code: public InputStream getInputStream() throws IOException {
  		FileItemWrap wrapper = getValue();
  
  		if (wrapper != null) {
  			return wrapper.getInputStream();
  		}
  
  		return null;
  	}
docs: Retrieves an input stream of the uploaded file's contents.
  
  @return an input stream of the file's contents, or null if there was no file uploaded
  @throws IOException if there is an error obtaining the input stream from the uploaded file.