Python Socket多线程并发

1.SocketServer模块编写的TCP服务器端代码

　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 = 50007
s = 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 socketserver
import struct
import json
import os
class 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 socket
import struct
import json
import os

class 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()