Python UDP实例

import socket
BUFSIZE = 1024
ip_port = (‘127.0.0.1‘, 9999)
server = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)  # udp协议
server.bind(ip_port)
while True:
    data,client_addr = server.recvfrom(BUFSIZE)
    print(‘server收到的数据‘, data)

    server.sendto(data.upper(),client_addr)

server.close()

import socket
BUFSIZE = 1024
client = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
while True:
    msg = input(">> ").strip()
    ip_port = (‘127.0.0.1‘, 9999)
    client.sendto(msg.encode(‘utf-8‘),ip_port)

    data,server_addr = client.recvfrom(BUFSIZE)
    print(‘客户端recvfrom ‘,data,server_addr)

client.close()

server:

server收到的数据 b‘hello‘
server收到的数据 b‘world‘


client:
>> hello
客户端recvfrom  b‘HELLO‘ (‘127.0.0.1‘, 9999)
>> world
客户端recvfrom  b‘WORLD‘ (‘127.0.0.1‘, 9999)
>> 

from socket import *
import time
server=socket(AF_INET,SOCK_DGRAM)
server.bind((‘127.0.0.1‘,8880))


res1=server.recvfrom(10) #b‘hello‘
print(‘第一次：‘,res1)

res2=server.recvfrom(1024) #b‘world‘
print(‘第二次：‘,res2)


server.close()

from socket import *
import time
client = socket(AF_INET, SOCK_DGRAM)


client.sendto(b‘hello‘,(‘127.0.0.1‘,8880))

client.sendto(b‘world‘,(‘127.0.0.1‘,8880))

client.close()

server：


from socket import *
import time
server=socket(AF_INET,SOCK_DGRAM)
server.bind((‘127.0.0.1‘,8880))


res1=server.recvfrom(2) #b‘he‘
print(‘第一次：‘,res1)
time.sleep(6)
res2=server.recvfrom(1024) #b‘world‘
print(‘第二次：‘,res2)


server.close()


client：

from socket import *
import time
client = socket(AF_INET, SOCK_DGRAM)


client.sendto(b‘hello‘,(‘127.0.0.1‘,8880))
time.sleep(5)
client.sendto(b‘world‘,(‘127.0.0.1‘,8880))

client.close()　　

windows直接报错：
Traceback (most recent call last):
/路飞/第三模块/第二章网络编程/06 基于udp协议的套接字/服务端.py", line 24, in <module>
    res1=server.recvfrom(2) #b‘he‘
OSError: [WinError 10040] 一个在数据报套接字上发送的消息大于内部消息缓冲区或其他一些网络限制，或该用户用于接收数据报的缓冲区比数据报小。


mac或linux：
直接丢包，只收到b‘he‘，后面的llo不会收到