iText5报表__水印

1.概述
       添加文档的水印可以通过继承PdfPageEventHelper来完成。
代码如下

import com.itextpdf.text.Document;
import com.itextpdf.text.Element;
import com.itextpdf.text.Font;
import com.itextpdf.text.Font.FontFamily;
import com.itextpdf.text.Phrase;
import com.itextpdf.text.pdf.ColumnText;
import com.itextpdf.text.pdf.GrayColor;
import com.itextpdf.text.pdf.PdfPageEventHelper;
import com.itextpdf.text.pdf.PdfWriter;

/**
 * 水印类.
 *
 * @version V1.0 ,2012-1-1
 * @author xiahui
 *
 */
public class Watermark extends PdfPageEventHelper{
    Font font=new Font(FontFamily.HELVETICA,52,Font.BOLD,new GrayColor(0.75f));

    public void onEndPage (PdfWriter writer, Document document) {
        ColumnText.showTextAligned(
                writer.getDirectContentUnder(),
                Element.ALIGN_CENTER,
                new Phrase(" watermovie",font),
                297.5f,
                421,
                writer.getPageNumber()%2==1?45:-45
        );
    }
}

运行代码参见HeaderAndFooterDemo

参考文献
1.Adding page events to PdfWriter (iText 5).