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    /**
     * BufferedImage转成 PDFbase64
     *
     * @param bufferedImage
     * @return
     * @throws IOException
     */
    public static String getBufferedImageToPDFBase64(BufferedImage bufferedImage) throws IOException, BadElementException {
        ByteArrayOutputStream baos = null;
        //转base64 io流
        baos = new ByteArrayOutputStream();
        //io流
        ByteArrayOutputStream pdfbaos = new ByteArrayOutputStream();
        String base64Img = null;
        // 写入流中
        ImageIO.write(bufferedImage, "png", baos);
        baos.flush();
        Image image = Image.getInstance(baos.toByteArray());
        Document document = new Document();
        //设置文档页边距
        document.setMargins(0, 0, 0, 0);
        try {
            PdfWriter.getInstance(document, pdfbaos);
            //打开文档
            document.open();
            //获取图片的宽高
            float imageHeight = image.getScaledHeight();
            float imageWidth = image.getScaledWidth();
            //设置页面宽高与图片一致
            Rectangle rectangle = new Rectangle(imageWidth, imageHeight);
            document.setPageSize(rectangle);
            //图片居中
            image.setAlignment(Image.ALIGN_CENTER);
            //新建一页添加图片
            document.newPage();
            document.add(image);
        } catch (Exception ioe) {
            System.out.println(ioe.getMessage());
        } finally {
            //关闭文档
            document.close();
            try {
                base64Img = Base64Util.encode(pdfbaos.toByteArray());
                pdfbaos.flush();
                pdfbaos.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return base64Img;
    }
     /**
     * PDF base64编码 转换为 BufferedImage
     *
     * @param base64
     * @return
     */
    private static BufferedImage pdfBase64ToBufferedImage(String base64) throws IOException {
        byte[] image = Base64Util.decode(base64);
        ByteArrayInputStream stream = new ByteArrayInputStream(image);
        PDDocument doc = null;
        try {
            doc = PDDocument.load(stream);
            PDFRenderer renderer = new PDFRenderer(doc);
            BufferedImage bufferedImage = renderer.renderImageWithDPI(0, 162.8f);
            return bufferedImage;
        } catch (Exception e) {
            e.printStackTrace();
        }

        return null;
    }

pom.xml引入

    <dependency>
      <groupId>org.apache.pdfbox</groupId>
      <artifactId>pdfbox</artifactId>
      <version>2.0.24</version>
    </dependency>