python网络编程实例
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文章目录
python网络编程实例
字符串转换实例
使用SOCK_STREAM方式通信，服务端接收到来自客户端的字符串转换为大写后返回给客户端
str_socket_s.py 服务端代码
#!/usr/bin/env python3
# coding:utf-8
import socket //导入socket模块
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM) //构造socket对象，使用ipv4地址和TCP方式通信
s.bind(('192.168.247.100',10086)) //调用bind函数将对象s绑定到元组（'192.168.247.100',100086）上
s.listen(1) //监听来自客户端的连接，1表示只接收一个连接
print('Wait for connecting...')
(conn,addr) = s.accept() //调用accept函数接受一个来自客户端的连接，返回元组（conn,addr），其中conn也是一个socket对象，用来与客户端通信，addr为元组变量，保存客户端IP和端口。
print('conn = ',conn)
print('addr = ',addr)
while True:
str1 = conn.recv(1024) //conn通过recv函数控制一次接收字节流的大小
str2 = str(str1,encoding = 'utf-8') //将字节流数据转换为字符串
print('I received a string is:',str2)
str3 = str2.upper() //通过upper方法将小写转换为大写
conn.send(str3.encode('utf-8')) //最后将字符转转换回字节流发送给客户端
if str2 =='.':
break
conn.close() //关闭连接
s.close() //释放socket对象
str_socket_c.py 客户端代码
#!/usr/bin/env python3
# coding:utf-8
import socket
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
s.connect(('192.168.247.100',10086)) //调用connect函数连接服务器
print('I am connecting the server')
while True:
xx = input('请输入字符串：') //接收字符串
s.send(xx.encode('utf-8')) //将字符串转换为字节流，然后通过socket对象发送给服务端
str1 = s.recv(1024) //控制服务端返回的字节流的接收大小
str2 = str(str1,encoding = 'utf-8') //将服务端返回的字节流转换为字符串
print('The original string is :',xx,'\\ttheprocessed string is:',str2)
if xx == '.':
break
s.close()
测试效果：
服务端
[root@localhost ~]# python3 str_socket_s.py
Wait for connecting...
conn = <socket.socket fd=4, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=('192.168.247.100', 10086), raddr=('192.168.247.100', 36738)>
addr = ('192.168.247.100', 36738)
I received a string is: haha
I received a string is: xixi
I received a string is: hehe
I received a string is: .
客户端
[root@localhost ~]# python3 str_socket_c.py
I am connecting the server
请输入字符串：haha
The original string is : haha theprocessed string is: HAHA
请输入字符串：xixi
The original string is : xixi theprocessed string is: XIXI
请输入字符串：hehe
The original string is : hehe theprocessed string is: HEHE
请输入字符串：.
The original string is : . theprocessed string is: .
文件下载实例
服务端代码：
#!/usr/bin/env python3
# coding:utf-8
import socket
import os
def sendfile(conn):
str1 = conn.recv(1024)
filename = str1.decode('utf-8')
print('The client requests my file:',filename)
if os.path.exists(filename):
print('I have %s,begin to download!' % filename)
conn.send(b'yes')
conn.recv(1024)
size = 1024
with open(filename,'rb') as f:
while True:
data = f.read(size)
conn.send(data)
if len(data) < size:
break
print('%s is downloaded successfully!' % filename)
else:
print('Sorry,I have no %s!' % filename)
conn.send(b'no')
conn.close()
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
s.bind(('192.168.247.100',10086))
s.listen(10)
print('Wait for connecting...')
while True:
(conn,addr) = s.accept()
sendfile(conn)
客户端代码：
#!/usr/bin/env python3
# coding:utf-8
import socket
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
s.connect(('192.168.247.100',10086))
filename = input('请用绝对路径输入想要下载的文件:')
print('I want to get the file %s!' %filename)
s.send(filename.encode('utf-8'))
str1 = s.recv(1024)
str2 = str1.decode('utf-8')
if str2 == 'no':
print('To get the file %s failed!' % filename)
else:
s.send(b'I am ready!')
temp = filename.split('/')
myname = 'my_' + temp[len(temp)-1]
size = 1024
with open (myname,'wb') as f:
while True:
data = s.recv(size)
f.write(data)
if len(data) < size:
break
print('The downloaded file is %s. ' % myname)
s.close()
测试效果
服务端
[root@localhost ~]# ls /tmp
test
[root@localhost ~]# python3 download_socket_s.py
Wait for connecting...
The client requests my file: /tmp/test
I have /tmp/test,begin to download!
/tmp/test is downloaded successfully!
客户端
[root@localhost ~]# ls
anaconda-ks.cfg download_socket_s.py network.sh str_socket_c.py
download_socket_c.py lzu.html socket01.py str_socket_s.py
[root@localhost ~]# python3 download_socket_c.py
请用绝对路径输入想要下载的文件:/tmp/test
I want to get the file /tmp/test!
The downloaded file is my_test.
[root@localhost ~]# ls
anaconda-ks.cfg lzu.html socket01.py
download_socket_c.py my_test str_socket_c.py
download_socket_s.py network.sh str_socket_s.py
扫描端口实例
代码
#!/usr/bin/env python3
# coding:utf-8
import socket
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
s.settimeout(0.5)#扫描本机设置较短超时时间
ip = input('请输入要扫描主机的ip:')
start = 0
stop = 65535
for port in range(int(start),int(stop)):
result = s.connect_ex((ip,port))
if result == 0:
print(ip+'上的'+str(port)+'端口是开启的' )
s.close()
测试效果
[root@localhost ~]# python3 port.py
请输入要扫描主机的ip:192.168.247.214
192.168.247.214上的22端口是开启的
192.168.247.214上的23端口是开启的
[root@localhost ~]# ss -anlt
State Recv-Q Send-Q Local Address:Port Peer Address:Port Process
LISTEN 0 128 0.0.0.0:22 0.0.0.0:*
LISTEN 0 128 [::]:22 [::]:*
获取服务端CPU使用情况实例
服务端代码：
#!/usr/bin/env python3
# coding:utf-8
import socket
import psutil
def do_cpu():
data = str(psutil.cpu_percent(0)) + '%\\n'
count = 0
for process in psutil.process_iter():
data = data + process.name()
data = data + ',' + str(process.pid)
cpu_usage_rate_process = str(process.cpu_percent(0)) + '% '
data = data + ',' +cpu_usage_rate_process + '\\n'
count+=1
if count == 10:
break
return data
s = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
s.bind(('192.168.247.100',10086))
print('Bind UDP on 10086')
while True:
(info,addr) = s.recvfrom(1024)
data = do_cpu()
s.sendto(data.encode('utf-8'),addr)
print('The client is ',addr)
print('Sended CPU data is:',data)
客户端代码：
#!/usr/bin/env python3
# coding:utf-8
import socket
s = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
s_addr = ('192.168.247.100',10086)
s.sendto(b'CPU info',s_addr)
(data_b,addr) = s.recvfrom(1024)
if addr == s_addr:
data_s = data_b.decode('utf-8')
data_list = data_s.split('\\n')
print('CPU usage rate is',data_list[0])
print('Top 10 processes are flowing...')
print('% -20s% -5s% -10s' % ('NAME','PID','CPU usage'))
data_list = data_list[1:-1]
for xx in data_list:
yy = xx.split(',')
print('% -20s% -5s% -10s' % (yy[0],yy[1],yy[2]))
s.close()
测试效果
服务端
[root@localhost ~]# python3 cpu_s.py
Bind UDP on 10086
The client is ('192.168.247.100', 40648)
Sended CPU data is: 0.2%
systemd,1,0.0%
kthreadd,2,0.0%
rcu_gp,3,0.0%
rcu_par_gp,4,0.0%
kworker/0:0H-kblockd,6,0.0%
mm_percpu_wq,9,0.0%
ksoftirqd/0,10,0.0%
rcu_sched,11,0.0%
migration/0,12,0.0%
watchdog/0,13,0.0%
客户端
[root@localhost ~]# python3 cpu_c.py
CPU usage rate is 0.2%
Top 10 processes are flowing...
NAME PID CPU usage
systemd 1 0.0%
kthreadd 2 0.0%
rcu_gp 3 0.0%
rcu_par_gp 4 0.0%
kworker/0:0H-kblockd6 0.0%
mm_percpu_wq 9 0.0%
ksoftirqd/0 10 0.0%
rcu_sched 11 0.0%
migration/0 12 0.0%
watchdog/0 13 0.0%
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