byte[] recvData = new byte[1024];
            recvLen = socket.ReceiveFrom(recvData, ref clientEnd);
            //recvStr = Encoding.UTF8.GetString(recvData, 0, recvLen);
            //recvStr = Encoding.Default.GetString(recvData, 0, recvLen);
            //recvStr = Encoding.ASCII.GetString(recvData, 0, recvLen);
            //recvStr = Encoding.BigEndianUnicode.GetString(recvData, 0, recvLen);
            recvStr=Encoding.GetEncoding("GB2312").GetString(recvData, 0, recvLen);