TCP编程

创建和运行TCP服务端的五个步骤

1、创建Socket,绑定Socket到本地IP与端口

2、开始监听连接

3、进入循环，不断接收客户端的连接请求

4、接收传来的数据，并发送给对方数据

5、传输完毕后，关闭Socket

例子：

import socket
import threading
import time


def dealClient(sock, addr):
    print('Accept new connection from %s:%s...' % addr)
    sock.send(b'Hello,I am server!')
    while True:
        data = sock.recv(1024)
        time.sleep(1)
        if not data or data.decode('utf-8') == 'exit':
            break
        print('--->>%s' % data.decode('utf-8'))
        sock.send(('Loop_Msg:%s!' % data.decode('utf-8')).encode('utf-8'))
    sock.close()
    print('Connection from %s:%s closed.' % addr)


if __name__ == '__main__':
    sockets = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sockets.bind(('127.0.0.1', 9999))
    sockets.listen(5)
    print('waiting for connection...')
    while True:
        sock, addr = sockets.accept()
        t = threading.Thread(target=dealClient, args=(sock, addr))
        t.start()

创建客户端的步骤

1、创建Socket，连接远程地址

2、连接后发送数据和接收数据

3、传输完毕后关闭socket

例子：

import socket

sockets = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sockets.connect(('127.0.0.1', 9999))
print('--->>' + sockets.recv(1024).decode('utf-8'))
sockets.send(b'Hello,I am a client.')
print('--->>' + sockets.recv(1024).decode('utf-8'))
sockets.send(b'exit')
sockets.close()

 

运行结果：

服务端：

waiting for connection...
Accept new connection from 127.0.0.1:55970...
--->>Hello,I am a client.
Connection from 127.0.0.1:55970 closed.

客户端：

--->>Hello,I am server!
--->>Loop_Msg:Hello,I am a client.!