java 在 pdf 中添加骑缝章-ag凯发旗舰厅

本文将介绍如何使用spire.pdf在java应用程序中给pdf格式的合同文件添加骑缝章。

import com.spire.pdf.*;
import com.spire.pdf.graphics.*;
import javax.imageio.imageio;
import java.awt.*;
import java.awt.geom.point2d;
import java.awt.image.bufferedimage;
import java.io.*;
public class addseamseals {
    public static void main(string[] args) throws ioexception {
        //加载示例文档
        pdfdocument doc = new pdfdocument();
        doc.loadfromfile("contract.pdf");
        pdfunitconvertor convert = new pdfunitconvertor();
        pdfpagebase pagebase = null;
        //获取分割后的印章图片
        bufferedimage[] images = getimage(doc.getpages().getcount());
        float x = 0;
        float y = 0;
        //将图片画到pdf页面上的指定位置
        for (int i = 0; i < doc.getpages().getcount(); i  )
        {
            bufferedimage image= images[ i ];
            pagebase = doc.getpages().get(i);
            x = (float)pagebase.getsize().getwidth() - convert.convertunits(image.getwidth(), pdfgraphicsunit.point, pdfgraphicsunit.pixel)   40;
            y = (float) pagebase.getsize().getheight()/ 2;
            pagebase.getcanvas().drawimage(pdfimage.fromimage(image), new point2d.float(x, y));
        }
        //保存pdf
        doc.savetofile("result.pdf");
    }
    //定义getimage方法，根据pdf页数分割印章图片
    static bufferedimage[] getimage(int num) throws ioexception {
        string originalimg = "stamp.png";
        bufferedimage image = imageio.read(new file(originalimg));
        int rows = 1;
        int cols = num;
        int chunks = rows * cols;
        int chunkwidth = image.getwidth() / cols;
        int chunkheight = image.getheight() / rows;
        int count = 0;
        bufferedimage[] imgs = new bufferedimage[ chunks ];
        for (int x = 0; x < rows; x  ) {
            for (int y = 0; y < cols; y  ) {
                imgs[ count ] = new bufferedimage(chunkwidth, chunkheight, image.gettype());
                graphics2d gr = imgs[ count   ].creategraphics();
                gr.drawimage(image, 0, 0, chunkwidth, chunkheight,
                        chunkwidth * y, chunkheight * x,
                        chunkwidth * y   chunkwidth, chunkheight * x   chunkheight, color.white,null);
                gr.dispose();
            }
        }
        return imgs;
    }
}

骑缝章效果图：