Python 客户端无法连接到服务器

Question

自过去 3 天以来，我一直在尝试修复此错误，但我慢慢厌倦了它，请有人指出我正确的方向吗？

所以，我写了两个脚本，一个是服务器，另一个是客户端

服务器.py

​​>

#!/usr/python

import socket
import os

port = 3000

def clear():
    os.system('clear')
    print("-:-:-:-:-:Server:-:-:-:-:-")

#Starting Server
serversocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
serversocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
host = socket.gethostname()
serversocket.bind((host, port))
serversocket.listen(1)

clear()

clientsocket, addr = serversocket.accept()
print("Connection from: " + str(addr))
while True:
    msg = raw_input(" ->")

    if msg == "help":
        clear()
        print("+-----------------------------------+")
        print("|             Help Menu             |")
        print("+-----------------------------------+")      
        print("|   help       -   shows help menu  |")
        print("+-----------------------------------+")
        print("|   clear      -   clears           |")
        print("+-----------------------------------+")
        raw_input("Press ANY key to return")
        clear()
    elif msg == "clear":
        clear()
    else:
        msg = str(msg).encode("UTF-8")
        clientsocket.send(msg)
        msg = clientsocket.recv(4096)
        print(msg.decode("UTF-8"))

和

客户端.py

​​>

#!/usr/python

import socket
import time

def send(msg):
    try:
        s.send(msg.encode("UTF-8"))
    except:
        Connect()

def getInstructions():
    try:
        while True:
            msg = s.recv(4096)
            inst = msg.decode("UTF-8")
            time.sleep(5)
            send("!")
    except:
        Connect()

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = socket.gethostname()

def Connect():
    try:
        print("Connect() connecting to: "+ str(host) + str(3000)) 
        s.connect((host, 3000))
        getInstructions()
    except:
        time.sleep(1)
        print("Connect() Exception")
        Connect()
Connect()

简而言之，我的程序所做的是

服务器启动并等待传入​​流量

客户端启动并向服务器发送流量

客户端每 5 秒发送一个字符串（在这种情况下为“！”），如果服务器没有收到它，客户端正在尝试重新连接到服务器，这是问题所在，客户端没有重新连接，它卡在了Connect() 循环，因为它不能再重新连接了

我尝试在重新连接时始终创建一个新套接字

客户端.py

​​>

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = socket.gethostname()

    def Connect():
        try:
            print("Connect() connecting to: "+ str(host) + str(3000))
            s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            s.connect((host, 3000))
            getInstructions()
        except:
            time.sleep(1)
            print("Connect() Exception")
            Connect()

这似乎以某种方式解决了问题，客户端能够重新连接到服务器，但这一行确实更破坏了代码，客户端显示为由服务器连接，但客户端没有收到任何发送的数据。

还有一些好话，然后客户端连接到服务器，然后我停止服务器，客户端进入“重新连接模式”，然后我再次启动服务器，没有任何反应，客户端是仍在尝试重新连接（但失败）。现在我必须重新启动客户端才能重新连接，这并不是我真正想要的..

Answer 1

我终于..终于！找到了这个不起作用的原因.. （我不是专家，所以也许有人可以将其更改为更“准确”）

我创建了一个 TCP 套接字连接，它可能将其连接详细信息完全保存在变量 s 中

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

关于连接详细信息，我的意思可能是它自己的，例如服务器具有不会改变太多的静态详细信息（端口 3000 上的 192.168.2.100），但客户端不使用该特定端口进行通信，客户端需要一些可用的随机端口，出于某种原因，这就是客户端无法工作的原因 （但那只是我的论文，我不知道更好..）

但这就是我改变的地方

客户端.py

​​>

#Connection
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = socket.gethostname()

def Reconnect():  #Ive created a new function called Reconnect, because, .., well it works fine for now
    try:
        global s #Its accessing the global socket variable
        s = ""   #blanks it out (not sure if i have to blank it out)
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) # create again a new socket
        s.connect((host, port)) # It tries to connect again
        getInstructions() # done~
    except:
        time.sleep(1)
        print("Reconnecting")
        Reconnect()

def Connect():
    try:
        print("Connect() connecting to: "+ str(host) + str(port)) 
        s.connect((host, port))
        getInstructions()
    except:
        time.sleep(1)
        print("Connect() Exception, trying to Reconnect()")
        Reconnect()

但这就是我如此热爱编程的原因，它当然是一把 2 片刀，但该死的，这感觉就像你在 10 秒内解决了一个愚蠢的错误后得到的。值得打字

Answer 2

服务器需要接收命令。

Server.py

import socket
import os

port = 3000

#Starting Server
serversocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
serversocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
host = socket.gethostname()
serversocket.bind((host, port))
serversocket.listen(1)

clientsocket, addr = serversocket.accept()
print("Connection from: " + str(addr))

clientsocket.send("-:-:-:-:-: Connected in theServer :-:-:-:-:-")

def menuHelp():
    clientsocket.send("\
+-----------------------------------+ \n \
|             Help Menu             | \n \
+-----------------------------------+ \n \
|   help       -   shows help menu  | \n \
+-----------------------------------+ \n \
|   clear      -   clears           | \n \
+-----------------------------------+")

while True:
    msg = clientsocket.recv(4096)
    msg = msg.decode("UTF-8")

    if msg == "help":
        menuHelp()
    elif msg == "clear":
        clientsocket.send("Command Clear\n")
    else:
        clientsocket.send("invalid option\n")
        menuHelp()

和客户。

Client.py

import socket
import time

def send(msg):
    try:
        s.send(msg.encode("UTF-8"))
    except:
        Connect()

def getInstructions():
    try:
        msg = s.recv(4096)
        print(msg.decode("UTF-8"))
        input("Press ANY key to return")
    except:
        Connect()

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
host = socket.gethostname()

def Connect():
    try:
        print("Connect() connecting to: "+ str(host) + str(3000)) 
        s.connect((host, 3000))
        send("help")

        while True:
            getInstructions()       
            cli = input(" ->")
            send(cli)
    except:
        time.sleep(1)
        print("Connect() Exception")
        Connect()
Connect()