java PDF 加密 分割 和 生成封面图操作

/**
     * 加密文件测试
     * @from fhadmin.cn
     */
    @Test
    public void encryptTest(){
        try {
            String filePath = "D:\\test\\像李开复一样思考人生.pdf";
            String password = "1234";
            PDDocument document = PDDocument.load(new File(filePath));
            StandardProtectionPolicy spp = new StandardProtectionPolicy(password, password,new AccessPermission());
            document.protect(spp);
            String newFilePath = "D:\\test\\像李开复一样思考人生2.pdf";
            document.save(newFilePath);
            document.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

/**
     * 切割文件测试
     * @from fhadmin.cn
     */
    @Test
    public void extractTest(){
        try {
            String newFilePath = "D:\\test\\像李开复一样思考人生2.pdf";
            String password = "1234";
            PDDocument document = PDDocument.load(new File(newFilePath), password);//带密码读取
            //从第一页截取到第二页
            PageExtractor pageExtractor = new PageExtractor(document, 1, 2);
            PDDocument extract = pageExtractor.extract();
            extract.save("D:\\test\\像李开复一样思考人生free.pdf");
            extract.close();
            document.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
    }

/**
     * 切割文件测试
     * @from fhadmin.cn
     */
    @Test
    public void createCoverPicTest(){
        try {
            String pdfPath = "D:\\test\\像李开复一样思考人生.pdf";
            File file = new File(pdfPath);
            //order目录
            String orderPath = file.getParent();
            //转换后的img目录
            String bookName = file.getName().substring(0,file.getName().lastIndexOf("."));
            String imgPath = orderPath + File.separator +bookName+".png";
            log.debug("pdf封面图生成成功:{}", imgPath);
            PDDocument pdDocument = PDDocument.load(new File(pdfPath));
            PDFRenderer renderer = new PDFRenderer(pdDocument);
            /* 第二位参数越大转换后越清晰，相对转换速度越慢 */
            BufferedImage image = renderer.renderImageWithDPI(0, 150);
            ImageIO.write(image, "png", new File(imgPath));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }