tcp粘包解决

import socket
import hashlib
import subprocess
import struct

phone = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
phone.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1)   #重用地址
phone.bind(('192.168.20.105',8081))
phone.listen(5)
while 1:
    conn,addr=phone.accept()
    print('线路是%s' % conn)
    print('地址是',addr)
    tag = True
    while 1:
        while tag:
            user = conn.recv(1024).decode('utf-8')
            pwd = conn.recv(1024).decode('utf-8')
            md5_obj = hashlib.md5(user.encode('utf-8'))
            s = pwd+user
            print(s)
            md5_obj.update(s.encode('utf-8'))
            pwd = md5_obj.hexdigest()
            print(pwd)
            if user == 'egon'and pwd=='82bdb4164c14585f32e70ec0a37b3569':
                conn.send('right'.encode('utf-8'))
                tag = False
                break
            else:
                conn.send('用户名或密码错误，请重新输入！'.encode('utf-8'))
        try:
            cmd = conn.recv(1024)
            res = subprocess.Popen(cmd.decode('utf-8'),shell=True,stdout=subprocess.PIPE,stderr=subprocess.PIPE)
            mes = res.stdout.read()
            mesr = res.stderr.read()
            ret = struct.pack('i',(len(mes)+len(mesr)))
            conn.send(ret)
            conn.send(mes)
            conn.send(mesr)
        except Exception:
            break
    conn.close()
phone.close()

import socket
import time
import struct

phone = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
phone.connect(('192.168.20.105',8081))
tag = True
while 1:
    while tag:
        user = input('username:')
        phone.send(user.encode('utf-8'))
        pwd = input('password:')
        phone.send(pwd.encode('utf-8'))
        time.sleep(1)
        mes = phone.recv(1024).decode('utf-8')
        print(mes)
        if mes =='right':
            tag = False
            break
    cmd = input('>>:')
    if not cmd:continue
    phone.send(cmd.encode('utf-8'))
    lens = phone.recv(4)
    lens = struct.unpack('i',lens)
    lens = lens[0]
    mes = phone.recv(1024)
    mes_size = 1024
    while mes_size<lens:
        if lens-mes_size>1024:
            mes+=phone.recv(1024)
        else:
            mes+=phone.recv(lens-mes_size)
        mes_size += 1024
    print(mes.decode('gbk'))

phone.close()