Python 服务器和客户端无法通信

Question

我一直在关注 Python 中服务器和客户端通信的示例，但我无法让服务器不断侦听新消息、打印它们并将它们发送回客户端以进行打印。任何想法我做错了什么？ 服务器代码：

#Imports
import socket

#Define socket address
TCP_IP = '0.0.0.0'  # consider all incoming IPs 
TCP_PORT = 5000  # port# communicating with the client
BUFFER_SIZE = 1024  # buffer size for receiving data

#Create socket    IPv4            TCP
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
print "Socket created"


s.bind((TCP_IP, TCP_PORT))

s.listen(20)
print "Waiting for a Cli_socket..."

#Wait for Cli_sockect
while True:
    while True:
        # accept Cli_sockection 
        Cli_sock, addr = s.accept()
        print "Cli_sockected with " + addr[0] + " " + str(addr[1])
        # get message from client
        message = Cli_sock.recv(BUFFER_SIZE)
        print message
        # check that there is a message   
        if not message:
            break
        # send message to client
        Cli_sock.send(message)
        print "Sent message"

    s.close()
    print "Socket Closed"

客户端代码：

# a simple client socket
import socket

# define socket address
TCP_IP = '127.0.0.1'  # ip of connecting server
TCP_PORT = 5000  # port communicating server
BUFFER_SIZE = 1024  # buffer size receiving data


# create socket IPv4 & TCP protocol
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
print "Socket created successfully."

# connect to server
s.connect((TCP_IP, TCP_PORT))
print "Established connection with the server."
data = s.recv(BUFFER_SIZE)

while True:
    print ("Message to send:")
    message = raw_input()
    s.send(message)
    print "Message sent to server: %s." % message
    print ("Message Recv:%s\n" % data)

Answer 1

在发送任何内容之前，您的服务器正在等待来自客户端的数据：

Cli_sock, addr = s.accept()
print "Cli_sockected with " + addr[0] + " " + str(addr[1])
# get message from client
message = Cli_sock.recv(BUFFER_SIZE)

您的客户端在发送任何内容之前正在等待来自服务器的数据：

s.connect((TCP_IP, TCP_PORT))
print "Established connection with the server."
data = s.recv(BUFFER_SIZE)

因此，双方都在等待对方发送数据，但没有人这样做。这就是它挂起的原因。