python网络编程测试－host应答

五一假期最后一天，随便写写code，先上个小小服务器应答UDP请求。

由于本人只有一台机器，所以使用的是lo0端口，socket设置为SO_REUSEADDR

服务器端：
[python] #test of host

import sys , socket , traceback , time

host = ''
xport = sys.argv[1]

try:
port = int(xport)
except ValueError:
port = socket.getservbyname(xport , 'UDP')

s = socket.socket(socket.AF_INET , socket.SOCK_DGRAM)
s.setsockopt(socket.SOL_SOCKET , socket.SO_REUSEADDR , 1)
s.bind((host , port))

print('waiting for a client...')

while True:
try:
    message , address = s.recvfrom(1024)
    if(message == 'time\n'):
      print('get a client request for time...')
      s.sendto('reply: ' + time.ctime() , address)
    elif((message == 'hi\n') or (message == 'hello\n')):
      print('get a client from:' , address)
      s.sendto('reply: hi client' , address)
    else:
      print('get a client from: ' , address)
      s.sendto('what would you need? ' , address)
except (KeyboardInterrupt , SystemExit):
    raise
except:
    traceback.print_exc()
#test of host

import sys , socket , traceback , time

host = ''
xport = sys.argv[1]

try:
port = int(xport)
except ValueError:
port = socket.getservbyname(xport , 'UDP')

s = socket.socket(socket.AF_INET , socket.SOCK_DGRAM)
s.setsockopt(socket.SOL_SOCKET , socket.SO_REUSEADDR , 1)
s.bind((host , port))

print('waiting for a client...')

while True:
try:
message , address = s.recvfrom(1024)
if(message == 'time\n'):
   print('get a client request for time...')
   s.sendto('reply: ' + time.ctime() , address)
elif((message == 'hi\n') or (message == 'hello\n')):
    print('get a client from:' , address)
   s.sendto('reply: hi client' , address)
else:
   print('get a client from: ' , address)
   s.sendto('what would you need? ' , address)
except (KeyboardInterrupt , SystemExit):
raise
except:
traceback.print_exc()

客户端：

[python]#test of udp

import sys , socket

host = sys.argv[1]
xport = sys.argv[2]

s = socket.socket(socket.AF_INET , socket.SOCK_DGRAM)

try:
port = int(xport)
except ValueError:
port = socket.getservbyname(xport , 'UDP')

try:
s.connect((host , port))

print('input the data')
data = sys.stdin.readline()
s.sendall(data)

except socket.error , e:
#test of udp

import sys , socket

host = sys.argv[1]
xport = sys.argv[2]

s = socket.socket(socket.AF_INET , socket.SOCK_DGRAM)

try:
port = int(xport)
except ValueError:
port = socket.getservbyname(xport , 'UDP')

try:
s.connect((host , port))

print('input the data')
data = sys.stdin.readline()
s.sendall(data)

except socket.error , e:
开启两个终端测试下：

客户端输入并得到服务器端回应（UDP）：

服务器端显示：

OK,最后还有些要总结的

1 首先是KeyboardInterrupt中断处理，win32上的处理办法与Linux或者UNIX不同，需要注意

2 使用try...finally代码块关闭socket

3 关于socket选项，使用Python shell查询的小技巧（感觉有点像SQL）

摘自 FishinLab的专栏

补充：Web开发 , Python ,