java获取图片原始尺寸

URL url = null;
InputStream is = null;
BufferedImage img = null;

try {
url = new URL(picurl);
is = url.openStream();
img = ImageIO.read(is);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {

try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}

//System.out.println(img.getHeight()+"/"+img.getWidth());

String str = "{\"width\":\""+img.getWidth()+"\",\"height\":\""+img.getHeight()+"\"}";
out.print(str);