TCPServer+StreamRequestHandler 网络编程

注意的几点：

1.StreamRequestHandler类支持像操作文件对象那样操作输入套字节;

2.网络传输的数据需时bytes;

3.客户端和服务器端发送的消息都必须加上回车和换行符号

4.socketserver的请求处理器的默认行为是接受连接，得倒请求，然后关闭连接，而不是一直保持连接状态。从而多个连接可以并发进行。

服务器端代码：

from socketserver import (TCPServer, StreamRequestHandler)
from time import ctime

HOST = ''
PORT = 12345 
ADDR = (HOST, PORT)

class MyHandler(StreamRequestHandler):
    def handle(self):
        print ('...connect from:', self.client_address) #self.client_address 得到客户端地址
        data = '[%s]%s' % (ctime(), self.rfile.readline().decode('UTF-8')) #rfile.reaadline()方法来读取客户消息
        self.wfile.write(bytes(data, 'UTF-8'))#wfile.write()发送消息，在python3x后必须将str转化为bytes对象才能在网络中传续

tcpSer = TCPServer(ADDR, MyHandler)
print ('waiting for connecting...')
tcpSer.serve_forever()

客户端代码：

from socket import *

HOST = 'localhost'
PORT = 12345
ADDR = (HOST, PORT)
BUFSIZE = 1024

def main():
    while True:
        tcpCliSock = socket(AF_INET, SOCK_STREAM)
        tcpCliSock.connect(ADDR)
        data = input('>')
        if not data:
            break;
        tcpCliSock.send(bytes(data + '\r\n', 'UTF-8'))
        data = tcpCliSock.recv(BUFSIZE).decode('UTF-8')
        if not data:
            break;
        print (data)
        tcpCliSock.close()

main()