Python，如何通过TCP发送数据

Question

我需要创建一个侦听TCP连接的简单服务器。 如果它收到文本on<EOF>或off<EOF>，则会发送（回显）回success。接收部分正在工作，但现在我需要它发回success。

代码：

# import threading
import SocketServer

class TCPHandler(SocketServer.BaseRequestHandler): 

   def handle(self):
      self.msg = self.request.recv(1024).strip()
      if self.msg == "on<EOF>":
         print "Turning On..."
         #ECHO "SUCCESS<EOF>"        <----- I need the server to echo back "success"
      if self.msg == "off<EOF>":
         print "Turning Off..."
         #ECHO "SUCCESS<EOF>"        <----- I need the server to echo back "success"


      if __name__ == "__main__": 
         host, port = '192.168.1.100', 1100

  # Create server, bind to local host and port 
  server = SocketServer.TCPServer((host,port),TCPHandler)

  print "server is starting on ", host, port

  # start server
  server.serve_forever()

Answer 1

嗯，我在关注一个非常好的教程前一天做了，无法找到链接，但这里是代码

client.py

import socket

host = socket.gethostname()
port = 12345                   # The same port as used by the server
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((host, port))
s.sendall(b'Hello, world')
data = s.recv(1024)
s.close()
print('Received', repr(data))

对于服务器

echo_server.py

import socket

host = ''        # Symbolic name meaning all available interfaces
port = 12345     # Arbitrary non-privileged port
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((host, port))

print host , port
s.listen(1)
conn, addr = s.accept()
print('Connected by', addr)
while True:

    try:
        data = conn.recv(1024)

        if not data: break

        print "Client Says: "+data
        conn.sendall("Server Says:hi")

    except socket.error:
        print "Error Occured."
        break

conn.close()

Answer 2

使用python 3文档的一种更好的方法是：

服务器

import socketserver

class MyTCPHandler(socketserver.BaseRequestHandler):
    """
    The request handler class for our server.

    It is instantiated once per connection to the server, and must
    override the handle() method to implement communication to the
    client.
    """

    def handle(self):
        # self.request is the TCP socket connected to the client
        self.data = self.request.recv(1024).strip()
        print("{} wrote:".format(self.client_address[0]))
        print(self.data)
        # just send back the same data, but upper-cased
        self.request.sendall(self.data.upper())

if __name__ == "__main__":
    HOST, PORT = "localhost", 9999

    # Create the server, binding to localhost on port 9999
    server = socketserver.TCPServer((HOST, PORT), MyTCPHandler)

    # Activate the server; this will keep running until you
    # interrupt the program with Ctrl-C
    server.serve_forever()

客户

import socket
import sys

HOST, PORT = "localhost", 9999
data = " ".join(sys.argv[1:])

# Create a socket (SOCK_STREAM means a TCP socket)
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as sock:
    # Connect to server and send data
    sock.connect((HOST, PORT))
    sock.sendall(bytes(data + "\n", "utf-8"))

    # Receive data from the server and shut down
    received = str(sock.recv(1024), "utf-8")

print("Sent:     {}".format(data))
print("Received: {}".format(received))

希望有帮助。 阿图罗

Answer 3

如果需要无限/连续的服务器连接，则可以使用以下服务器代码。

服务器代码

    import socket  # Import socket module

    port = 50000  # Reserve a port for your service every new transfer wants a new port or you must wait.
    s = socket.socket()  # Create a socket object
    host = ""  # Get local machine name
    s.bind(('localhost', port))  # Bind to the port
    s.listen(5)  # Now wait for client connection.

    print('Server listening....')

    x = 0

    while True:
        conn, address = s.accept()  # Establish connection with client.

        while True:
            try:
                print('Got connection from', address)
                data = conn.recv(1024)
                print('Server received', data)

                st = 'Thank you for connecting'
                byt = st.encode()
                conn.send(byt)

                x += 1

            except Exception as e:
                print(e)
                break

    conn.close()

客户代码

    import socket  # Import socket module
    import os
    import re


    s = socket.socket()  # Create a socket object
    port = 50000  # Reserve a port for your service every new transfer wants a new port or you must wait.

    s.connect(('localhost', port))
    x = 0

    st = str(x)
    byt = st.encode()
    s.send(byt)

   # send message for hundred times
    while x<100:
        st = str(x)
        byt = st.encode()
        s.send(byt)

        print(x)

        while True:
            data = s.recv(1024)
            if data:
                print(data)
                x += 1
                break

            else:
                print('no data received')



    print('closing')
    s.close()