通过url获取图片的宽高

 1     private static Map<String, Long> getPictureHeightAndWidthMap(String picUrl) {
 2         Map<String, Long> map = new HashMap();
 3         try {
 4             URL url = new URL(picUrl);
 5             HttpURLConnection connection = (HttpURLConnection) url
 6                     .openConnection();
 7             DataInputStream in = new DataInputStream(
 8                     connection.getInputStream());
 9             BufferedImage image = ImageIO.read(in);
10             map.put("w", image.getWidth() * 1L);
11             map.put("h", image.getHeight() * 1L);
12             connection.disconnect();
13             in.close();
14         } catch (IOException e) {
15             e.printStackTrace();
16         }
17         return map;
18     }
19 
20     public static Long getHeight(String picUrl) {
21         Map<String, Long> map = getPictureHeightAndWidthMap(picUrl);
22         return null == map.get("h") ? 0 : map.get("h");
23     }
24 
25     public static Long getWidth(String picUrl) {
26         Map<String, Long> map = getPictureHeightAndWidthMap(picUrl);
27         return null == map.get("w") ? 0 : map.get("w");
28     }