maven包

<dependency>
  <groupId>com.itextpdf</groupId>
  <artifactId>itextpdf</artifactId>
  <version>5.5.13.3</version> <!-- 使用最新版本 -->
</dependency>

java代码：

import java.io.File;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import com.itextpdf.text.Document;
import com.itextpdf.text.Image;
import com.itextpdf.text.pdf.PdfWriter;

import java.io.FileOutputStream;
import java.util.List;

/**
 * @author frank
 * @description
 * @date 2025/4/24
 */
public class PdfUtils {
    public static void convertImagesToPDF(List<String> imagePaths, String outputPdfPath) {
        Document document = new Document();
        try {
            PdfWriter.getInstance(document, new FileOutputStream(outputPdfPath));
            document.open();

            for (String imagePath : imagePaths) {
                Image image = Image.getInstance(imagePath);
                // 调整图片大小以适应页面
                image.scaleToFit(document.getPageSize().getWidth() - 20, document.getPageSize().getHeight() - 20);
                // 居中图片
                image.setAlignment(Image.MIDDLE);
                document.add(image);
                document.newPage(); // 每张图片新起一页
            }
            document.close();
            System.out.println("PDF 生成成功: " + outputPdfPath);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        String dir = "/Volumes/F/ceshi";
        File file = new File(dir);
        File [] files = file.listFiles();
        for (int i = 0; i < files.length; i++) {
            File f = files[i];
            if (f.getName().contains(".DS_Store")) {
                System.out.println(f.getAbsolutePath());
                continue;
            }
            if (!f.isFile()) {
                String path = f.getAbsolutePath();
                // 获取列表
               File[] filenNews = f.listFiles();
               List<String> imagePaths = new ArrayList<String>();
                for (int i1 = 0; i1 < filenNews.length; i1++) {
                    if (filenNews[i1].getName().contains(".DS_Store")) {
                        continue;
                    }
                    imagePaths.add(filenNews[i1].getAbsolutePath());
                }
                Collections.sort(imagePaths);
                convertImagesToPDF(imagePaths, path + "01.pdf");
            }

        }
    }
}