添加水印-k8凯发天生赢家

此演示向您展示如何将文本水印或图像水印添加到 pdf 文档。

upload

maximum file size: 1 mb. files accepted: pdf.

click here to browse files.

source file:

filename

fileerrors

set text watermark

text:
font:
font size:	the font size must be a valid number. the font size must be a valid number.
color:	the format of color value must be rrggbb.
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set image watermark

image:	click here to browse files customvalidator
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如果这不是您想要的 demo，您可以通过填写表格获取免费定制 demo。

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import com.spire.pdf.fileformat;
import com.spire.pdf.pdfdocument;
import com.spire.pdf.pdfpagebase;
import com.spire.pdf.graphics.*;
import java.awt.*;
import java.awt.geom.dimension2d;
import java.awt.geom.point2d;
import java.awt.geom.rectangle2d;
import java.io.bytearrayinputstream;
public class pdfwatermarkdemo {
    public void addwatermark(string pdffile, string watermarktype, string text, byte[] imagedata){
        string outputfile = "output.pdf";
        pdfdocument pdf=new pdfdocument();
        pdf.loadfromfile(pdffile);
        switch (watermarktype) {
            case "text":
                addtextwatermark(pdf, text);
                break;
            case "image":
                addimagewatermark(pdf, imagedata);
                break;
        }
        pdf.savetofile(outputfile, fileformat.pdf);
        pdf.close();
    }
    public void addimagewatermark(pdfdocument pdf, byte[] imgdata) {
        pdfimage image = pdfimage.fromstream(new bytearrayinputstream(imgdata));
        for (int i = 0; i < pdf.getpages().getcount(); i  ) {
            pdfpagebase page = pdf.getpages().get(i);
            page.getcanvas().save();
            page.getcanvas().settransparency(0.5f, 0.5f, pdfblendmode.multiply);
            page.getcanvas().drawimage(image, new point2d.float(160, 260));
            page.getcanvas().restore();
        }
    }
    public void addtextwatermark(pdfdocument pdf, string text) {
        for (int i = 0; i < pdf.getpages().getcount(); i  ) {
            pdfpagebase page = pdf.getpages().get(i);
            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(text, new pdftruetypefont(new font("arial", font.bold, 80), true), pdfbrushes.getviolet(), 0, 0, new pdfstringformat(pdftextalignment.center));
            brush.getgraphics().restore();
            brush.getgraphics().settransparency(0.5);
            rectangle2d lorect = new rectangle2d.float();
            lorect.setframe(new point2d.float(0, 0), page.getcanvas().getclientsize());
            page.getcanvas().drawrectangle(brush, lorect);
        }
    }
}
                        

using spire.pdf;
using spire.pdf.graphics;
using system.drawing;
using system.io;
namespace demoonlinecode
{
    class watermarkdemo
    {
        public void addwatermark(string pdffile, string watermarktype, string text, byte[] imagedata)
        {
            string outputfile = "output.pdf";
            pdfdocument pdf = new pdfdocument();
            pdf.loadfromfile(pdffile);
            switch (watermarktype)
            {
                case "text":
                    addtextwatermark(pdf, text);
                    break;
                case "image":
                    addimagewatermark(pdf, imagedata);
                    break;
            }
            pdf.savetofile(outputfile, fileformat.pdf);
            pdf.close();
        }
        public void addimagewatermark(pdfdocument pdf, byte[] imgdata)
        {
            pdfimage image = pdfimage.fromstream(new memorystream(imgdata));
            for (int i = 0; i < pdf.pages.count; i  )
            {
                pdfpagebase page = pdf.pages[i];
                page.canvas.save();
                page.canvas.settransparency(0.5f, 0.5f, pdfblendmode.multiply);
                page.canvas.drawimage(image, new system.drawing.pointf(160,260));
                page.canvas.restore();
            }
        }
        public void addtextwatermark(pdfdocument pdf, string text)
        {
            for (int i = 0; i < pdf.pages.count; i  )
            {
                pdfpagebase page = pdf.pages[i];
                pdftilingbrush brush = new pdftilingbrush(new sizef(page.canvas.clientsize.width / 2, page.canvas.clientsize.height / 3));
                brush.graphics.settransparency(0.3f);
                brush.graphics.save();
                brush.graphics.translatetransform(brush.size.width / 2, brush.size.height / 2);
                brush.graphics.rotatetransform(-45);
                brush.graphics.drawstring(text, new pdftruetypefont(new font("arial",80,fontstyle.bold), true), pdfbrushes.violet, 0, 0, new pdfstringformat(pdftextalignment.center));
                brush.graphics.restore();
                brush.graphics.settransparency(0.5f);
                page.canvas.drawrectangle(brush, new rectanglef(new pointf(0, 0), page.canvas.clientsize));
            }
        }
    }
}