使用PDFBox将多个图像合并到单个PDF。

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject;

PDDocument document = new PDDocument();

for (String imagePath : imagePaths) {
    PDPage page = new PDPage();
    document.addPage(page);
    
    PDImageXObject image = PDImageXObject.createFromFile(imagePath, document);
    PDPageContentStream contentStream = new PDPageContentStream(document, page);
    contentStream.drawImage(image, x, y, width, height);
    contentStream.close();
}

document.save(outputPath);
document.close();