一、基於TCP協議的socket通訊

以打電話為理解方式進行TCP的通訊。
Server端程式碼：
import socket
phone = socket.socket(socket.AF_INET, socket.SOCK_STREAM)     #購買電話卡，AF_INET伺服器之間網路通訊，socket.SOCK_STREAM，流式協議，就是TCP協議
phone.bind(('127.0.0.1', 8080))                               #選擇電話號碼，繫結IP地址
phone.listen(5)                                               #開機，監控5個請求，最多能進入6個，第7個會報錯
conn, addr 
 
= phone.accept()                                   #等待接聽電話，阻塞狀態，獲取IP和埠
print(conn, addr)                                             #列印IP和埠
client_data = conn.recv(1024)                                 #交流過程
print(client_data)                                            #列印接收到的資料
conn.send(client_data.upper())                                #接收到的英文字母變成大寫並回傳資料
conn.close()
phone.close()

Client端程式碼：
 
import socket
phone = socket.socket()
phone.connect(('127.0.0.1', 8080))
msg = input('>>>').strip()
phone.send(msg.encode('utf-8'))
server_data = phone.recv(1024)                                #限制最大接收位元組
print(server_data)
phone.close()

先執行Server端，再執行Client端，輸入：Others laugh at me for being mad. I laugh at others for not being able to see through.
 

------------------------------------Client端執行結果---------------------------------------
>>>Others laugh at me for being mad. I laugh at others for not being able to see through.
b'OTHERS LAUGH AT ME FOR BEING MAD. I LAUGH AT OTHERS FOR NOT BEING ABLE TO SEE THROUGH.'
------------------------------------------------------------------------------------------

------------------------------------Server端執行結果----------------------------------------
<socket.socket fd=244, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=('127.0.0.1', 8080), raddr=('127.0.0.1', 64096)> ('127.0.0.1', 64096)
b'Others laugh at me for being mad. I laugh at others for not being able to see through.'
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 二、單迴圈模式

Server端程式碼：
import socket
phone = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  #使用TCP協議建立網路通訊
phone.bind(('127.0.0.1', 8080))                            #繫結IP地址和埠
phone.listen(5)                                            #設定最大連線數，但是同一時間只能處理一個請求while 1:                                                   #使服務端能夠一直接受資料
    conn, addr = phone.accept()                            #獲取連線到伺服器的IP和埠
    try:
        client_data = conn.recv(1024)                      #接收1024位元組的資料
        print(client_data)                                 #列印資料（數字為bytes型別）
        conn.send(client_data + b'-yes-')                  #源資料加上-yes-並返回給客戶端
    except Exception:
        break
conn.close()
phone.close()


Client端程式碼：
import socket
phone = socket.socket()
phone.connect(('127.0.0.1', 8080))

while 1:
    msg = input('>>>').strip()                             #可輸入要傳輸的字元
    if msg.upper() == 'Q':                                 #如果輸出q則退出
        break
    elif not msg:                                          #如果msg接到到的內容為空，則結束本次迴圈
        continue
    phone.send(msg.encode('utf-8'))                        #使用utf-8的編碼進行傳送資料
    server_data = phone.recv(1024)                         #最多隻能接受1024位元組，只問題會產生粘包
    print(server_data.decode('utf-8'))                     #列印解碼後的資料
phone.close()

------------------------------------Client端執行結果---------------------------------------
>>>laugh                                                   #輸入要傳到S端的內容
laugh-yes-                                                 #打印出來的是S端返回的內容
>>>crazy
crazy-yes-
>>>q

Process finished with exit code 0
-------------------------------------------------------------------------------------------

------------------------------------Server端執行結果----------------------------------------

b'laugh'                                                   #收到C端傳送來的內容
b'crazy' 

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 三、遠端執行命令