判断一个url是否为图片url

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   private final static Pattern IMG_URL = Pattern
           .compile(".*?(gif|jpeg|png|jpg|bmp)");



/**
    * 判断一个url是否为图片url
    *
    * @param url
    * @return
    */
   public static boolean isImgUrl(String url) {
       if (url == null || url.trim().length() == 0)
           return false;
       return IMG_URL.matcher(url).matches();
   }