Python Socket TCP Server/Client 通訊流程

Python Socket TCP Server/Client 通訊流程

源自於https://shengyu7697.github.io/python-tcp-socket/

 # -*- coding: utf-8 -*-

'''

TCP Server 的流程分為以下幾大步驟：

建立socket：s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)，指定 socket.AF_INET (Internet Protocol) family 的通訊協定，類型使用 socket.SOCK_STREAM (Stream Socket) 也就是 TCP 傳輸方式

綁定 socket 到本地 IP 與 port：s.bind()

開始監聽：s.listen()

等待與接受客戶端的請求連線：s.accept()

接收客戶端傳來的資料：s.recv()

傳送給對方發送資料：s.send()、s.sendall()

傳輸完畢後，關閉 socket：s.close()

'''

import socket

HOST = '127.0.0.1'

PORT = 7002

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

s.bind((HOST, PORT))

s.listen(5)

print('server start at: %s:%s' % (HOST, PORT))

print('wait for connection...')

while True:

    conn, addr = s.accept()

    print('connected by ' + str(addr))

    while True:

        indata = conn.recv(1024)

        if len(indata) == 0: # connection closed

            conn.close()

            print('client closed connection.')

            break

        print('recv: ' + indata.decode())

        outdata = 'echo ' + indata.decode()

        conn.send(outdata.encode())

# -*- coding: utf-8 -*-

'''

TCP Client 的流程分為以下幾大步驟：

建立 socket：s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

連線至遠端地址：s.connect()

傳送資料：s.send()、s.sendall()

接收資料：s.recv()

傳輸完畢後，關閉 socket：s.close()

'''

import socket

HOST = '127.0.0.1'

PORT = 7002

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

s.connect((HOST, PORT))

while True:

    outdata = input('please input message: ')

    print('send: ' + outdata)

    s.send(outdata.encode())

    

    indata = s.recv(1024)

    if len(indata) == 0: # connection closed

        s.close()

        print('server closed connection.')

        break

    print('recv: ' + indata.decode())