1、echoserver.py
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# -*- coding:utf-8 -*-
#!/usr/bin/env python
import socket
import sys
import argparse
host = '127.0.0.1'
payload = 2048
backlog = 5
#命令行參數處理
parser = argparse.ArgumentParser(description='Echo Server')
parser.add_argument('--port', action='store', dest='port', type=int, required=True)
obtained_args = parser.parse_args()
port = obtained_args.port
# 創建 server socket
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# 啓用套接字端口重用
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
# 綁定socket端口
server_addr = (host, port)
print 'Starting up Echo Server on %s port %s' % server_addr
sock.bind(server_addr)
# 監聽客戶端連接，backlog指定客戶端最大連接數
sock.listen(backlog)
while True:
print 'Waiting to receive message from client'
client, address = sock.accept()
data = client.recv(payload)
if data:
print 'Data: %s' % data
client.send(data)
print 'sent %s bytes back to %s' % (data, address)
# 連接關閉
client.close()
2、運行echoserver.py
$ python echoserver.py --port 9090
3、模擬客戶端連接
使用telnet模擬客戶端：
$ telnet 127.0.0.1 9090
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
hello world!
hello world!
Connection closed by foreign host.
轉自：www.pythonfan.org