服务器端
#coding:utf-8,
import socket
import time
ANY = '0.0.0.0'
SENDERPORT=1501
MCAST_ADDR = '224.168.2.9'
MCAST_PORT = 1600
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
sock.bind((ANY,SENDERPORT)) #绑定发送端口到SENDERPORT，即此例的发送端口为1501
sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 255) #设置使用多播发送
while 1:
time.sleep(10)
sock.sendto('Hello World', (MCAST_ADDR,MCAST_PORT) );
#将'hello world'发送到多播地址的指定端口，属于这个多播组的成员都可以收到这个信息
客户端
#coding:utf-8,
import socket
import time
ANY = '0.0.0.0'
MCAST_ADDR = '224.168.2.9'
MCAST_PORT = 1600
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP) #创建UDP socket
sock.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1) #允许端口复用
sock.bind((ANY,MCAST_PORT)) #绑定监听多播数据包的端口
sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 255) #告诉内核这是一个多播类型的socket
status = sock.setsockopt(socket.IPPROTO_IP, #告诉内核把自己加入指定的多播组，组地址由第三个参数指定
socket.IP_ADD_MEMBERSHIP,
socket.inet_aton(MCAST_ADDR) + socket.inet_aton(ANY));
sock.setblocking(0)
ts = time.time()
while 1:
try:
data, addr = sock.recvfrom(1024)
except socket.error, e:
pass
else:
print "We got data!"
print "FROM: ", addr
print "DATA: ", data
