Python在网络通讯方面功能强大，今天学习一下Socket通讯的基本方式，分别是UDP通讯和TCP通讯。

UDP通讯

upd 服务端

1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3  4 import socket 5  6 ADDR,PORT = 'localhost',7878 7 sock = socket.socket(socket.AF_INET,socket.SOCK_DGRAM) 8 sock.bind((ADDR,PORT)) 9 10 print 'waiting for connection...'11 12 while True:13     data, addr = sock.recvfrom(1024)14     print('Received data:', data, 'from', addr)

upd客户端

1 #!/usr/bin/env python2 # -*- coding:utf-8 -*-3 4 import socket5 6 ADDR,PORT = 'localhost',78787 sock = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)8 sock.sendto(b'hello,this is a test info !',(ADDR,PORT))

先开启server端，等待client端的接入，每请求一次client会打印如下内容

waiting for connection...

('Received data:', 'hello,this is a test info !', 'from', ('127.0.0.1', 57331))

('Received data:', 'hello,this is a test info !', 'from', ('127.0.0.1', 61396))

('Received data:', 'hello,this is a test info !', 'from', ('127.0.0.1', 61261))

('Received data:', 'hello,this is a test info !', 'from', ('127.0.0.1', 54875))

TCP通讯

TCP服务端

1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3  4 from socket import * 5 import os 6  7 ADDR,PORT = 'localhost',7878 8 sock = socket(AF_INET,SOCK_STREAM) 9 sock.bind((ADDR,PORT))10 sock.listen(5)11 12 while True:13     conn,addr = sock.accept()14     print "new conn:",addr15     while True:16         print 'waiting for connection'17         data = conn.recv(1024)18         if not data:19             print '客户端已经断开'20             break21         print '执行指令',data22         cmd_res = os.popen(data).read() #为执行传回的指令23         if len(cmd_res) == 0:24             print 'cmd has no output...'25 26         conn.send(str(len(cmd_res)).encode('utf-8')) #发送大小27         #client_chk = conn.recv(1024) 解决粘包问题 #wait client to confirm28         conn.send(cmd_res)29         print 'send done'30     conn.close()31 sock.close()

TCP客户端

1 #!/usr/bin/env python 2 # -*- coding:utf-8 -*- 3 from socket import * 4  5 ADDR,PORT = 'localhost',7878 6 sock = socket(AF_INET,SOCK_STREAM) 7 sock.connect((ADDR,PORT)) 8 while True: 9     data = raw_input('>>')10     sock.send(data)11     print('发送信息到%s：%s' % (host, data))12     cmd_size = sock.recv(1024)13     print '命令结果大小 size',cmd_size14     sock.send('准备好接收了，可以发了')15     received_size = 016     received_data = b''17     while received_size < int(cmd_size):18         data = sock.recv(1024)19         received_size += len(data)20         received_data += data21         print received_size22     else:23         print '=================\r\n'24         print 'cmd receive done',received_size25         print 'receive data:\r\n',received_data26 27 sock.close()