python网络编程linux清华_Python网络编程实现TCP和UDP连接

Python网络编程实现TCP和UDP连接

实现TCP

#!/usr/bin/env python3

# -*- coding: utf-8 -*-

import socket

# 创建一个socket:

s &＃61; socket.socket(socket.AF_INET, socket.SOCK_STREAM)

# 建立连接:

s.connect((&＃39;www.sina.com.cn&＃39;, 80))

# 发送数据:

s.send(b&＃39;GET / HTTP/1.1\r\nHost: www.sina.com.cn\r\nConnection: close\r\n\r\n&＃39;)

# 接收数据:

buffer &＃61; []

while True:

# 每次最多接收1k字节:

d &＃61; s.recv(1024)

if d:

buffer.append(d)

else:

break

data &＃61; b&＃39;&＃39;.join(buffer)

# 关闭连接:

s.close()

header, html &＃61; data.split(b&＃39;\r\n\r\n&＃39;, 1)

print(header.decode(&＃39;utf-8&＃39;))

# 把接收的数据写入文件:

with open(&＃39;sina.html&＃39;, &＃39;wb&＃39;) as f:

f.write(html)

实现UDP连接

服务端&＃xff1a;

#!/usr/bin/env python3

# -*- coding: utf-8 -*-

import socket

s &＃61; socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

# 绑定端口:

s.bind((&＃39;127.0.0.1&＃39;, 9999))

print(&＃39;Bind UDP on 9999...&＃39;)

while True:

# 接收数据:

data, addr &＃61; s.recvfrom(1024)

print(&＃39;Received from %s:%s.&＃39; % addr)

reply &＃61; &＃39;Hello, %s!&＃39; % data.decode(&＃39;utf-8&＃39;)

s.sendto(reply.encode(&＃39;utf-8&＃39;), addr)

客户端&＃xff1a;

#!/usr/bin/env python3

# -*- coding: utf-8 -*-

import socket

s &＃61; socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

for data in [b&＃39;Michael&＃39;, b&＃39;Tracy&＃39;, b&＃39;Sarah&＃39;]:

# 发送数据:

s.sendto(data, (&＃39;127.0.0.1&＃39;, 9999))

# 接收数据:

print(s.recv(1024).decode(&＃39;utf-8&＃39;))

s.close()