190426网络编程

一、简单socket示例

服务端

import socket

phone = socket.socket(socket.AF_INET,socket.SOCK_STREAM)  #AF_INET: ipv4, SOCK_STREAM: TCP
phone.bind(("127.0.0.1", 8888,))
phone.listen(5)  #可以同时接受5个连接
conn,addr = phone.accept()  #conn:连接，addr:对方ip地址
# print(conn,addr)

msg = conn.recv(1024)  #接收1024个字节的信息
print("对方发来的消息：",msg.decode("utf-8"))
conn.send(msg.upper())  #发送

conn.close()
phone.close()

客户端

import socket

phone = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
phone.connect(("127.0.0.1", 8888,))

phone.send("hello".encode("utf-8"))
msg = phone.recv(1024)
print("服务端发来的消息：",msg.decode("utf-8"))

二、循环收发

服务端

from socket import *

ip_port = ('127.0.0.1', 8888,)
back_log = 5
buffer_size = 1024

tcp_server = socket(AF_INET,SOCK_STREAM)
tcp_server.bind(ip_port)
tcp_server.listen(back_log)

print("服务端启动 ...")
conn,addr = tcp_server.accept()
print("双向连接", conn)
print("客户端地址", addr)

while True:
    data = conn.recv(buffer_size)
    print("客户端发来的消息：",data.decode("utf-8"))
    conn.send(data.upper())

conn.close()
tcp_server.close()

客户端

from socket import *

ip_port = ('127.0.0.1', 8888,)
back_log = 5
buffer_size = 1024

tcp_client = socket(AF_INET,SOCK_STREAM)
tcp_client.connect(ip_port)
while True:
    msg = input(">>: ").strip()
    if not msg:continue  #判断输入的信息是否为空
    tcp_client.send(msg.encode("utf-8"))
    print("已经发送成功！")
    data = tcp_client.recv(buffer_size)
    print("服务器发送来的消息：",data.decode("utf-8"))

tcp_client.close()

三、循环提供服务(多客户端串行)

服务端

from socket import *

ip_port = ('127.0.0.1', 8888,)
back_log = 5
buffer_size = 1024

tcp_server = socket(AF_INET,SOCK_STREAM)
tcp_server.setsockopt(SOL_SOCKET,SO_REUSEADDR,1)  #重新使用套接字和地址，防止发生tcp连接未断开情况
tcp_server.bind(ip_port)
tcp_server.listen(back_log)

print("服务端启动 ...")
while True:
    conn,addr = tcp_server.accept()
    print("双向连接", conn)
    print("客户端地址", addr)

    while True:
        try:
            data = conn.recv(buffer_size)
            if not data:break  #防止客户端端口一只收空
            print("客户端发来的消息：",data.decode("utf-8"))
            conn.send(data.upper())
        except Exception:
            break

    conn.close()

tcp_server.close()

客户端

from socket import *

ip_port = ('127.0.0.1', 8888,)
back_log = 5
buffer_size = 1024

tcp_client = socket(AF_INET,SOCK_STREAM)
tcp_client.connect(ip_port)
while True:
    msg = input(">>: ").strip()
    if not msg:continue  #判断输入的信息是否为空
    tcp_client.send(msg.encode("utf-8"))
    print("已经发送成功！")
    data = tcp_client.recv(buffer_size)
    print("服务器发送来的消息：",data.decode("utf-8"))

tcp_client.close()

四、udp协议的socket编程(ntp服务)

服务端

from socket import *
import time
ip_port = ('127.0.0.1', 8889,)
buffer_size = 1024

udp_server = socket(AF_INET,SOCK_DGRAM)  #SOCK_DGRAM: 数据报式的套接字，udp
udp_server.bind(ip_port)

while True:
    data, addr = udp_server.recvfrom(buffer_size)
    print(data.decode("utf-8"))
    back_time = time.strftime('%Y-%m-%d %X')
    udp_server.sendto(back_time.encode("utf-8"),addr)

客户端

from socket import *
ip_port = ('127.0.0.1', 8889,)
buffer_size = 1024

udp_clinet = socket(AF_INET,SOCK_DGRAM)

while True:
    msg = input(">>: ").strip()
    udp_clinet.sendto(msg.encode("utf-8"), ip_port)

    data,addr = udp_clinet.recvfrom(buffer_size)
    print("服务器当前时间：",data.decode("utf-8"))

五、基于tcp的ssh服务

服务端

from socket import *
import subprocess
import struct

ip_port = ("127.0.0.1", 8888,)
back_log = 5
buffer_size = 1024

tcp_server = socket(AF_INET,SOCK_STREAM)
tcp_server.bind(ip_port)
tcp_server.listen(back_log)

while True:
    conn,addr = tcp_server.accept()
    print("新客户端连接：", addr)
    while True:
        try:
            cmd = conn.recv(buffer_size)
            if not cmd:break
            print("收到客户端的命令：", cmd)

            res = subprocess.Popen(cmd.decode("utf-8"),
                                   shell=True,
                                   stdout=subprocess.PIPE,
                                   stdin=subprocess.PIPE,
                                   stderr=subprocess.PIPE)
            err = res.stderr.read()
            if err:
                cmd_res = err
            else:
                cmd_res = res.stdout.read()
            if not cmd_res:
                cmd_res = "执行成功".encode("gbk")

            #解决粘包问题
            length = len(cmd_res)
            data_length = struct.pack('i',length)  #将数字转换为byte类型
            conn.send(data_length)
            conn.send(cmd_res)

        except Exception as e:
            print(e)
            break
    conn.close()

客户端

from socket import *
import struct
from functools import partial

ip_port = ("127.0.0.1", 8888,)
back_log = 5
buffer_size = 1024

tcp_client = socket(AF_INET,SOCK_STREAM)
tcp_client.connect(ip_port)

while True:
    cmd = input(">>: ").strip()
    if not cmd:continue
    if cmd == "quit":break

    tcp_client.send(cmd.encode("utf-8"))

    #解决粘包
    length_data = tcp_client.recv(4)
    length = struct.unpack('i',length_data)[0]

    recv_size = 0
    recv_msg = b''
    while recv_size < length:
        recv_msg += tcp_client.recv(buffer_size)
        recv_size = len(recv_msg)

    # for i in iter(partial(tcp_client.recv,buffer_size), b''):
    #     recv_msg += i

    print(recv_msg.decode("gbk"))

tcp_client.close()

六、socketserver模块

server类：处理连接

BaseServer

TCPServer

UnixStreamServer

UDPServer

UnixDatagramServer

request类：处理通信

BaseRequestHandler

StreamRequestHandler

DatagramRequestHandler

服务端

import socketserver

class MyServer(socketserver.BaseRequestHandler):
    def handle(self):
        print(self.request)  #conn
        print(self.client_address)  #addr

        while True:
            try:
                data = self.request.recv(1024)
                if not data:break
                print("收到客户端的消息：",data)

                self.request.sendall(data.upper())
            except Exception:
                break

if __name__ == '__main__':
    tcp_server = socketserver.ThreadingTCPServer(('127.0.0.1',8888),MyServer)  #多线程的tcp server
    tcp_server.serve_forever()

客户端

from socket import *

ip_port = ("127.0.0.1", 8888,)
back_log = 5
buffer_size = 1024

tcp_client = socket(AF_INET,SOCK_STREAM)
tcp_client.connect(ip_port)

while True:
    msg = input(">>: ").strip()
    if not msg:continue
    if msg == "quit":break

    tcp_client.send(msg.encode("utf-8"))
    data = tcp_client.recv(buffer_size)
    print(data.decode("utf-8"))

ftp代码：https://files.cnblogs.com/files/L-dongf/python_ftp.zip

一、简单socket示例

二、循环收发

三、循环提供服务(多客户端串行)

四、udp协议的socket编程(ntp服务)

五、基于tcp的ssh服务

六、socketserver模块

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