python粘包问题及socket套接字编程详解

# TCP 解决粘包问题 附带处理了一下
import socket
import struct
import subprocess
server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server.bind(('127.0.0.1', 8000))
server.listen(5)
print('start...')
# 连接循环
while True:
conn, client_address = server.accept()
print(client_address)
# 通信循环
while True:
try:
cmd = conn.recv(1024)
print(cmd)
pipeline = subprocess.Popen(cmd.decode('utf8'),
shell=True,
stderr=subprocess.PIPE,
stdout=subprocess.PIPE)
stdout = pipeline.stdout.read()
stderr = pipeline.stderr.read()
count_len = len(stdout) + len(stderr)
guding_bytes = struct.pack('i', count_len)
conn.send(guding_bytes) # 4
conn.send(stderr + stdout)
except ConnectionResetError: # 连接循环时出现的中断
break
conn.close()

# 客户端
mport struct
from socket import *
client = socket(AF_INET, SOCK_STREAM)
client.connect(('127.0.0.1', 8000))
while True:
# cmd = input('please enter your cmd you want:')
cmd = 'dir'
client.send(cmd.encode('utf8'))
guding_bytes = client.recv(4)
count_len = struct.unpack('i', guding_bytes)[0]
data = client.recv(count_len)
print(data.decode('gbk'))

# UDP服务端
import socket
server = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
server.bind(('127.0.0.1', 8000))
print('start...')
while True:
data, client_addr = server.recvfrom(1024)
print(client_addr)
print(data)
server.sendto(data.upper(), client_addr)

# UDP客户端
import socket
client = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
while True:
msg = input('please enter your msg:')
client.sendto(msg.encode('utf8'), ('127.0.0.1', 8000))
data = client.recvfrom(1024)
print(data)

# 同一时刻有多个人在接听
import socketserver
import subprocess 
import struct
class MyHandler(socketserver.BaseRequestHandler):
# 通信循环
def handle(self):
while True:
try:
cmd = self.request.recv(1024)
print(cmd)
pipeline = subprocess.Popen(cmd.decode('utf8'),
shell = True,
stderr = subprocess.PIPE,
stdout = subprocess.PIPE)
stdout = pipeline.stdout.read()
stderr = pipeline.stderr.read()
count_len = len(stderr) + len(stdout)
guding_bytes = struct.pack('i', count_len)
self.request.send(guding_bytes) # 4
self.request.send(stderr + stdout)
except ConnectionResetError:
break
# 使用socketserver的连接循环(并发),但是使用了自己的通信循环
# myhandler = MyHandler()
if __name__ == '__main__':
server = socketserver.ThreadingTCPServer(('127.0.0.1', 8000), MyHandler, bind_and_activate=True)
print('start...')
server.serve_forever()