def _connect_server(self):
        '''连接服务器,建立socket'''
        try:
            self._sock = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
            self._sock.connect((self._server_ip,self._server_port))
            #PRINT('Connect [%s:%d] success!'%(self._server_ip,self._server_port), GREEN)
        except socket.error, e:
            sys.stderr.write('ERROR: %s[%s:%d]'%(e,self._server_ip,self._server_port))
            traceback.print_exc()
            sys.exit(1)