Python Socket多线程并发原理及实现

　Socketserver原理图

服务端：

import SocketServer #导入SocketServer，多线程并发由此类实现 class MySockServer(SocketServer.BaseRequestHandler): #定义一个类 def handle(self): #handle(self)方法是必须要定义的，可以看上面的说明 print ’Got a new connection from’, self.client_address while True: data = self.request.recv(1024) #需要通过self的方法调用数据接收函数 if not data:break print ’recv:’, data self.request.send(data.upper()) #需要通过self的方法调用数据接收函数 if __name__ == ’__main__’: #并非一定要用这样的方式，只是建议这样使用 HOST = ’’ #定义侦听本地地址口（多个IP地址情况下），这里表示侦听所有 PORT = 50007 #Server端开放的服务端口 s = SocketServer.ThreadingTCPServer((HOST, PORT), MySockServer) #调用SocketServer模块的多线程并发函数 s.serve_forever() #持续接受客户端的连接

客户端：

import socket HOST = ’192.168.1.13’PORT = 50007s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)s.connect((HOST, PORT)) while True: user_input = raw_input(’msg to send:’).strip() s.sendall(user_input) data = s.recv(1024) print ’Received’, repr(data) s.close() 2.基于Python Socketserver的实现的FTP程序

　服务端：

import socketserverimport structimport jsonimport osclass FtpServer(socketserver.BaseRequestHandler): coding=’utf-8’ server_dir=’file_upload’ max_packet_size=1024 BASE_DIR=os.path.dirname(os.path.abspath(__file__)) def handle(self): print(self.request) while True: data=self.request.recv(4) data_len=struct.unpack(’i’,data)[0] head_json=self.request.recv(data_len).decode(self.coding) head_dic=json.loads(head_json) # print(head_dic) cmd=head_dic[’cmd’] if hasattr(self,cmd):func=getattr(self,cmd)func(head_dic) def put(self,args): file_path = os.path.normpath(os.path.join( self.BASE_DIR, self.server_dir, args[’filename’] )) filesize = args[’filesize’] recv_size = 0 print(’----->’, file_path) with open(file_path, ’wb’) as f: while recv_size < filesize:recv_data = self.request.recv(self.max_packet_size)f.write(recv_data)recv_size += len(recv_data)print(’recvsize:%s filesize:%s’ % (recv_size, filesize))ftpserver=socketserver.ThreadingTCPServer((’127.0.0.1’,8080),FtpServer)ftpserver.serve_forever()

　客户端：

import socketimport structimport jsonimport osclass MYTCPClient: address_family = socket.AF_INET socket_type = socket.SOCK_STREAM allow_reuse_address = False max_packet_size = 8192 coding=’utf-8’ request_queue_size = 5 def __init__(self, server_address, connect=True): self.server_address=server_address self.socket = socket.socket(self.address_family, self.socket_type) if connect: try:self.client_connect() except:self.client_close()raise def client_connect(self): self.socket.connect(self.server_address) def client_close(self): self.socket.close() def run(self): while True: inp=input('>>: ').strip() if not inp:continue l=inp.split() cmd=l[0] if hasattr(self,cmd):func=getattr(self,cmd)func(l) def put(self,args): cmd=args[0] filename=args[1] if not os.path.isfile(filename): print(’file:%s is not exists’ %filename) return else: filesize=os.path.getsize(filename) head_dic={’cmd’:cmd,’filename’:os.path.basename(filename),’filesize’:filesize} print(head_dic) head_json=json.dumps(head_dic) head_json_bytes=bytes(head_json,encoding=self.coding) head_struct=struct.pack(’i’,len(head_json_bytes)) self.socket.send(head_struct) self.socket.send(head_json_bytes) send_size=0 with open(filename,’rb’) as f: for line in f:self.socket.send(line)send_size+=len(line)print(send_size) else:print(’upload successful’)client=MYTCPClient((’127.0.0.1’,8080))client.run()

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