根据图片地址检查图片格式，今日头条有效

直接看代码

/**
	 * 判断图片格式，如果不是GIF就返回true
	 * 	是GIF就返回false
	 * 
	 * @param imgUrl
	 * @return
	 * @throws HttpException
	 * @throws IOException
	 * @author XiaoMingHui
	 * @date 2017-8-21 上午10:36:22
	 */
	private boolean judgeImgFormat(String imgUrl){
		org.apache.commons.httpclient.methods.GetMethod get = new org.apache.commons.httpclient.methods.GetMethod(imgUrl);
		try {
			new org.apache.commons.httpclient.HttpClient().executeMethod(get);
		} catch (HttpException e) {
			logger.error("判断图片是否为GIF时出现HttpException，异常的图片地址为：" + imgUrl, e);
		} catch (IOException e) {
			logger.error("判断图片是否为GIF时出现IOException，异常的图片地址为：" + imgUrl, e);
		}

		org.apache.commons.httpclient.HeaderElement[] heElements = get.getResponseHeader("Content-Type")
				.getElements();

		for (HeaderElement hElement : heElements) {
			if ("image/gif".equals(hElement.getName())) {
				return false;
			}
		}
		return true;
	}