【转】经典SQL语句大全

创建服务器的步骤：先创建一个request handler类通过子类化BaseRequestHandler然后重载handle()方法。然后通过传入服务器的地址和request handler来初始化一个服务类。最后调用handle_request()或serve_forever()来运行。
TCP：

import SocketServer

class MyTCPServer(SocketServer.BaseRequestHandler):
"""
The RequestHandler class for our server

It is instantiated once per connection to the server, and must
override the handle() method to implement communication to the client.
"""

def handle(self):
#self.request is the TCP socket connected to the client

self.data=self.request.recv(2048).strip()
print '{} wrote:'.format(self.client_address[0])
print self.data
self.request.sendall(self.data.upper())

if __name__=='__main__':
HOST,PORT='',51234
server=SocketServer.TCPServer((HOST,PORT),MyTCPServer)
server.serve_forever()

# class MyTCPServer(SocketServer.StreamRequestHandler):
#     def handle(self):
#self.rfile is a file-like object created by the handler;
#we can now use e.g. readline() instead of raw recv() calls
#         self.data=self.rfile.readline().strip()
#         print '{} wrote:'.format(self.client_address[0])
#         print self.data
#Likewise, self.wfile is a file-like object used to write back
# to the client
#
#         self.wfile.write(self.data.upper())

第二个handler的readline会多次调用recv直到遇到一个换行符，而第一个handler的recv()会返回客户端在一个sendall()里面发送的所有东西。

客户端使用socket编写的话，连接后只能进行一此数据传输，之后便会关闭。

UDP:

import SocketServer

class MyUDPServer(SocketServer.BaseRequestHandler):
"""
This class works similar to TCP handler class,except that self.request
consists of a pair of data and client socket , and since there is no
connnection the client address must be given explicitly when sending
data back via sendto()
"""

def handle(self):
data=self.request[0].strip()
sock=self.request[1]
print "{} wrote:".format(self.client_address[0])
print data
socket.sendto(data.upper(),self.client_address)

if __name__=='__main__':
HOST,PORT='',51234
server=SocketServer.UDPServer((HOST,PORT),MyUDPServer)
server.serve_forever()

本文出自 “莲的思念” 博客，请务必保留此出处http://liandesinian.blog.51cto.com/7737219/1588409