python模块——socket

实例一、

server：
　　#socket套接字（IP + 端口号）（qq，wechat 发送接收消息依靠socket模块）,cs架构
import socket
server = socket.socket()
　　#实例化出一个socket对象,默认tcp/ip协议
server.bind(('127.0.0.1',8888))
　　#绑定客户端，VIP，元组形式，('')相当于（'0.0.0.0'）
　　#声明出client端该访问那个地址和端口号
server.listen(5)
　　#半连接池，listen(5)最大连接数
print('wait telephone..........')
conn,addr = server.accept()
　　#监听是否有客户端来连接
　　#运行会产生两个返回值：连接信息，客户端信息
print('call telephone............')
data = conn.recv(10240)
　　#接收到的信息。10240：最大接受的字节，随便写'
print(data.decode('utf-8'))

client：
importsocket
client=socket.socket()
client.connect(('127.0.0.1',8888))
cmd=input('==>:')
client.send(cmd.encode('utf-8'))

结果：

实例2、

利用subprocess模块和socket模块在其他主机执行cmd命令：

server：
import socket,subprocess
server = socket.socket()
server.bind(('127.0.0.1',8888))
server.listen(5)
print('wait telephone..........')
conn,addr = server.accept()
print('call telephone............')
while True:
    cmd = conn.recv(10240)
    process = subprocess.Popen(cmd.decode('utf-8'),
                               shell=True,
                               stdout=subprocess.PIPE,
                               stderr=subprocess.PIPE
                               )
    stdout=process.stdout.read()
    stderr=process.stderr.read()
    result = stdout+stderr
    conn.send(result)

client：
import socket
client = socket.socket()
client.connect(('127.0.0.1',8888))
while True:
    cmd = input('==>:').strip()
    if cmd:
        client.send(cmd.encode('utf-8'))
    else:
        continue
    result = client.recv(10240)
    print(result.decode('gbk'))

　结果：　

实例3、

简易聊天软件（首先利用socket建立两台机器的通信，再利用多线程让发送消息和接收消息同时运行。）

server：
import socket,threading
server = socket.socket()
server.bind(('127.0.0.1',8888))
server.listen(5)
print('wait telephone..........')
conn,addr = server.accept()
print('call telephone............')
def recv():
    while True:
        data = conn.recv(1024)
        print(data.decode('utf-8'))
def send():
    while True:
        cmd = input('==>:')
        conn.send(cmd.encode('utf-8'))
t1 = threading.Thread(target=recv)
t2 = threading.Thread(target=send)
t1.start()
t2.start()

client：
import socket,threading
client = socket.socket()
client.connect(('127.0.0.1',8888))
def send():
    while True:
        cmd = input('==>:').strip()
        client.send(cmd.encode('utf-8'))
def recv():
    while True:
        data = client.recv(1024)
        print(data.decode('gbk'))

t1 = threading.Thread(target=recv)
t2 = threading.Thread(target=send)
t1.start()
t2.start()

　结果：

　

实例4、

检查IP地址和端口号通不通：

import socket
hosts = ['192.168.254.12:80','192.168.254.12:3306','2.2.2.2:80','3.3.3.3:80']
socket.setdefaulttimeout(1)

for host in hosts:
    ip = host.split(':')[0]
    port = host.split(':')[1]
    server = socket.socket()
    res = server.connect_ex((ip,int(port)))
    # 如果res为0代表ok，不为0代表连接失败
    if res == 0:
        print('%s is ok' % ip)
    else:
        print('%s is 不ok' % ip)

import socket
socket.setdefaulttimeout(1)            #超时时间
host_list = ['192.168.4.145:5555','192.168.4.146:555','192.168.4.147:5555','192.168.31.199:445']
for info in host_list:
    server = socket.socket()
    ip = re.compile('(.*?):(.*)').search(info).group(1)
    port = re.compile('(.*?):(.*)').search(info).group(2)
    res = server.connect_ex((ip, int(port)))
    if res == 0:
        print('%s--%s端口正常' % (ip, port))
    else:
        print('%s--%s端口异常' % (ip, port))