学步园

/**
  * 判断链接是否有效
  * 输入链接
  * 返回true或者false
  */
 public static boolean isValid(String strLink) {
  URL url;
  try {
   url = new URL(strLink);
   HttpURLConnection connt = (HttpURLConnection)url.openConnection();
   connt.setRequestMethod("HEAD");
   String strMessage = connt.getResponseMessage();
   if (strMessage.compareTo("Not Found") == 0) {
    return false;
   }
   connt.disconnect();
  } catch (Exception e) {
   return false;
  }
  return true;
 }