Page events for Watermarking

31st May 2016
iText PDF
Watermarking.java
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/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2019 iText Group NV
    Authors: iText Software.
 
    For more information, please contact iText Software at this address:
    sales@itextpdf.com
 */
/**
 * Example written by Bruno Lowagie in answer to:
 * http://stackoverflow.com/questions/21575630/adding-watermark-directly-to-the-stream
 * <p>
 * Adding a watermark to the document immediately using a page event.
 */
package com.itextpdf.samples.sandbox.events;
 
import com.itextpdf.io.font.constants.StandardFonts;
import com.itextpdf.kernel.colors.ColorConstants;
import com.itextpdf.kernel.events.Event;
import com.itextpdf.kernel.events.IEventHandler;
import com.itextpdf.kernel.events.PdfDocumentEvent;
import com.itextpdf.kernel.font.PdfFont;
import com.itextpdf.kernel.font.PdfFontFactory;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfPage;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.kernel.pdf.canvas.PdfCanvas;
import com.itextpdf.layout.Canvas;
import com.itextpdf.layout.Document;
import com.itextpdf.layout.element.Cell;
import com.itextpdf.layout.element.Paragraph;
import com.itextpdf.layout.element.Table;
import com.itextpdf.layout.property.TextAlignment;
import com.itextpdf.layout.property.UnitValue;
import com.itextpdf.layout.property.VerticalAlignment;
import com.itextpdf.samples.GenericTest;
import com.itextpdf.test.annotations.type.SampleTest;
 
import org.junit.experimental.categories.Category;
 
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.StringTokenizer;
 
@Category(SampleTest.class)
public class Watermarking extends GenericTest {
    public static final String DATA = "./src/test/resources/data/united_states.csv";
    public static final String DEST = "./target/test/resources/sandbox/events/watermarkings.pdf";
 
    public static void main(String[] args) throws Exception {
        File file = new File(DEST);
        file.getParentFile().mkdirs();
        new Watermarking().manipulatePdf(DEST);
    }
 
    public void process(Table table, String line, PdfFont font, boolean isHeader) {
        StringTokenizer tokenizer = new StringTokenizer(line, ";");
        int c = 0;
        while (tokenizer.hasMoreTokens() && c++ < 3) {
            if (isHeader) {
                table.addHeaderCell(new Cell().add(new Paragraph(tokenizer.nextToken()).setFont(font)));
            } else {
                table.addCell(new Cell().add(new Paragraph(tokenizer.nextToken()).setFont(font)));
            }
        }
    }
 
    @Override
    protected void manipulatePdf(String dest) throws Exception {
        PdfDocument pdfDoc = new PdfDocument(new PdfWriter(DEST));
        Document doc = new Document(pdfDoc);
        pdfDoc.addEventHandler(PdfDocumentEvent.END_PAGE, new WatermarkingEventHandler());
 
        PdfFont font = PdfFontFactory.createFont(StandardFonts.HELVETICA);
        PdfFont bold = PdfFontFactory.createFont(StandardFonts.HELVETICA_BOLD);
 
        Table table = new Table(UnitValue.createPercentArray(new float[]{4, 1, 3})).useAllAvailableWidth();
 
        BufferedReader br = new BufferedReader(new FileReader(DATA));
        String line = br.readLine();
        process(table, line, bold, true);
        while ((line = br.readLine()) != null) {
            process(table, line, font, false);
        }
        br.close();
 
        doc.add(table);
 
        doc.close();
    }
 
 
    protected class WatermarkingEventHandler implements IEventHandler {
        @Override
        public void handleEvent(Event event) {
            PdfDocumentEvent docEvent = (PdfDocumentEvent) event;
            PdfDocument pdfDoc = docEvent.getDocument();
            PdfPage page = docEvent.getPage();
            PdfFont font = null;
            try {
                font = PdfFontFactory.createFont(StandardFonts.HELVETICA_BOLD);
            } catch (IOException e) {
                e.printStackTrace();
            }
            PdfCanvas canvas = new PdfCanvas(page.newContentStreamBefore(), page.getResources(), pdfDoc);
            new Canvas(canvas, pdfDoc, page.getPageSize())
                    .setFontColor(ColorConstants.LIGHT_GRAY)
                    .setFontSize(60)
                    .setFont(font)
                    .showTextAligned(new Paragraph("WATERMARK"), 298, 421, pdfDoc.getPageNumber(page),
                            TextAlignment.CENTER, VerticalAlignment.MIDDLE, 45);
        }
    }
}

Click the following link to see the legacy example for iText 5. Except for security fixes, iText 5 is no longer being developed.



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