2、tcp/udp解决粘包

tcp解决粘包，远程控制

tcp客户端

from socket import *
import struct
import json

client = socket(AF_INET,SOCK_STREAM)
client.connect(('127.0.0.1',8080))

while True:
cmd = input('请输入你的命令❤:').strip()
if len(cmd) == 0:
continue
client.send(cmd.encode('utf-8'))

header_bytes_len = struct.unpack('i',client.recv(4))[0]

header_bytes = client.recv(header_bytes_len)
header_json = header_bytes.decode('utf-8')
header_dic = json.loads(header_json)

print(header_dic)
total_size = header_dic['total_size']

recv_size = 0
res = b''
while recv_size < total_size:
data = client.recv(1024)
recv_size += len(data)
res += data
print(res.decode('gbk'))

tcp服务端

from socket import *
from subprocess import Popen,PIPE
import struct
import json

server = socket(AF_INET,SOCK_STREAM)
server.bind(('127.0.0.1',8080))
server.listen(5)

while True:
conn,client_addr = server.accept()
while True:
try:
cmd = conn.recv(8096)
if len(cmd) == 0: break
obj = Popen(cmd.decode('utf-8'),
shell = True,
stderr= PIPE,
stdout= PIPE,
)
res1 = obj.stdout.read()
res2 = obj.stderr.read()

header_dic = {
'filename': 'a.txt',
'total_size': len(res1)+len(res2),
'md5': '天王盖地虎'
}

header_json = json.dumps(header_dic)
header_bytes = header_json.encode('utf-8')
conn.send(struct.pack('i',len(header_bytes)))
conn.send(header_bytes)

conn.send(res1)
conn.send(res2)
except Exception:
break
conn.close()

udp 简单的多并发

服务端

from socket import *

server= socket(AF_INET,SOCK_DGRAM)
server.bind(('127.0.0.1',9999))

while True:

data,client_addr = server.recvfrom(1024)
print(data.decode('gbk'))
server.sendto(data.upper(),client_addr)

客户端1

from socket import *

client = socket(AF_INET,SOCK_DGRAM)

while True:
data = input('>>>>>>>:').strip()
client.sendto(data.encode('utf-8'),('127.0.0.1',9999))
res,server_addr = client.recvfrom(1024)
print(res.decode('utf-8'))

客户端2

from socket import *

client = socket(AF_INET,SOCK_DGRAM)

while True:
data = input('>>>>>>>:').strip()
client.sendto(data.encode('utf-8'),('127.0.0.1',9999))
res,server_addr = client.recvfrom(1024)
print(res.decode('utf-8'))