java实现pdf文件截图的方法【附PDFRenderer.jar下载】

时间:2021-07-21 10:46:14

本文实例讲述了java实现pdf文件截图的方法。分享给大家供大家参考,具体如下:

最近做的一个网站中,有个需求是上传pdf文件,显示pdf的封页,点击封页之后进行在线阅读,这里使用的是PDFRender对pdf进行截图。

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public static boolean createScreenShoot(String source, String target) {
    File file = new File(source);
    if (!file.exists()) {
      System.err.println("路径[" + source + "]对应的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编码
          out.close();
      }
      return true;
    }catch(Exception e){
      e.printStackTrace();
       return true;
    }

另外如果需要在线显示pdf的话,需要设置响应头

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response.setContentType("application/pdf");

附:pdfRender.jar点击此处本站下载

希望本文所述对大家java程序设计有所帮助。

原文链接:http://blog.csdn.net/yangnianbing110/article/details/32702437