PC6下载站

分类分类

将pdf文件转成图片并删除java源代码

关注+2011-02-11作者:清晨

 将pdf文件转成图片并删除java源代码/**

  * 将pdf转成img

  */

  public static void changePdfToImg() {

  try {

  File file = new File("E:\\test\\baseInfo_2.pdf");

  RandomAccessFile raf = new RandomAccessFile(file, "r");

  FileChannel channel = raf.getChannel();

  MappedByteBuffer buf = channel.map(FileChannel.MapMode.READ_ONLY, 0, channel.size());

  PDFFile pdffile = new PDFFile(buf);

  for (int i = 1; i <= pdffile.getNumPages(); i++) {

  PDFPage page = pdffile.getPage(i);

  Rectangle rect = new Rectangle(0, 0, ((int) page.getBBox().getWidth()), ((int) page.getBBox().getHeight()));

  Image img = page.getImage(rect.width, rect.height, 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("E:\\test\\img\\" + i + ".jpg"); // 输出到文件流

  JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);

  JPEGEncodeParam param2 = encoder.getDefaultJPEGEncodeParam(tag);

  param2.setQuality(1f, false);// 1f是提高生成的图片质量

  encoder.setJPEGEncodeParam(param2);

  encoder.encode(tag); // JPEG编码

  out.close();

  }

  channel.close();

  raf.close();

  unmap(buf);//如果要在转图片之后删除pdf,就必须要这个关闭流和清空缓冲的方法

  } catch (FileNotFoundException e) {

  e.printStackTrace();

  } catch (IOException e) {

  e.printStackTrace();

  }

  }

  /**

  * 清空缓冲

  * @param buffer

  */

  public static void unmap(final Object buffer) {

  AccessController.doPrivileged(new PrivilegedAction() {

  public Object run() {

  try {

  Method getCleanerMethod = buffer.getClass().getMethod("cleaner", new Class[0]);

  getCleanerMethod.setAccessible(true);

  sun.misc.Cleaner cleaner = (sun.misc.Cleaner) getCleanerMethod.invoke(buffer, new Object[0]);

  cleaner.clean();

  } catch (Exception e) {

  e.printStackTrace();

  }

  return null;

  }

  });

  }

展开全部

相关文章

更多+相同厂商

热门推荐

  • 最新排行
  • 最热排行
  • 评分最高
排行榜

    点击查看更多

      点击查看更多

        点击查看更多

        说两句网友评论

          我要评论...
          取消