Java实现PDF文件的分割与加密功能

/**

      * 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();

         }

     }