• 奥展项目笔记13-给生成的pdf加盖印章


    1.添加maven依赖

    <dependency>
                <groupId>com.itextpdf</groupId>
                <artifactId>itextpdf</artifactId>
                <version>5.5.6</version>
            </dependency>

    2.获得透明的png格式的电子印章图片的工具类

    package lucky.aozhan.user.utils;
    
    import javax.imageio.ImageIO;
    import javax.swing.*;
    import java.awt.*;
    import java.awt.image.BufferedImage;
    import java.io.*;
    
    public class PNGchange {
        public static void main(String[] args) {
            System.out.println(transferAlpha2File("D:\resource\yinzhang\aozhanyzimg.png", "D:\resource\yinzhang\aozhanyzimg_1.png"));
        }
    
        public static boolean transferAlpha2File(String imgSrc, String imgTarget) {
            File file = new File(imgSrc);
            InputStream is = null;
            boolean result = false;
            try {
                is = new FileInputStream(file);
                // 如果是MultipartFile类型,那么自身也有转换成流的方法:is = file.getInputStream();
                BufferedImage bi = ImageIO.read(is);
                Image image = (Image) bi;
                ImageIcon imageIcon = new ImageIcon(image);
                BufferedImage bufferedImage = new BufferedImage(imageIcon.getIconWidth(), imageIcon.getIconHeight(),
                        BufferedImage.TYPE_4BYTE_ABGR);
                Graphics2D g2D = (Graphics2D) bufferedImage.getGraphics();
                g2D.drawImage(imageIcon.getImage(), 0, 0, imageIcon.getImageObserver());
                int alpha = 0;
                for (int j1 = bufferedImage.getMinY(); j1 < bufferedImage.getHeight(); j1++) {
                    for (int j2 = bufferedImage.getMinX(); j2 < bufferedImage.getWidth(); j2++) {
                        int rgb = bufferedImage.getRGB(j2, j1);
                        int R = (rgb & 0xff0000) >> 16;
                        int G = (rgb & 0xff00) >> 8;
                        int B = (rgb & 0xff);
                        if (((255 - R) < 30) && ((255 - G) < 30) && ((255 - B) < 30)) {
                            rgb = ((alpha + 1) << 24) | (rgb & 0x00ffffff);
                        }
                        bufferedImage.setRGB(j2, j1, rgb);
                    }
                }
                g2D.drawImage(bufferedImage, 0, 0, imageIcon.getImageObserver());
                result = ImageIO.write(bufferedImage, "png", new File(imgTarget));// 直接输出文件
            } catch (Exception e) {
                e.printStackTrace();
                result = false;
            } finally {
                if (is != null) {
                    try {
                        is.close();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                    }
                }
            }
            return result;
        }
    
        public static byte[] transferAlpha2Byte(String imgSrc) {
            ByteArrayOutputStream byteArrayOutputStream = null;
            File file = new File(imgSrc);
            InputStream is = null;
            byte[] result = null;
            try {
                is = new FileInputStream(file);
                // 如果是MultipartFile类型,那么自身也有转换成流的方法:is = file.getInputStream();
                BufferedImage bi = ImageIO.read(is);
                Image image = (Image) bi;
                ImageIcon imageIcon = new ImageIcon(image);
                BufferedImage bufferedImage = new BufferedImage(imageIcon.getIconWidth(), imageIcon.getIconHeight(),
                        BufferedImage.TYPE_4BYTE_ABGR);
                Graphics2D g2D = (Graphics2D) bufferedImage.getGraphics();
                g2D.drawImage(imageIcon.getImage(), 0, 0, imageIcon.getImageObserver());
                int alpha = 0;
                for (int j1 = bufferedImage.getMinY(); j1 < bufferedImage.getHeight(); j1++) {
                    for (int j2 = bufferedImage.getMinX(); j2 < bufferedImage.getWidth(); j2++) {
                        int rgb = bufferedImage.getRGB(j2, j1);
    
                        int R = (rgb & 0xff0000) >> 16;
                        int G = (rgb & 0xff00) >> 8;
                        int B = (rgb & 0xff);
                        if (((255 - R) < 30) && ((255 - G) < 30) && ((255 - B) < 30)) {
                            rgb = ((alpha + 1) << 24) | (rgb & 0x00ffffff);
                        }
    
                        bufferedImage.setRGB(j2, j1, rgb);
    
                    }
                }
    
                g2D.drawImage(bufferedImage, 0, 0, imageIcon.getImageObserver());
                byteArrayOutputStream = new ByteArrayOutputStream();
                ImageIO.write(bufferedImage, "png", byteArrayOutputStream);//转换成byte数组
                result = byteArrayOutputStream.toByteArray();
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                if (is != null) {
                    try {
                        is.close();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                    }
                }
                if (byteArrayOutputStream != null) {
                    try {
                        byteArrayOutputStream.close();
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                    }
                }
            }
            return result;
        }
    
    }

    3.添加印章的工具类

    package lucky.aozhan.user.utils;
    
    import com.itextpdf.text.DocumentException;
    import com.itextpdf.text.Image;
    import com.itextpdf.text.pdf.PdfContentByte;
    import com.itextpdf.text.pdf.PdfReader;
    import com.itextpdf.text.pdf.PdfStamper;
    import com.itextpdf.text.pdf.parser.ImageRenderInfo;
    import com.itextpdf.text.pdf.parser.PdfReaderContentParser;
    import com.itextpdf.text.pdf.parser.RenderListener;
    import com.itextpdf.text.pdf.parser.TextRenderInfo;
    
    import java.awt.geom.Rectangle2D;
    import java.io.FileOutputStream;
    import java.io.IOException;
    
    public class AddYingZhangImgUtil {
        public static void main(String[] args) throws IOException, DocumentException {
            // 模板文件路径
            String templatePath = "D:\resource\yinzhang\p869.pdf";
            // 生成的文件路径
            String targetPath = "D:\resource\yinzhang\p869_new.pdf";
            // 图片路径, 需要png透明图片,否则会覆盖文字
            String imagePath = "D:\resource\yinzhang\aozhanyzimg_1.png";
    
            addSignImg(templatePath, targetPath, imagePath, "INSPECTION", null);
    
        }
    
        /**
         * 根据pdf中的关键字,获取文字的绝对位置,并进行签章
         *
         * @param inputPath  未处理pdf
         * @param targetPath 已签章pdf地址
         * @param imagePath  签章图片地址
         * @param inputPath  pdf中的关键字
         * @param pageNum    pdf页数,可传null,默认设置最大页数
         * @return float的x与y值
         * @throws IOException
         */
        private static void addSignImg(String inputPath, String targetPath, final String imagePath, final String keyWord, Integer pageNum) throws IOException, DocumentException {
            PdfReader pdfReader = new PdfReader(inputPath);
            // 读图片
            final Image image = Image.getInstance(imagePath);
            // 根据域的大小缩放图片
            image.scaleToFit(100, 100);
            image.setRotationDegrees(15);//设置印章图片的旋转角度
    
            if (null == pageNum) {
                pageNum = pdfReader.getNumberOfPages();
            }
            new PdfReaderContentParser(pdfReader).processContent(pageNum, new RenderListener() {
                public void beginTextBlock() {
    
                }
    
                public void renderText(TextRenderInfo textRenderInfo) {
                    String text = textRenderInfo.getText();
                    if (text != null && text.contains(keyWord)) {
                        // 文字在page中的横坐标、纵坐标
                        com.itextpdf.awt.geom.Rectangle2D.Float textFloat = textRenderInfo.getBaseline().getBoundingRectange();
                        float x = textFloat.x;
                        float y = textFloat.y;
                        // 设置图片位置
                        image.setAbsolutePosition(x + 50f, y - 30f);
                    }
                }
    
                public void endTextBlock() {
    
                }
    
                public void renderImage(ImageRenderInfo renderInfo) {
    
                }
            });
            // 获取操作的页面
            PdfStamper stamper = new PdfStamper(pdfReader, new FileOutputStream(targetPath));
            PdfContentByte under = stamper.getOverContent(pageNum);
            under.addImage(image);
            stamper.close();
            pdfReader.close();
        }
    }

    4.效果图

    参考文献:

    https://blog.csdn.net/weixin_39515661/article/details/90402601?depth_1-utm_source=distribute.pc_relevant.none-task&utm_source=distribute.pc_relevant.none-task

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  • 原文地址:https://www.cnblogs.com/luckyplj/p/12454360.html
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