java 添加 pdf 文本水印-ag凯发旗舰厅

本文将详细讲解如何使用spire.pdf for java 为pdf文档添加文本水印。

import com.spire.pdf.*;
import com.spire.pdf.graphics.*;
import java.awt.*;
import java.awt.geom.*;
public class textwatermark {
    public static void main(string[] args) {
        //创建pdfdocument对象
        pdfdocument pdf = new pdfdocument();
        //加载示例文档
        pdf.loadfromfile("c:\\users\\administrator\\desktop\\sample.pdf");
        //获取第一页
        pdfpagebase page = pdf.getpages().get(0);
        //调用insertwatermark方法插入文本水印
        insertwatermark(page, "e-iceblue");
      //保存文档
        pdf.savetofile("out/textwatermark.pdf");
    }
    static void insertwatermark(pdfpagebase page, string watermark) {
        dimension2d dimension2d = new dimension();
        dimension2d.setsize(page.getcanvas().getclientsize().getwidth() / 2, page.getcanvas().getclientsize().getheight() / 3);
        pdftilingbrush brush = new pdftilingbrush(dimension2d);
        brush.getgraphics().settransparency(0.3f);
        brush.getgraphics().save();
        brush.getgraphics().translatetransform((float) brush.getsize().getwidth() / 2, (float) brush.getsize().getheight() / 2);
        brush.getgraphics().rotatetransform(-45);
        brush.getgraphics().drawstring(watermark, new pdffont(pdffontfamily.helvetica, 24), pdfbrushes.getviolet(), 0, 0, new pdfstringformat(pdftextalignment.center));
        brush.getgraphics().restore();
        brush.getgraphics().settransparency(1);
        rectangle2d lorect = new rectangle2d.float();
        lorect.setframe(new point2d.float(0, 0), page.getcanvas().getclientsize());
        page.getcanvas().drawrectangle(brush, lorect);
    }
}