pdfbox: jpg轉pdf：

/**
     * 使用pdfbox將jpg轉成pdf
     * @param jpgStream jpg輸入流
     * @param pdfPath pdf檔案儲存路徑
     * @throws IOException IOException
     */
    public static void jpgToPdf(InputStream jpgStream, String pdfPath) throws IOException {

        PDDocument pdDocument = new PDDocument();
        BufferedImage image = ImageIO.read(jpgStream);

        PDPage pdPage = new
 
 PDPage(new PDRectangle(image.getWidth(), image.getHeight()));
        pdDocument.addPage(pdPage);
        PDImageXObject pdImageXObject = LosslessFactory.createFromImage(pdDocument, image);
        PDPageContentStream contentStream = new PDPageContentStream(pdDocument, pdPage);
        contentStream.drawImage(pdImageXObject, 0
 
, 0, image.getWidth(), image.getHeight());
        contentStream.close();
        pdDocument.save(pdfPath);
        pdDocument.close();
    }

pdfbox: pdf轉jpg：

static void pdfbox() throws IOException {
        long start = System.currentTimeMillis();
        //pdf路徑
        URL url = new URL("file:///D:/1.pdf"
 
);
        InputStream stream = URLUtil.getStream(url);
        // 載入解析PDF檔案
        PDDocument doc = PDDocument.load(stream);
        PDFRenderer pdfRenderer = new PDFRenderer(doc);
        PDPageTree pages = doc.getPages();
        int pageCount = pages.getCount();
        for (int i = 0; i < pageCount; i++) {
            BufferedImage bim = pdfRenderer.renderImageWithDPI(i, 200);
            ByteArrayOutputStream os = new ByteArrayOutputStream();
            ImageIO.write(bim, "jpg", os);
            byte[] datas = os.toByteArray();
//            InputStream is = new ByteArrayInputStream(datas);
            //jpg檔案轉出路徑
            FileUtil.writeBytes(datas, new File("d:/jpg/" + i + ".jpg"));
        }
        long end = System.currentTimeMillis();
        long time = (end - start) / 1000;
        System.out.println(StrUtil.format("pdf轉jpg耗時： {}s", time));
    }

icepdf: pdf轉jpg

Document document = new Document();
document.setUrl(new URL(pdfUrl));
int pageNum = document.getNumberOfPages();
for (int i = 0; i < pageNum; i++) {
    // 目前僅支援1對1的pdf->jpg
    if (i != 0) {
        continue;
    }
    // 3、pdf -> jpg
    BufferedImage bim = (BufferedImage) document.getPageImage(i,
            GraphicsRenderingHints.SCREEN, Page.BOUNDARY_CROPBOX,
            rotation, scale);
    os = new ByteArrayOutputStream();
    ImageIO.write(bim, "jpg", os);
    // 4、jpg -> fdfs
    byte[] datas = os.toByteArray();
    InputStream is = new ByteArrayInputStream(datas);