JAVA通过itextpdf实现PDF骑缝章

先引入pom引入jar包

<dependency>
    <groupId>com.itextpdf</groupId>
    <artifactId>itextpdf</artifactId>
    <version>5.0.6</version>
 </dependency>

第一步切割图片

/**
     * 切割图片
     * @param Path  图片路径
     * @param n 切割份数
     */
    public static Image[] slicingImages(String Path,int n) throws IOException, BadElementException {
        Image[] nImage = new Image[n];
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        BufferedImage img = ImageIO.read(new File(Path));
        int h = img.getHeight();
        int w = img.getWidth();

        int sw = w/n;
        for(int i=0;i<n;i++){
            BufferedImage subImg;
            if(i==n-1){//最后剩余部分
                subImg = img.getSubimage(i * sw, 0, w-i*sw, h);
            }else {//前n-1块均匀切
                subImg = img.getSubimage(i * sw, 0, sw, h);
            }

            ImageIO.write(subImg,Path.substring(Path.lastIndexOf(.)+1),out);
            nImage[i] = Image.getInstance(out.toByteArray());
            out.flush();
            out.reset();
        }
        return nImage;
    }

第二步盖！！！

/**
     *  盖骑缝章
     *
     * @param infilePath    原PDF路径
     * @param outFilePath    输出PDF路径
     */
    public static void stamperCheckMarkPDF(String infilePath,String outFilePath,String picPath) throws IOException, DocumentException {
        PdfReader reader = new PdfReader(infilePath);//选择需要印章的pdf
        PdfStamper stamp = new PdfStamper(reader, new FileOutputStream(outFilePath));//加完印章后的pdf

        Rectangle pageSize = reader.getPageSize(1);//获得第一页
        float height = pageSize.getHeight();
        float width  = pageSize.getWidth();

        int nums = reader.getNumberOfPages();
        Image[] nImage =  subImages(picPath,nums);//生成骑缝章切割图片


        for(int n=1;n<=nums;n++){
            PdfContentByte over = stamp.getOverContent(n);//设置在第几页打印印章
            Image img = nImage[n-1];//选择图片
            img.setAbsolutePosition(width-img.getWidth(),height/2-img.getHeight()/2);//控制图片位置
            over.addImage(img);
        }
        stamp.close();
    }

最后一步调用

public static void main(String[] args) throws IOException, DocumentException {
        String infilePath = "C:\Users\Best\Desktop\test.pdf";
        String outfilePaht = "C:\Users\Best\Desktop\test112.pdf";
        String picPath = "C:\Users\Best\Desktop\签章1.png";
        stamperCheckMarkPDF(infilePath,outfilePaht,picPath);
    }

因为签章是公司的就不给大家展示了，直接CV大法试试效果