Python简单服务器程序

这是《Python核心编程（中的文第二版）》的一个习题，题目要求服务器能识别以下命令：

ls 返回服务器程序当前目录

os 返回服务器操作系统的信息

date 得到服务器当前的时间

ls dir 返回目录dir的文件列表

服务器程序：

 1 import time
 2 import os
 3 import datetime
 4
 5 HOST=‘‘
 6 PORT=21234
 7 ADDR=(HOST,PORT)
 8 BUFSIZE=8096
 9
10 SerSock=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
11 SerSock.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1)
12 SerSock.bind(ADDR)
13 SerSock.listen(5)
14
15 def process_cmd(cmd):
16     print "The command receive from client is:%s"%cmd
17     if cmd==‘ls‘:
18         curdir=os.curdir
19         res=os.listdir(curdir)
20     elif cmd==‘os‘:
21         res=os.uname()
22     elif cmd.startswith(‘ls‘):
23         length=len(cmd.split())
24         if length==1:
25             res="command is illegal"
26         elif length==2:
27             reqdir=cmd.split()[1]
28             try:
29                 res=os.listdir(reqdir)
30             except OSError,e:
31                 res=e
32         else:
33             res="argument is illegal"
34     elif cmd==‘date‘:
35         res=datetime.date.today()
36     else:
37         res=‘command is illegal‘
38     print res
39     return str(res)
40 while True:
41     CliSock,addr=SerSock.accept()
42     print "...connected from %s:%s"%addr
43     while True:
44         cmd=CliSock.recv(BUFSIZE)
45         if not cmd:
46             break
47         else:
48             res=process_cmd(cmd)
49         CliSock.send(res)
50     CliSock.close()
51 SerSock.close()

客户端程序：

 1 #!/usr/bin/python
 2
 3 import socket
 4
 5 HOST=‘localhost‘
 6 PORT=21234
 7 ADDR=(HOST,PORT)
 8 BUFSIZ=8096
 9
10 CliSock=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
11 CliSock.connect(ADDR)
12 print "Please input below command."
13 print "*************************************"
14 print "date   ls/ls dir     os"
15 print "*************************************"
16 while True:
17     cmd=raw_input(">")
18     if not cmd:
19         continue
20     CliSock.send(cmd)
21     res=CliSock.recv(BUFSIZ)
22     if not res:
23         print "response from server error."
24     print res
25
26 CliSock.close()

执行结果：

Please input below command.
*************************************
date   ls/ls dir     os
*************************************
>date
2015-06-09
>ls
[‘client_select.py‘, ‘client.py‘, ‘server_select.py‘, ‘chat_server_v1.py‘, ‘server.py‘, ‘daytimeclient.py‘, ‘chat_client_v1.py‘, ‘chat_server_v2.py‘, ‘tsTserv.py‘, ‘tsTclnt.py‘]
>ls /home
[‘tmyyss‘]
>os
(‘Linux‘, ‘ubuntu‘, ‘3.13.0-53-generic‘, ‘#89-Ubuntu SMP Wed May 20 10:34:28 UTC 2015‘, ‘i686‘)
>
>
>
>
>exit
command is illegal
>
>
>q
command is illegal