public static boolean createScreenShoot(String source, String target) {
    File file = new File(source);
    if (!file.exists()) {
      System.err.println("路徑[" + source + "]對應(yīng)的pdf文件不存在!");
      return false;
    }
    try{
      RandomAccessFile raf = new RandomAccessFile(file, "r");
      FileChannel channel = raf.getChannel();
      ByteBuffer buf = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());
      PDFFile pdffile = new PDFFile(buf);
      int num = pdffile.getNumPages();
      for(int i = 1; i < num; i++){
         PDFPage page = pdffile.getPage(1);
          // get the width and height for the doc at the default zoom
          Rectangle rect = new Rectangle(0, 0, (int) page.getBBox()
              .getWidth(), (int) page.getBBox().getHeight());
          // generate the image
          Image img = page.getImage(rect.width, rect.height, // width &
              rect, // clip rect
              null, // null for the ImageObserver
              true, // fill background with white
              true // block until drawing is done
              );
          BufferedImage tag = new BufferedImage(rect.width, rect.height,   BufferedImage.TYPE_INT_RGB);
          tag.getGraphics().drawImage(img, 0, 0, rect.width, rect.height,null);
          FileOutputStream out = new FileOutputStream(target+i+"jpg");
          JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
          encoder.encode(tag); // JPEG編碼
          out.close();
      }
      return true;
    }catch(Exception e){
      e.printStackTrace();
       return true;
    }

response.setContentType("application/pdf");