如何让套接字接受多个连接？

Question

目前我有一个只能接受一个连接的套接字服务器。任何第二个连接，它只是挂起，不做任何事情。

服务器可以从一个客户端获取消息发送。我现在只有服务器发回确认信息。

server.py：

import socket, sys 

# some vars 
HOST = "localhost"; 
PORT = 4242; 

# create the socket 
soc = socket.socket(socket.AF_INET, socket.SOCK_STREAM); 

# bind the socket to port 
server_addr = (HOST, PORT); 
print >>sys.stderr, "starting server %s on port %s" % (HOST, PORT); 
soc.bind(server_addr); 

# check for connections 
soc.listen(1); 

while True: 
    # wait for a connection 
    connection, client_address = soc.accept(); 
    try: 
     # since just test 
     # just send back whatever server receives 
     while True: 
      data = connection.recv(16); 
      if data: 
       connection.sendall(str(client_address[1]) + " said " + data); 
    finally: 
     connection.close(); 

client.py：

import socket, sys, thread 

# some vars 
HOST = "localhost"; 
PORT = 4242; 

# create the socket 
soc = socket.socket(socket.AF_INET, socket.SOCK_STREAM); 

# connect to server/port 
server_addr = (HOST, PORT); 
print >>sys.stderr, "connecting to %s on port %s" % (HOST, PORT); 
soc.connect(server_addr); 

# try to send data over 
while True: 
    try: 
     # send the message 
     msg = raw_input("Message: "); 
     soc.sendall(msg); 

     # check if there is response 
     amt_recd = 0; 
     amt_expd = len(msg); 

     while amt_recd < amt_expd: 
      data = soc.recv(16); 
      amt_recd += len(data); 
      print >>sys.stderr, data, "\n"; 
    finally: 
     msg = ''; 

Answer 1

有从服务器这个无限循环没有退出条件：

while True: 
    data = connection.recv(16) 
    if data: 
     connection.sendall(str(client_address[1]) + " said " + data) 

如果客户端关闭连接数据将是空的，但它仍然会继续循环。修复：

while True: 
    data = connection.recv(16) 
    if not data: 
     break 
    connection.sendall(str(client_address[1]) + " said " + data) 

此外，即使修复此问题后，服务器一次只能处理一个连接。如果您希望一次为多个客户端提供服务，则需要使用select.select或为每个客户端连接分离线程。

另外，Python在语句结束时不需要分号。