1 #-*- encoding: utf-8 -*-
  2 
  3 class DBMnagement(object):
  4 
  5     '数据库管理类'    
  6 
  7     def __init__(self, nm, pwd):
  8 
  9         self.name = nm
 10 
 11         self.password = pwd        
 12 
 13     def updatePWD(self, newpwd):
 14 
 15         self.password = newpwd
 16 
 17     def __del__(self):
 18 
 19         pass        
 20 
 21 #import os
 22 
 23 import time
 24 
 25 def CreateLog(username):
 26 
 27     '登陆成功写时间戳到log文件'
 28 
 29     timeStamp = time.ctime(time.time())
 30 
 31     log = 'User' + ' - ' + username + ', last time login Succeed at ' + timeStamp + '\n'
 32 
 33     logFile = open('d:\\EX13_4\\userlog.txt', 'a')
 34 
 35     logFile.write(log)
 36 
 37     logFile.close()        
 38 
 39 def ReadLog():
 40 
 41     '登陆成功，从log文件读取上次时间戳'
 42 
 43     logFile = open('d:\\EX13_4\\userlog.txt')
 44 
 45     logInfo = logFile.readlines()
 46 
 47     if len(logInfo) >= 1:
 48 
 49         print logInfo[-1]
 50 
 51     logFile.close()     
 52 
 53 def ChangePWDinLog(username, newpwd):
 54 
 55     '修改用户密码'
 56 
 57     credentialFile = open('d:\\EX13_4\\accounts.txt', 'w') 
 58 
 59     credentialtxt = username + ' ' + newpwd
 60 
 61     credentialFile.write(credentialtxt)
 62 
 63     credentialFile.close()
 64 
 65     print '密码已修改 ... Password updated successfully. \n'
 66 
 67 # 从这里开始是主程序
 68 
 69 print '欢迎使用最简单的用户管理系统'
 70 
 71 print '尝试用系统中已经存在的用户名和密码登录，有三次机会'
 72 
 73 print '登陆成功后输入 updatepwd 命令可以修改密码，成功后退出系统'
 74 
 75 print '登陆成功后输入 quit 命令退出系统\n'
 76 
 77 credentialFile = open('d:\\EX13_4\\accounts.txt') # 从文本文件中获取用户名和密码
 78 
 79 credentialInfo = credentialFile.readlines()
 80 
 81 credentialFile.close()
 82 
 83 usernameinDB = credentialInfo[-1].split()[0] # 这里credentialInfo[-1]是一个字符串，包括用户名和口令，空格隔开的
 84 
 85 passwordindm = credentialInfo[-1].split()[1]
 86 
 87 errorTimes = 3
 88 
 89 while errorTimes:
 90 
 91     print '请输入用户名和密码：'
 92 
 93     input_username = raw_input('Username ... :  ')
 94 
 95     input_password = raw_input('Password ... :  ')
 96 
 97     if input_username == usernameinDB and input_password == passwordindm:
 98 
 99         print '登陆成功  ... Login Successful'
100 
101         CurrentUser = DBMnagement(input_username, input_password)
102 
103         ReadLog()
104 
105         CreateLog(input_username)
106 
107         input_command = raw_input('请输入你的命令, quit or updatepwd ... \n')
108 
109         if input_command == 'quit':
110 
111             del CurrentUser
112 
113             print '\n已退出系统  ... Logout successfully.'
114 
115             break
116 
117         elif input_command == 'updatepwd':
118 
119             newpwd = raw_input('\n请输入新密码, new password ... :  ')
120 
121             CurrentUser.updatePWD(newpwd)
122 
123             ChangePWDinLog(CurrentUser.name, CurrentUser.password)
124 
125             del CurrentUser
126 
127             print '\n已退出系统  ... Logout successfully.'
128 
129             break
130 
131         else:
132 
133             print '错误命令  ... Wrong Command'
134 
135             del CurrentUser
136 
137             print '\n已退出系统  ... Logout successfully.'
138 
139             break
140 
141     else:
142 
143         print '用户名或口令错误  ... Wrong Username or Password.\n'
144 
145         errorTimes -= 1
146 
147         if errorTimes == 0: print '已退出系统  ... Logout successfully.'