python前后台tcp/udp通讯示例

以下代码兼容python2.7+、python3

TCP示例

服务器 -- sever_tcp.py

#!/usr/bin/env python
#coding=utf-8

import time
import socket
import threading

local_addr = ('127.0.0.1',8888)
buff_len = 1024

def conn_proc(sock, addr):

    print('accept new connection from %s:%s...' % addr)
    # 发送数据给客户端
    sock.send('welcome'.encode('utf-8'))

    while True:

        print('wating for message...')
        # 阻塞接收客户端数据
        date = sock.recv(buff_len)
        if not date or date.decode('utf-8')=='exit':
            break 
        print(date.decode('utf-8')) 

        time.sleep(1.5)
        sock.send(('server '+str(time.time())).encode('utf-8'))

    sock.close()
    print('close connection %s:%s' % addr)

if __name__ == '__main__':

    # 创建一个socket
    tcp = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    # 绑定监听的地址和端口
    tcp.bind(local_addr)
    # 开始监听端口，等待连接的最大数量为10
    tcp.listen(10)

    while True:
        # 阻塞等待客户端过来的tcp连接
        sock,addr = tcp.accept()
        # 创建一个新线程来处理TCP连接
        threading.Thread(target=conn_proc,args=(sock,addr)).start()

    # 关闭socket   
    tcp.close()

打印log如下：

accept new connection from 127.0.0.1:51241...
wating for message...
hello server.1563353570.55
wating for message...
1563353572.05

客户端 -- client_tcp.py 

#!/usr/bin/env python
#coding=utf-8

import time
import socket

server_addr = ('127.0.0.1',8888)
buff_len = 1024

if __name__ == '__main__':

    # 创建一个socket
    tcp = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
    # 建立连接
    tcp.connect(server_addr)

    # 发送数据给服务器
    tcp.send('hello server.'.encode('utf-8'))
    # 阻塞接收服务器数据
    print(tcp.recv(buff_len).decode('utf-8'))

    while True:
        tcp.send(str(time.time()).encode('utf-8'))
        date = tcp.recv(buff_len)
        if not date or date.decode('utf-8')=='exit':
            break 
        print(date.decode('utf-8'))
    
    # 关闭socket
    tcp.close()

打印log如下： 

welcome
server 1563353572.051841

UDP示例

服务端  -- server_udp.py

#!/usr/bin/env python
#coding=utf-8

import time
import socket

local_addr = ('127.0.0.1',8888)
buff_len = 1024

if __name__ == '__main__':

    # 创建一个socket
    udp = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    # 绑定监听的地址和端口
    udp.bind(local_addr)
    
    while True:

        print('wating for message...')
        # 阻塞接收客户端数据
        data, addr = udp.recvfrom(buff_len)
        print('received from %s data:%s' % (addr, data.decode('utf-8')))

        time.sleep(1.5)
        # 发送数据给客户端
        udp.sendto(('server '+str(time.time())).encode('utf-8'), addr)

    # 关闭socket  
    udp.close()

打印log如下：  

wating for message...
received from ('127.0.0.1', 51264) data:hello server.
wating for message...
received from ('127.0.0.1', 51264) data:1563353804.57
wating for message...
received from ('127.0.0.1', 51264) data:1563353806.07

客户端  -- client_udp.py

#!/usr/bin/env python
#coding=utf-8

import time
import socket

server_addr = ('127.0.0.1',8888)
buff_len = 1024

if __name__ == '__main__':

    # 创建一个socket
    udp = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)

    # 发送数据给服务器
    udp.sendto('hello server.'.encode('utf-8'), server_addr)
    # 阻塞接收服务器数据
    print(udp.recv(buff_len).decode('utf-8'))

    while True:
        udp.sendto(str(time.time()).encode('utf-8'),server_addr)
        print(udp.recv(buff_len).decode('utf-8'))

    # 关闭socket
    udp.close()

打印log如下： 

server 1563353804.56509
server 1563353806.0682404

如果udp连接不通或收发数据延迟，解决办法有2个：

1. 直接关闭防火墙

2. disable防火墙中阻止udp的策略规则，并允许python.exe通过防火墙

在windows上，若想让python隐藏窗口，可在程序启动后，插入如下代码：

import ctypes
 
main_wnd = ctypes.windll.kernel32.GetConsoleWindow()    
if main_wnd != 0:    
    ctypes.windll.user32.ShowWindow(main_wnd, 0)    
    ctypes.windll.kernel32.CloseHandle(main_wnd)