python-socket

一、UDP

1.1 UDP server

云服务器开放所用端口号

[email protected] == 9001

云服务器eth0（内网IP：192.168.0.61，外网IP：114.115.128.239）
root@hecs-91449:/tmp# ifconfig
eth0: flags=4163  mtu 1500
        inet 192.168.0.61  netmask 255.255.255.0  broadcast 192.168.0.255
        inet6 fe80::f816:3eff:fe25:7cb9  prefixlen 64  scopeid 0x20
        ether fa:16:3e:25:7c:b9  txqueuelen 1000  (Ethernet)
        RX packets 2200793  bytes 831982428 (831.9 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 3093009  bytes 298908455 (298.9 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 789697  bytes 60933682 (60.9 MB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 789697  bytes 60933682 (60.9 MB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

root@hecs-91449:~# cd /tmp/
root@hecs-91449:/tmp# touch udptest.py
root@hecs-91449:/tmp# vim udptest.py 
#脚本内容
import socket
udp_sk = socket.socket(type=socket.SOCK_DGRAM)
udp_sk.bind(('192.168.0.61',9001))
msg, addr = udp_sk.recvfrom(1024)
print(msg.decode('utf-8'))
udp_sk.sendto('hello'.encode('utf-8'),addr)
udp_sk.close()
#运行脚本
root@hecs-91449:/tmp# chmod +x udptest.py 
root@hecs-91449:/tmp# python3 udptest.py 

另启动一个shell，查看进程存在

root@hecs-91449:~# ps -auxw | grep udptest.py
root      547921  0.0  0.1  18572  9596 pts/2    S+   15:27   0:00 python3 udptest.py
root      548029  0.0  0.0   9032   720 pts/3    S+   15:28   0:00 grep --color=auto udptest.py

1.2 UDP client

import socket
ip_port = ('114.115.128.239', 9001)
udp_sk = socket.socket(type=socket.SOCK_DGRAM)
udp_sk.sendto('hello_c'.encode('utf-8'), ip_port)
back_msg, addr = udp_sk.recvfrom(1024)
print(back_msg.decode('utf-8'), addr)
udp_sk.close()

1.3 交互

 

二、TCP

2.1 TCP server

云服务器开放所用端口号

[email protected] == 9002

import socket
tcp_sk = socket.socket()
tcp_sk.bind(('192.168.0.61', 9002))
tcp_sk.listen()
conn, addr = tcp_sk.accept()
print(addr)
conn.send('hello_s'.encode('utf-8'))
ret = conn.recv(1024)
print(ret.decode('utf-8'))
conn.close()
tcp_sk.close()

2.2 TCP client

import socket
tcp_sk = socket.socket()
tcp_sk.connect(('114.115.128.239', 9002))
ret = tcp_sk.recv(1024)
print(ret.decode('utf-8'))
tcp_sk.send('hello_c!'.encode('utf-8'))
tcp_sk.close()

2.3 交互