socketserver 实现多路复用 例子：远程指令

原生socket只能同时处理一个请求，

多路复用（select、poll、epoll）可以伪并发

socketserver模块可以真正并发处理多个客户端的请求，它内部调用了socket、多路复用和多线程

 

 实现多个客户端可以同时跟服务器发送消息：

服务器端：

import socketserver 

class MyServer(socketserver.BaseRequestHandler):  #必须继承这个类
    def handle(self):   #必须创建名为"handle"的方法，这个方法包含了处理并发功能，self有三个参数，self.request（客户端连接套接字）\self.client_address\self.server
        con = self.request
        con.sendall(bytes("welcome to connect me:",encoding = "utf-8"))
        while True:
            by = con.recv(1024)
            st = str(by,encoding = "utf-8")
            print(st)
            a = input("me:")
            con.sendall(bytes(a,encoding = "utf-8"))

if __name__ == '__main__':
    server = socketserver.ThreadingTCPServer(("192.168.0.104",9999),MyServer)
    server.serve_forever() #这其实是个while循环

客户端：

import socket
obj = socket.socket()
obj.connect(("192.168.0.104",9999,))

ret_bytes = obj.recv(1024)
ret_str = str(ret_bytes,encoding = "utf-8")
print(ret_str) #打印出服务器返回的"welcome to connetc me:"

While True:
　　inp = input("me:")
　　obj.sendall(bytes(inp,encoding = "utf-8"))
　　ret_bytes = obj.recv(1024)
　　ret_str = str(ret_bytes,encoding = "utf-8")
　　print(ret_str)

obj.close()

 

通过客户端连到服务器，执行shell命令，（此例子只能执行那些执行完显示内容的命令，如ls、pwd，不能执行如touch、vim、cd等命令。）

服务器端：

import socketserver
import subprocess

class myserver(socketserver.BaseRequestHandler):
    def handle(self):
        while True:
            conn = self.request
            conn.sendall(bytes("welcome..", encoding="utf-8"))
            while True:
                rev_by = conn.recv(1024)
                print(str(rev_by,encoding="utf-8"))
                if not rev_by:break
                rev_str = str(rev_by,encoding="utf-8")
                print(rev_str)
                result_str = subprocess.getoutput(rev_str)
                result_bytes = bytes(result_str,encoding="utf-8")
                print(result_str)
                info_str = "info|%d"%len(result_bytes)
                conn.sendall(bytes(info_str,encoding="utf-8"))
                print(info_str)
                conn.sendall(result_bytes)

if __name__ == "__main__":
    server = socketserver.ThreadingTCPServer(("127.0.0.1",8008),myserver)
    server.serve_forever()

客户端：

import socket
obj = socket.socket()
obj.connect(("127.0.0.1", 8008))
by = obj.recv(1024)
str11 = str(by,encoding="utf-8")

while 1:
    inp = input("#")
    obj.sendall(bytes(inp,encoding="utf-8"))
    byt = obj.recv(1024)
    str1 = str(byt,encoding="utf-8")
    print("this is str1",str1)

    len1 = int(str1.split("|")[1])
    print("文件大小：",len1)
    has_recv = 0
    content_byt = bytes()
    while has_recv != len1: #此处可能会出现粘包。所以可以在服务器连续两次发送之间插入一个recv()，相应的客户端也插入一个sendall()
        by =obj.recv(1024)
        has_recv += len(by)
        content_byt += by   #content_byt这个变量可以不要，直接让下面端st = str(by,encoding="utf-8")也可以。
    st = str(content_byt,encoding="utf-8")
    print(st)
obj.close()