python网络编程

socket.AF_UNIX unix本机进程间通信

socket.AF_INET IPV4

socket.AF_INET6 IPV6

 

socket.SOCK_STREAM #for tcp

socket.SOCK_DGRAM #for udp

socket.SOCK_RAW #原始套接字

socket.SOCK_RDM #可靠的udp形式

 

一个简单例子：

　　　　

import socket
server = socket.socket()
server.bind(('localhost',6969))
server.listen()
print("开始等电话")
conn,addr = server.accept()
print("电话来了",conn)
data = conn.recv(1024)
print("recv:",data)
conn.send(data.upper())
server.close()

import socket
client=socket.socket()
client.connect(('localhost',6969))
client.send(b"hello world")
data = client.recv(1024)
print("recieve data %s"%data)
client.close()

进一步，通过循环，实现同时接受多个client,顺序接受数据

import socket
server = socket.socket()
server.bind(('localhost',6969))
server.listen(5)
print("开始等电话")
while True:
    conn,addr = server.accept()
    print("电话来了",conn)
    while True:
        data = conn.recv(1024)
        print("recv:",data)
        if not data:
            print("client has lost...")
            break
        conn.send(data.upper())
server.close()

import socket
client=socket.socket()
client.connect(('localhost',6969))
while True:
    msg = input(">>:".strip())
    if len(msg) == 0: continue
    client.send(msg.encode("utf-8"))
    data = client.recv(1024)
    print("recieve data:",data.decode())

client.close()


稍微改一下：

import socket,os
server = socket.socket()
server.bind(('localhost',6969))
server.listen(5)
print("开始等电话")
while True:
    conn,addr = server.accept()
    print("电话来了",conn)
    while True:
        data = conn.recv(1024)
        print("recv:",data)
        if not data:
            print("client has lost...")
            break
        res = os.popen(data.decode('utf-8')).read()
        conn.send(res.encode('utf-8'))
server.close()

import socket
client=socket.socket()
client.connect(('localhost',6969))
while True:
    msg = input(">>:".strip())
    if len(msg) == 0: continue
    client.send(msg.encode("utf-8"))
    data = client.recv(1024)
    print("recieve data:",data.decode())

client.close()


进一步，传输文件：