一、socket

　　socket即套接字，用於描述IP地址和埠，是一個通訊鏈的控制代碼，應用程式通常通過"套接字"向網路發出請求或者應答網路請求。

　　最簡單的socket，一次

 1 import socket
 2 server = socket.socket() #獲得例項
 3 server.bind(("localhost",9999)) #繫結主機和埠以元組形式
 4 server.listen() #監聽
 5 print("等待客戶端連線。。")
 6 conn,addr = server.accept() #接收連線
 7 data = conn.recv(1024) #
 
接收資料，預設最大為8192
 8 print("收到：",data.decode()) #data是byte格式要decode一下
 9 conn.send("不要回答！不要回答！不要回答！".encode())#傳送的資料要是byte格式
10 server.close()

1 import socket
2 client = socket.socket()
3 client.connect(("localhost",9999))
4 client.send("請佔領地球！".encode("utf-8"))
5 data = client.recv(1024)
 
6 print("反饋：",data.decode())
7 client.close()

　　實現多次互動，多連線處理，加兩個迴圈

 1 import socket
 2 server = socket.socket()
 3 server.bind(("localhost",9999))
 4 server.listen()
 5 while True: #第一層迴圈
 6     print("等待客戶端連線。。")
 7     conn,addr = server.accept()
 8     while True: #第二層迴圈
 

 9         data = conn.recv(1024)
10         if not data: #如果沒有資料就斷開
11             print("客戶端斷開。")
12             break
13         print("收到：",data.decode())
14         conn.send("不要回答！不要回答！不要回答！".encode())
15 server.close()

 1 import socket
 2 client = socket.socket()
 3 client.connect(("localhost",9999))
 4 while True:
 5     msg = input(">>:").strip()
 6     if len(msg) == 0:continue
 7     client.send(msg.encode("utf-8"))
 8     data = client.recv(1024)
 9     print("反饋：",data.decode())
10 client.close()

　　防止黏包在兩次send之間要加個客戶端響應

1 conn.send(str(len(res)).encode())
2 client_ack = conn.recv(1024)
3 conn.sendall(res)

二、socketserver

 1 import socketserver
 2  
 3 class MyTCPHandler(socketserver.BaseRequestHandler):
 4     """
 5     The request handler class for our server.
 6     It is instantiated once per connection to the server, and must
 7     override the handle() method to implement communication to the client.
 8     """
 9  
10     def handle(self):
11         # self.request is the TCP socket connected to the client
12         self.data = self.request.recv(1024).strip()
13         print("{} wrote:".format(self.client_address[0]))
14         print(self.data)
15         # just send back the same data, but upper-cased
16         self.request.sendall(self.data())
17  
18 if __name__ == "__main__":
19     HOST, PORT = "localhost", 9999
20  
21     # Create the server, binding to localhost on port 9999
22     server = socketserver.TCPServer((HOST, PORT), MyTCPHandler)          
23     #server = socketserver.ThreadingTCPServer((HOST, PORT), MyTCPHandler) #多併發
24     # Activate the server; this will keep running until you
25     # interrupt the program with Ctrl-C
26     server.serve_forever()