java 上传图片同时获得图片的宽和高

public ActionForward upload(ActionMapping mapping, ActionForm form, HttpServletRequest request,
			HttpServletResponse response) throws IOException {
		FileForm fileForm = (FileForm) form;
		FormFile file1 = fileForm.getFile1();
		HashMap<String, Object> jsonMap = new HashMap<String, Object>();
		boolean success = false;
		String message = "";
		String fileURL = "";
		int width = 0;
		int height = 0;
		if (file1 != null) {
			//上传路径
			String dir = request.getSession(true).getServletContext().getRealPath("/uploadFile");
			OutputStream fos = null;
			try {
				// 获得文件后缀
				String type = file1.getFileName().substring(file1.getFileName().lastIndexOf("."),
						file1.getFileName().length());

				BufferedImage bi = ImageIO.read(file1.getInputStream());
//				System.out.println("Width=" + bi.getWidth());
//				System.out.println("Height=" + bi.getHeight());
				width = bi.getWidth();
				height = bi.getHeight();
				// 获取当前时间
				Calendar c = Calendar.getInstance();
				c.setTime(new Date());
				String time = "" + c.get(c.YEAR) + (c.get(c.MONTH) + 1) + c.get(c.DATE) + c.get(c.HOUR_OF_DAY)
						+ c.get(c.MINUTE) + c.get(c.SECOND);

				String newname = time + type;
				fileURL = "uploadFile/" + newname;
				fos = new FileOutputStream(dir + "/" + newname);
				fos.write(file1.getFileData(), 0, file1.getFileSize());
				fos.flush();
				success = true;
				message = "图片上传成功";
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
				success = false;
				message = "图片上传失败";
			} finally {
				try {
					fos.close();
				} catch (Exception e) {
					success = false;
					message = "图片上传失败";
				}
			}
		}
		jsonMap.put("success", success);
		jsonMap.put("message", message);
		jsonMap.put("fileURL", fileURL);
		jsonMap.put("width", width);
		jsonMap.put("height", height);
		String json = Convert.mapTojson(jsonMap).toString();
		// 设置响应内容格式
		response.setContentType("text/html;charset=utf-8");
		// 获取流
		PrintWriter out = response.getWriter();
		// 将数据以json格式打到客户端
		out.print(json);
		// 清空缓存
		out.flush();
		// 关闭流
		out.close();
		//页面跳转
		return null;
	}

 主要利用BufferedImage类获取图片的高度和宽度