Java实现图片保存到pdf的某个位置
1、依赖–maven
<dependency><groupId>com.itextpdf</groupId><artifactId>itextpdf</artifactId><version>5.5.13</version></dependency>
2、上代码
package com.hxlinks.hxiot.controller;import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Image;
import com.itextpdf.text.pdf.PdfContentByte;
import com.itextpdf.text.pdf.PdfImportedPage;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;import java.awt.geom.Point2D;
import java.io.*;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.StandardCopyOption;
import java.util.Base64;@Controller
public class PdfApiController {@PostMapping("/api/save-image-to-pdf")public ResponseEntity<String> saveImageToPdf(@RequestBody JsonNode jsonNode) {try {int pageNumber = jsonNode.get("pageNumber").asInt();Point2D.Float position = new Point2D.Float(jsonNode.get("imagePosition").get("x").floatValue(), jsonNode.get("imagePosition").get("y").floatValue());String base64Image = jsonNode.get("base64Image").toString();byte[] imageBytes = Base64.getDecoder().decode(base64Image.split(",")[1]);File originalPdf = new File("D:\\templateFilePath\\测试.pdf");File tempPdf = File.createTempFile("temp", ".pdf");insertImageIntoPdf(originalPdf, tempPdf, pageNumber, position, imageBytes);downloadPdf(tempPdf, "modified_pdf_page_" + pageNumber + ".pdf");return ResponseEntity.ok("图片已成功添加到PDF并保存到D盘。");} catch (IOException | DocumentException e) {e.printStackTrace();return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body("处理PDF时出错。");}}private void insertImageIntoPdf(File originalPdf, File tempPdf, int pageNumber, Point2D.Float position, byte[] imageBytes) throws IOException, DocumentException {PdfReader reader = new PdfReader(new FileInputStream(originalPdf));PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(tempPdf));PdfContentByte canvas = stamper.getOverContent(pageNumber);Image img = Image.getInstance(imageBytes);img.setAbsolutePosition(position.x, position.y);img.scaleToFit(100, 100); canvas.addImage(img);stamper.close();reader.close();}private void downloadPdf(File tempPdf, String fileName) throws IOException {Path sourcePath = tempPdf.toPath();Path targetDir = Paths.get("D:/");Path targetPath = targetDir.resolve(System.currentTimeMillis() + ".pdf");if (Files.exists(targetPath)) {throw new IOException("目标文件已存在:" + targetPath);}Files.createDirectories(targetDir);Files.move(sourcePath, targetPath, StandardCopyOption.REPLACE_EXISTING); }}
3、jsonNode参数,根据需要调整
{"pageNumber":2,"base64Image":"data:image/png;base64,i...................","imagePosition":{"x":100,"y":0},"imageSize":{"width":100,"height":100}
}