TCP

• 客户端

import socket
# 1.创建一个socket,AF_INET代表IPv4
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

# 2.建立连接,前者是域名或者IP，后者是端口号，Web是80，FTP是21，127.0.0.1是表示本机地址
s.connect(('127.0.0.1',9999))

# 3接受消息,每次最多接受1k字节
print(s.recv(1024).decode('utf-8'))
for data in [b'Michael', b'Tracy', b'Sarah']:
    #4发送消息
    s.send(data)
    print(s.recv(1024).decode('utf-8'))

s.send(b'exit')
s.close()

• 服务端

import socket, threading, time
#1.创建socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

#2.监听端口,listen参数代表传入的参数指定等待连接的最大数量
s.bind(('127.0.0.1', 9999))
s.listen(5)

print('waiting for connection')

def tcplink(sock, addr):
    print('Accept new connection from %s:%s...' % addr)
    sock.send(b'Welcome')
    while True:
        data = sock.recv(1024)
        time.sleep(1)
        #如果客户端发送exit字符串，就关闭连接
        if not data or data.decode('utf-8') == 'exit':
            break
        sock.send(('Hello, %s!' % data.decode('utf-8')).encode('utf-8'))
    sock.close()
    print('connection from %s:%s closed' % addr)

while True:
    #3.接受一个新连接
    sock, addr = s.accept()
    #4.创建新线程来处理TCP连接
    t = threading.Thread(target=tcplink, args=(sock, addr))
    t.start()

UDP

• 客户端

import socket
# 1.创建一个socket,AF_INET代表IPv4
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
for data in [b'Michael', b'Tracy', b'Sarah']:
    #4发送消息
    s.sendto(data,('127.0.0.1', 9999))
    print(s.recv(1024).decode('utf-8'))

s.close()

• 服务端

import socket, threading, time
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.bind(('127.0.0.1', 9999))

print('waiting for connection')


while True:
    data, addr = s.recvfrom(1024)
    print('Received from %s:%s' % addr)
    s.sendto(b'hello,%s' % data, addr )