struct模块解决黏包问题

client端执行命令

import socket
import subprocess
import struct

sk = socket.socket()
sk.connect(('127.0.0.1',8080))
while True:
    cmd = sk.recv(1024).decode('gbk')
    if cmd =='q':
        break
    res = subprocess.Popen(cmd,shell=True,
                     stdout=subprocess.PIPE,
                     stderr=subprocess.PIPE)

    stdout = res.stdout.read()
    stderr = res.stderr.read()
    length = len(stdout)+len(stderr)
    num_bytes = struct.pack('i',length)
    sk.send(num_bytes)
    sk.send(stdout)
    sk.send(stderr)
sk.close()

server端发送命令

import socket
import struct
sk = socket.socket()
sk.bind(('127.0.0.1',8080))
sk.listen()
conn,addr = sk.accept()
while True:
    cmd = input('>>>')
    if cmd == 'q':
        conn.send(b'q')
        break
    conn.send(cmd.encode('gbk'))
    num = conn.recv(4)
    num = struct.unpack('i',num)[0]
    res = conn.recv(int(num)).decode('gbk')
    print(res)

conn.close()
sk.close()