.Rectangle;
import com.itextpdf.text.pdf.PRStream;
import com.itextpdf.text.pdf.PdfArray;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfDictionary;
import com.itextpdf.text.pdf.PdfGState;
import com.itextpdf.text.pdf.PdfLayer;
import com.itextpdf.text.pdf.PdfName;
import com.itextpdf.text.pdf.PdfNumber;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;
import com.itextpdf.text.pdf.PdfWriter;
public class WatermarkTool {
private Resource watermark;
public void setWatermarkRight(File document, boolean shouldBeMarked)
throws Exception {
try {
byte[] buffer = new byte[(int) document.length()];
InputStream in = new FileInputStream(document);
in.read(buffer);
in.close();
PdfReader reader = new PdfReader(buffer);
PdfDictionary pageDict;
int n = reader.getNumberOfPages();
PdfStamper stamper = new PdfStamper(reader, new
FileOutputStream(
document));
Map<String, PdfLayer> layers =
stamper.getPdfLayers();
boolean wm = false;
if (!layers.isEmpty()) {
Set<String> keys = layers.keySet();
for (String key : keys) {
if
(key.toString().equalsIgnoreCase("watermark"))
wm = true;
}
}
if ((shouldBeMarked==true)&&(wm==false))
{
addWatermarkLayer(reader, stamper);
}
if((shouldBeMarked ==false)&&(wm==true))
{
removeWatermark(reader, stamper);
}
stamper.close();
} catch (Exception e) {
throw e;
} finally {
}
}
private void addWatermarkLayer(PdfReader reader, PdfStamper stamper)
throws Exception {
Image watermarkImage =
Image.getInstance(watermark.getFile().getPath());
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();
}
}
public void removeWatermark(PdfReader reader, PdfStamper stamper){
try {
PdfDictionary root = reader.getCatalog();
root.remove(PdfName.OCPROPERTIES);
PdfDictionary page;
PdfArray contentarray;
PRStream stream;
String content;
PdfDictionary resources;
PdfDictionary xobjects;
for (int i = 0; i < reader.getNumberOfPages(); i++) {
page = reader.getPageN(1);
contentarray =
page.getAsArray(PdfName.CONTENTS);
if (contentarray != null) {
for (int j = 0; j <
contentarray.size(); j++) {
stream = (PRStream)
contentarray.getAsStream(j);
content = new
String(PdfReader.getStreamBytes(stream));
if (content.indexOf("/OC") > 0)
{
stream.put(PdfName.LENGTH, new PdfNumber(0));
stream.setData(new
byte[0]);
}
}
}
resources = page.getAsDict(PdfName.RESOURCES);
xobjects = resources.getAsDict(PdfName.XOBJECT);
for (PdfName name : xobjects.getKeys()) {
stream = (PRStream)
xobjects.getAsStream(name);
if (stream.get(PdfName.OC) == null) {
continue;
}
stream.put(PdfName.LENGTH, new
PdfNumber(0));
stream.setData(new byte[0]);
}
}
stamper.setViewerPreferences(PdfWriter.PageModeUseNone);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public Resource getWatermark() {
return watermark;
}
@Required
public void setWatermark(Resource watermark) {
this.watermark = watermark;
}
}
it is almost perfect. just one last problem: by watermark removes layer
content but not the layer itself. If i understand this right, i have to
remove something else from the PdfDictionary? Can somebody pleas write me
exactly what?
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