Question

我试图为此找到答案，但大多数示例都是针对纯粹的基于回声的套接字服务器。

基本上我有以下代码：

import socket
import sys
from thread import *

HOST = ''   # Symbolic name meaning all available interfaces
PORT = 8888 # Arbitrary non-privileged port

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
print 'Socket created'

#Bind socket to local host and port
try:
    s.bind((HOST, PORT))
except socket.error as msg:
    print 'Bind failed. Error Code : ' + str(msg[0]) + ' Message ' + msg[1]
    sys.exit()

print 'Socket bind complete'

#Start listening on socket
s.listen(10)
print 'Socket now listening'

#Function for handling connections. This will be used to create threads
def clientthread(conn):
    #Sending message to connected client
    conn.send('Welcome to the server. Type something and hit enter\n') #send only takes string

    #infinite loop so that function do not terminate and thread do not end.
    while True:

        #Receiving from client
        data = conn.recv(1024)
        if data == "hello":
                reply = 'OK...Hello back to you'
        else:
                reply = '01:OK - ' + data
        if not data:
            break

        conn.sendall(reply)

    #came out of loop
    conn.close()

#now keep talking with the client
while 1:
    #wait to accept a connection - blocking call
    conn, addr = s.accept()
    print 'Connected with ' + addr[0] + ':' + str(addr[1])

    #start new thread takes 1st argument as a function name to be run, second is the tuple of arguments to the function.
    start_new_thread(clientthread ,(conn,))

s.close()

在我尝试使用条件语句之前，一切都很有效。我是python的新手，我使用它作为一种更好的学习方法，但是当下一行运行时，它每次都会跳过if。

#Receiving from client
data = conn.recv(1024)
if data == "hello":
     reply = 'Why hello there!'
else:
     reply = '01:OK - ' + data
if not data:
     break

conn.sendall(reply)

从我连接的telnet客户端只是回复我发送的所有内容，包括我发送的'hello'而不是短语。

我觉得这很简单，但我不确定data变量的格式。

Answer 1

非常接近！

Telnet将发送您提供的任何EOL分隔符以及文本。因此，如果您键入＆＃34;数据＆＃34;然后按Enter键，data实际上类似于hello\r\n。

您可以通过执行更改

等操作来有效地忽略此空白

data = conn.recv(1024)

到

data = conn.recv(1024).strip()

你应该好好去。

编辑：

如评论中所述，网络可能会将消息拆分为多个数据包。要解决此问题，您可以使用socket.makefile()方法获取类似文件的对象，然后使用readline()，它将阻塞直到完整的行可用。例如，将clientthread更改为：

def clientthread(conn):
    #Sending message to connected client
    conn.send('Welcome to the server. Type something and hit enter\n') #send only takes string

    sfh = conn.makefile("r+b", bufsize=0)

    #infinite loop so that function do not terminate and thread do not end.
    while True:

        #Receiving from client
        data = sfh.readline().strip()
        if data == "hello":
                reply = 'OK...Hello back to you'
        else:
                reply = '01:OK - ' + data
        if not data:
            break

        conn.sendall(reply)

    #came out of loop
    conn.close()

== PYTHON ==
Socket created
Socket bind complete
Socket now listening
Connected with 192.168.1.10:42749

== TELNET ==
$ telnet 192.168.1.106 8888
Trying 192.168.1.106...
Connected to 192.168.1.106.
Escape character is '^]'.
Welcome to the server. Type something and hit enter
hello
OK...Hello back to you

简单的Python套接字服务器不采用条件语句

1 个答案: