粘包问题解决方案

粘包解决方案：

思路：服务端传输数据前 提前 告知客户端传输数据的大小

客户端

import  socket
import struct

client = socket.socket(socket.AF_INET,socket.SOCK_STREAM)

addr = ('127.0.0.1',8000)

client.connect(addr)

while True:
    # 发送消息
    msg = input("请输入你要讲的话>>>>")
    client.send(bytes(msg.encode('utf8')))

    # 接受消息
    leng = client.recv(4)		# 提前接受客户端传输数据的大小
    date_lens = struct.unpack('i',leng)[0]	# 转化
    data = client.recv(date_lens)		# data_lens为服务端即将发来数据的大小
    print(data.decode('gbk'))

服务端

import  socket
import struct
import subprocess

service =  socket.socket(socket.AF_INET,socket.SOCK_STREAM)
addr = ('127.0.0.1',8000)
service.bind(addr)
service.listen(5)
conn,addr = service.accept()

while True:
    # 接受消息
    client_msg = conn.recv(1024)
    print(client_msg)
    common = client_msg.decode('utf8')
    print(common)
    obj = subprocess.Popen(common,
                     shell=True,
                     stderr=subprocess.PIPE,
                     stdout = subprocess.PIPE
                     )

    stderr = obj.stderr.read()
    stdout = obj.stdout.read()

    msg_len = len(stderr) + len(stdout)	# 传输数据的长度
    one = struct.pack('i',msg_len)		# 转化

    conn.send(one)		# 告知client端 本次传入数据的大小
    conn.send(stdout+stderr)

使用UDP进行传输数据

客户端

import  socket

client = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)

addr = ('127.0.0.1',8000)
msg = input("请输入你的内容>>>>")
client.sendto(bytes(msg.encode('utf8')),addr)	# 传输到服务端

data,addr = client.recvfrom(1024)		# 接受消息
print(data.decode('utf8'))

服务端

import socket
service = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
addr = ('127.0.0.1',8000)
service.bind(addr)

date,addr = service.recvfrom(1024)	# 接受消息
print(date.decode('utf8'))

service.sendto(date.upper(),addr)	# 发送消息