如何在python中从客户端向服务器发送消息

Question

我正在阅读Python 2.7.10中的两个带有客户端和服务器的程序.如何修改这些程序以便从客户端向服务器发送消息？

server.py:

#!/usr/bin/python           # This is server.py file

import socket               # Import socket module

s = socket.socket()         # Create a socket object
host = socket.gethostname() # Get local machine name
port = 12345                # Reserve a port for your service.
s.bind((host, port))        # Bind to the port

s.listen(5)                 # Now wait for client connection.
while True:
   c, addr = s.accept()     # Establish connection with client.
   print 'Got connection from', addr
   c.send('Thank you for connecting')
   c.close()                # Close the connection

client.py:

#!/usr/bin/python           # This is client.py file

import socket               # Import socket module

s = socket.socket()         # Create a socket object
host = socket.gethostname() # Get local machine name
port = 80              # Reserve a port for your service.

s.connect((host, port))
print s.recv(1024)
s.close                     # Close the socket when done

Answer 1

TCP套接字是双向的.因此,在连接之后,服务器和客户端之间没有区别,您只有一个流的两端:

import socket               # Import socket module

s = socket.socket()         # Create a socket object
s.bind(('0.0.0.0', 12345))        # Bind to the port

s.listen(5)                 # Now wait for client connection.
while True:
   c, addr = s.accept()     # Establish connection with client.
   print 'Got connection from', addr
   print c.recv(1024)
   c.close()                # Close the connection

和客户:

import socket               # Import socket module

s = socket.socket()         # Create a socket object
s.connect(('localhost', 12345))
s.sendall('Here I am!')
s.close()                     # Close the socket when done

Answer 2

上面的答案会引发错误：TypeError: a bytes-like object is required, not 'str' 但是，以下代码对我有用：

服务器.py

import socket
import sys

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
port = 3125
s.bind(('0.0.0.0', port))
print ('Socket binded to port 3125')
s.listen(3)
print ('socket is listening')

while True:
    c, addr = s.accept()
    print ('Got connection from ', addr)
    print (c.recv(1024))
    c.close()

客户端.py：

import socket

s = socket.socket()
port = 3125
s.connect(('localhost', port))
z = 'Your string'
s.sendall(z.encode())    
s.close()