/**
 * 上传图片
 * @param file
 * @return
 * @throws IOException 
 * @throws Exception
 */
 @RequestMapping(value = "/uploadImg", method = RequestMethod.POST, produces = "text/html;charset=UTF-8")
 public String upload(@RequestParam(value = "file", required = true) MultipartFile file) {
 System.out.println(file.getContentType());
 System.out.println(file.getName());
 System.out.println(file.getOriginalFilename());
 
 try {
 BufferedImage image = ImageIO.read(file.getInputStream());
 if (image != null) {//如果image=null 表示上传的不是图片格式
 System.out.println(image.getWidth());//获取图片宽度，单位px
 System.out.println(image.getHeight());//获取图片高度，单位px
 }
 } catch (IOException e) {
 e.printStackTrace();
 }
 
 return "hello";
 }