在pdfStamper上使用itext 5.5.6和FullCompression将图像添加到pdf时出错

Question

上周，我们从itext 5.3.6升级到5.5.6，在测试过程中，我们发现在启用完全压缩的现有pdf上添加图像存在问题。请参见下一个代码示例：

  try {

    byte[] imageByte = IOUtils.toByteArray(new FileInputStream("imageToStamp.png"));
    InputStream input = new FileInputStream("originalFile.pdf");
    byte[] inputBytes = IOUtils.toByteArray(input);
    OutputStream output = new FileOutputStream("originalFileStamped.pdf");
    PdfReader pdfReader = new PdfReader(new ByteArrayInputStream(inputBytes));
    PdfStamper pdfStamper = new PdfStamper(pdfReader,output);
  Image image = Image.getInstance(imageByte);
  for(int i=1; i<= pdfReader.getNumberOfPages(); i++){
      PdfContentByte content = pdfStamper.getUnderContent(i);
      image.setAbsolutePosition(100f, 700f);
      content.addImage(image);
  }
  //Full Compresión breaks the final pdf , if you comment that line the final PDF will had the images.
  pdfStamper.setFullCompression();
  pdfStamper.close();
} catch (IOException e) {
  e.printStackTrace();
} catch (DocumentException e) {
  e.printStackTrace();
}

Answer 1

将这一行向上移动：

PdfStamper.setFullCompression();

确保在创建PDFStamper实例后立即使用此方法，问题就会解决。