ping 原理及ICMP协议简介

//Ping IP/域名
 public static String pingIPCennect(String ipStr)
 {
  String result = "";
  if (!ipStr.equals(""))
  { try {
      int timeOut = 3000;
      InetAddress address = InetAddress.getByName(ipStr);
       if (address.isReachable(timeOut)) {  
        result = "IP/Host Name:" + ipStr + " is OK";
       } else {
        result = "IP/Host Name:" + ipStr + " is LOSS";
       }
     } catch (Exception e) {
      e.printStackTrace();
     }
  }
  return result;
 }