我正在使用這種方法來展示我的BufferedImage：public void setUriFromInpustream(InputStream in) {      BufferedImage bimg;    try {        bimg = ImageIO.read(in);        originAspectRatio = (double) bimg.getWidth() / (double) bimg.getHeight();        if (width == 0)            width = bimg.getWidth();        if (height == 0)            height = bimg.getHeight();        setPreserveOriginAspectRatio(preserveOriginAspectRatio);    } catch (IOException e) {        // TODO Auto-generated catch block        e.printStackTrace();    }}和bimg.getWidth()正在bimg.getHeight()向我展示NullPointerException。有什么解決辦法嗎？