python--FTP的实现（用socketserver）
1、要求
和上一篇FTP的实现（用socket）的要求一样，只是老师要求用socketserver来实现
2、思路
socketserver来实现的话，
（1）需要定义一个自己的handler类，该类继承于socketserver.BaseRequestHandler，然后重写父类的handle方法，在这个方法中实现具体的要求，就是原来用socket实现的server的功能，根据client的请求分别做出相应的动作。
（2）将主机、端口、自己的handler类作为参数，建立socketserver.TCPServer对象，然后serve_forever()
（3）其他代码都不变，参见上一篇用socket实现的FTP
1 import socketserver 2 import socket 3 import os 4 5 host='localhost' 6 port=21 7 8 class MyFtpServerHandler(socketserver.BaseRequestHandler): 9 def handle(self): 10 # 从文件获取用户名密码，放在字典里 11 userinfo = {} 12 fddir = os.path.dirname(os.path.dirname(__file__)) # project根目录 13 homedir = fddir + '\homedir' 14 15 with open(r'%s\userinfo\userinfo' % fddir, 'r', encoding='utf-8') as userfd: 16 line = userfd.readline() 17 while line: 18 name = line.split()[0] 19 passwd = line.split()[1] 20 userinfo[name] = passwd 21 line = userfd.readline() 22 23 # 等待接收数据 24 while True: 25 print("server waiting...") 26 27 while True: 28 clientdata = self.request.recv(1024) # 1M data 29 clientdatastr = clientdata.decode('utf-8') 30 ''' 31 分辨传进来的是什么命令做相应的处理 32 1、登录命令以loginstring开头--验证用户名密码是否正确 33 2、退出是exit或quit--关闭conn，退出接受命令的状态 34 3、其他 35 ''' 36 if clientdatastr.startswith('loginstring'): 37 strlist = clientdatastr.split() 38 namein = strlist[1] 39 passin = strlist[2] 40 if namein in userinfo.keys() and userinfo[namein] == passin: 41 os.chdir('%s\homedir\%s' % (fddir, namein)) 42 self.request.send(b'login success...') 43 else: 44 self.request.send(b'user name and password wrong......') 45 self.request.close() 46 break 47 elif clientdatastr == 'exit' or clientdatastr == 'quit': 48 self.request.close() 49 break 50 elif clientdatastr == 'currentdir': 51 curdir = os.getcwd() 52 self.request.send(curdir.encode('utf-8')) 53 elif clientdatastr == 'currentfiles': 54 curdir = os.getcwd() 55 returnstr = '' 56 for root, dirs, files in os.walk(curdir): 57 returnstr += 'rootdir:' + root + '\n' 58 for d in dirs: 59 returnstr += 'directory:' + d + '\n' 60 for f in files: 61 returnstr += 'file:' + f + '\n' 62 print(returnstr) 63 self.request.send(returnstr.encode('utf-8')) 64 elif clientdatastr.startswith('downdir'): 65 strlist = clientdatastr.split() 66 dirname = strlist[1] 67 targetdir = os.getcwd() + '\\' + dirname 68 os.chdir(targetdir) 69 curdir = os.getcwd() 70 self.request.send(curdir.encode('utf-8')) 71 elif clientdatastr == 'updir': 72 fatherdir = os.path.dirname(os.getcwd()) 73 os.chdir(fatherdir) 74 curdir = os.getcwd() 75 self.request.send(curdir.encode('utf-8')) 76 elif clientdatastr.startswith('download'): 77 strlist = clientdatastr.split() 78 filename = strlist[1] 79 dirname = os.path.join(os.getcwd(), filename) 80 with open(dirname, 'r') as fd: 81 msg = fd.read() 82 self.request.send(msg) 83 elif clientdatastr.startswith('upload'): 84 strlist = clientdatastr.split() 85 filename = strlist[1] 86 filecont = strlist[2] 87 dir = os.path.join(os.getcwd(), filename) 88 with open(filename, 'w') as fd: 89 fd.write(filecont) 90 self.request.send('***') 91 else: 92 cmdstr = clientdatastr.strip() 93 print(cmdstr) 94 result = os.popen(cmdstr) 95 print(result.read()) 96 self.request.send(result.read().encode('utf-8')) 97 return 98 99 with socketserver.TCPServer((host,port),MyFtpServerHandler) as ftpserver: 100 ftpserver.serve_forever()
