import socket,os

server=socket.socket()

server.bind(('localhost',9999))

server.listen()

while True:

    conn,addr=server.accept()

    print("new conn:",addr)

    while True:

        data=conn.recv(1024)

        if not data:

            print("客户端已断，请重新输入")

            break

        cmd_res=os.popen(data.decode('utf-8')).read()

        if len(cmd_res)==0:

            cmd_res='无效命令，没有返回值'

        conn.send(cmd_res.encode('utf-8'))

server.close()

import socket

client=socket.socket()

client.connect(('localhost',9999))

while True:

    cmd=input(">>:").strip()

    if len(cmd)==0:

        continue

    client.send(cmd.encode('utf-8'))

    cmd_res=client.recv(1024)

    print(cmd_res.decode('utf-8'))

client.close()

new conn: ('127.0.0.1', 61966)

'pwd' is not recognized as an internal or external command,

operable program or batch file.

>>:pwd

无效命令，没有返回值

>>:dir

 Volume in drive C is OSDisk

 Volume Serial Number is 002E-D604

 Directory of C:\abccdxddd\Oldboy\Py_Exercise\Day8

08/07/2017  03:54 PM    <DIR>          .

08/07/2017  03:54 PM    <DIR>          ..

08/07/2017  03:52 PM               280 client_ch.py

08/07/2017  03:54 PM               509 server_ch.py

08/03/2017  11:17 AM               650 socket_ssh_server.py

08/03/2017  11:26 AM               259 sock_ssh_client.py

08/03/2017  03:56 PM               133 ssh_client.py

08/03/2017  03:54 PM               415 ssh_server.py

08/03/2017  04:55 PM               259 ????.py

08/07/2017  10:27 AM               146 ????.py

               8 File(s)          2,651 bytes

               2 Dir(s)  145,735,159,808 bytes free

import socket,os

server=socket.socket()

server.bind(('localhost',9999))

server.listen()

while True:

    conn,addr=server.accept()

    print("new connection is :",addr)

    while True:

        data=conn.recv(1024)

        if not data:

            print("客户端已经断开")

            break

        cmd_res=os.popen(data.decode('utf-8')).read()

        if len(cmd_res)==0:

            cmd_res="命令无效，没有返回值"

        conn.send(str(len(cmd_res)).encode('utf-8'))

        #整数不能直接encode，需要先转成字符串，再encode.发大小给客户端

        conn.send(cmd_res.encode('utf-8'))

server.close()

import socket

client=socket.socket()

client.connect(('localhost',9999))

while True:

    cmd=input(">>:").strip()

    if len(cmd)==0:

        break

    client.send(cmd.encode('utf-8'))

    cmd_res_size=client.recv(1024) #接收命令结果的长度。

    print("命令结果大小：",cmd_res_size)

    received_size=0

    received_data=b""

    while received_size<int(cmd_res_size.decode("utf-8")):

        data=client.recv(1024)

        received_size=received_size+len(data) #每次收到的有效数字，有可能小于1024

        received_data=received_data+data

    else:

        print("cmd res received done...",received_size)

        print(received_data.decode('utf-8'))

client.close()

import socket,os

server=socket.socket()

server.bind(('localhost',9999))

server.listen()

while True:

    conn,addr=server.accept()

    print("new connection is :",addr)

    while True:

        data=conn.recv(1024)

        if not data:

            print("客户端已经断开")

            break

        cmd_res=os.popen(data.decode('utf-8')).read()

        if len(cmd_res)==0:

            cmd_res="命令无效，没有返回值"

        conn.send(str(len(cmd_res.encode())).encode('utf-8'))

        #整数不能直接encode，需要先转成字符串，再encode.发大小给客户端

        conn.send(cmd_res.encode('utf-8'))

server.close()

import socket

client=socket.socket()

client.connect(('localhost',9999))

while True:

    cmd=input(">>:").strip()

    if len(cmd)==0:

        break

    client.send(cmd.encode('utf-8'))

    cmd_res_size=client.recv(1024) #接收命令结果的长度。

    print("命令结果大小：",cmd_res_size)

    received_size=0

    received_data=b""

    while received_size<int(cmd_res_size.decode("utf-8")):

        data=client.recv(1024)

        received_size=received_size+len(data) #每次收到的有效数字，有可能小于1024

        received_data=received_data+data

    else:

        print("cmd res received done...",received_size)

        print(received_data.decode('utf-8'))

client.close()

aa="人"

print(len(aa))

print(len(aa.encode('utf-8')))

1

3