apollo-core/src/main/java/com/ctrip/framework/foundation/internals/NetworkInterfaceManager.java/NetworkInterfaceManager/getLocalHostName
class NetworkInterfaceManager:  public String getLocalHostName() {
    try {
      if (null == m_localHost) {
        m_localHost = InetAddress.getLocalHost();
      }
      return m_localHost.getHostName();
    } catch (UnknownHostException e) {
      return m_local.getHostName();
    }
  }