tcp/udp客户端服务端

udp服务端：

# -*- coding: utf_8 -*-
import socket  
  
# address = ('39.105.45.48', 5683)  
address = ('127.0.0.1', 5683)  
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)  
s.bind(address)  
  
while True:  
    data, addr = s.recvfrom(2048)  
    if not data:  
        print "client has exist"  
        break  
    print "received:", data, "from", addr  
  
s.close()  

 

udp客户端：

# -*- coding: utf_8 -*-
import socket  
  
address = ('39.105.45.48', 5683)  
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)  
  
while True:  
    msg = raw_input()  
    if not msg:  
        break  
    s.sendto(msg, address)  
  
s.close()  

udp广播：

import socket
s=socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
s.setsockopt(socket.SOL_SOCKET,socket.SO_BROADCAST,1)

hostname = socket.gethostname()
ip = socket.gethostbyname(hostname)
s.bind((ip,9999))
addr=(' ',9999)
s.sendto('buffer',addr)
s.close()

tcp客户端：

# 导入socket库:
import socket
# 创建一个socket:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# 建立连接:
s.connect(('127.0.0.1', 9999))
# 接收欢迎消息:
print s.recv(1024)
for data in ['Michael', 'Tracy', 'Sarah']:
    # 发送数据:
    s.send(data)
    print s.recv(1024)
s.send('exit')
s.close()

tcp服务端：

import socket,threading,time
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(('127.0.0.1', 9999))
s.listen(5)
print 'Waiting for connection...'

def tcplink(sock, addr):
    print 'Accept new connection from %s:%s...' % addr
    sock.send('Welcome!')
    while True:
        data = sock.recv(1024)
        time.sleep(1)
        if data == 'exit' or not data:
            break
        sock.send('Hello, %s!' % data)
    sock.close()
    print 'Connection from %s:%s closed.' % addr
    
while True:
    # 接受一个新连接:
    sock, addr = s.accept()
    # 创建新线程来处理TCP连接:
    t = threading.Thread(target=tcplink, args=(sock, addr))
    t.start()