java 在pdf中根据关键字位置插入图片（公章、签名等）

1.使用依赖

		<dependency><groupId>com.itextpdf</groupId><artifactId>itext7-core</artifactId><version>7.1.12</version><type>pom</type></dependency>

2.工具类

import com.itextpdf.io.image.ImageData;
import com.itextpdf.io.image.ImageDataFactory;
import com.itextpdf.kernel.geom.Rectangle;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfPage;
import com.itextpdf.kernel.pdf.PdfReader;
import com.itextpdf.kernel.pdf.PdfWriter;
import com.itextpdf.kernel.pdf.canvas.parser.PdfCanvasProcessor;
import com.itextpdf.kernel.pdf.canvas.parser.listener.IPdfTextLocation;
import com.itextpdf.kernel.pdf.canvas.parser.listener.RegexBasedLocationExtractionStrategy;
import com.itextpdf.layout.Document;
import com.itextpdf.layout.element.Image;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;import java.io.File;
import java.util.Collection;/*** @author dume* @ClassName Pdf* @description: TODO* @date 2024年07月03日* @version: 1.0*/
public class PdfUtisl {private static Logger logger = LoggerFactory.getLogger(PdfUtisl.class);public static void main(String[] args)  throws Exception {String input = "D:\\te1.pdf";//通过指定pdf文件名，指定关键字，和指定的pdf文件的待处理页数做参数getKeyWordsLocation("D:\\te1.pdf","D:\\1.png","签名：", 50d,50d,0d,0d);}/*** 得到关键字位置插入图片* @param sourcePath 源文件* @param imagePath 图片位置* @param KEY_WORD 关键字* @param width 图片宽度* @param height 图片高度* @param x 相对关键字平移x轴距离* @param y 相对关键字平移y轴距离*/public static boolean getKeyWordsAndInsertImg(String sourcePath,String imagePath, String KEY_WORD,float width,float height,float x,float y) {try {//得到需要插入的图片ImageData imageData = ImageDataFactory.create(imagePath);//核心思路为对PdfDocument对象采用某种Strategy，这里使用RegexBasedLocationExtractionStrategyPdfReader pr = new PdfReader(sourcePath);//临时路径String UUID= UUIDUtils.createUUID();String tempPath = sourcePath.replace(".pdf","_"+UUID+".pdf");//生成新的PDF文件PdfDocument pd = new PdfDocument(pr, new PdfWriter(tempPath));Document document = new Document(pd);int pageCount = pd.getNumberOfPages();boolean insertFlag = false;//遍历每一页for(int i = 1; i <= pageCount; i++){PdfPage page = pd.getPage(i);//查找页中的匹配文字，并定位到位置。RegexBasedLocationExtractionStrategy strategy = new RegexBasedLocationExtractionStrategy(KEY_WORD);PdfCanvasProcessor processor = new PdfCanvasProcessor(strategy);processor.processPageContent(page);Collection<IPdfTextLocation> resultantLocations = strategy.getResultantLocations();//自定义结果处理if (!resultantLocations.isEmpty()) {for (IPdfTextLocation item : resultantLocations) {Rectangle boundRectangle = item.getRectangle();System.out.println(item.getText());System.out.println("关键字“" + KEY_WORD + "” 的坐标为 x: " + boundRectangle.getX() + "  ,y: " + boundRectangle.getY());Image image = new Image(imageData).scaleAbsolute(width, height).setFixedPosition(i, boundRectangle.getRight() + x, boundRectangle.getBottom()+y);document.add(image);insertFlag = true;break;}}}document.close();pr.close();pd.close();if(insertFlag){logger.info("图片插入成功！");}else{logger.error("图片插入失败！");return false;}File oldfile = new File( sourcePath);oldfile.delete();boolean is = new File(tempPath).renameTo(new File(sourcePath));if(is){logger.info("文件重命名成功！");}else{logger.error("文件重命名失败！");return false;}} catch (Exception e) {e.printStackTrace();logger.error("读取文件插入图片失败！"+e.getMessage());return false;}return true;}}