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socket是什么

socket可以使两台机子建立连接，就像连接风扇与电源的插座一样，socket可以使服务端与客户端建立连接，服务端就像供电厂，而客户端就像用电器，而socket就是连接二者的插座。

建立简单的连接

1. 如果我们想在客户端与服务端建立连接收发数据就需要分别执行socket方法。
   

2. 服务端依次执行bind() linten() acctpt()

4. 客户端执行connect()请求与服务端连接
5. 之后服务端与客户端都可以执行send() recv()发送与接收消息

python实现

server

1. socket()
2. bind()绑定ip和端口
3. listen()监听
4. accept()等待连接。返回新的socket对象（用于收发数据）与addr（存有客户端IP与PORT）
5. send()/recv()
6. close()

import socketIP = '0.0.0.0'
PORT = 50000
BUF_LEN = 512listenSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)listenSocket.bind((IP, PORT))listenSocket.listen(5)
print('[*] Socket is listening..')
data, addr = listenSocket.accept()
print('[*] Got connection from', addr)
while True:received_data = data.recv(BUF_LEN)if not received_data:breakinfo = received_data.decode()print(f'[*] Received {info}')data.send(f'服务端收到消息{info}'.encode())data.close()
listenSocket.close()

client

1. socket()
2. connect()申请连接
3. send()/recv()
4. close()

import socketIP = '127.0.0.1'
PORT = 50000
BUFFER_SIZE = 512dataSocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)dataSocket.connect((IP, PORT))while True:toSend = input('Enter a message to send: ')if toSend == '':breakdataSocket.send(toSend.encode())receivedData = dataSocket.recv(BUFFER_SIZE)if not receivedData:breakprint(receivedData.decode())dataSocket.close()