void FortuneServer::incomingConnection(int socketDescriptor)
{
     TcpClientSocket *clientConnection=new TcpClientSocket(this);
     if (!clientConnection->setSocketDescriptor(socketDescriptor))
     {
         return;
     }
     QString Iip=clientConnection->peerAddress ().toString();获取客户端ip
     qDebug()<<Iip;
}