4.2

1.基于多线程实现并发的套接字通信
server:

# -*- coding:utf-8 -*-
"""基于多线程实现并发的套接字通信"""
"""有一个致命的问题，不能无限的开线程，机器会卡死了"""
import socket
from threading import Thread

def task(conn):
    while True:
        try:
            data = conn.recv(1024)
            if not data: continue
            conn.send(data.upper())
        except Exception:
            break
    conn.close()

def server(ip,port):
    server = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
    server.bind((ip,port))
    server.listen(5)
    while True:
        conn,addr = server.accept()
        t = Thread(target=task,args=(conn,))
        t.start()
    server.close()

if __name__ == "__main__":
    server('127.0.0.1',8080)

"""应该将线程控制在一定的数量"""
"""
进程池：。。。 io阻塞不用进程池了
线程池：。。。
"""
"""基于线程池实现："""
import socket
from threading import Thread,Semaphore
from concurrent.futures import ThreadPoolExecutor

def task(conn):
    # sm.acquire()
    while True:
        try:
            data = conn.recv(1024)
            if not data: break
            conn.send(data.upper())
        except Exception:
            break
    conn.close()
    # sm.release()

def server(ip,port):
    server = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
    server.bind((ip,port))
    server.listen(5)
    while True:
        conn,addr = server.accept()
        pool.submit(task,conn)
        # t = Thread(target=task, args=(conn,))
        # t.start()
    server.close()


if __name__ == "__main__":
    pool = ThreadPoolExecutor(2)  # 随着机器性能不同而不同  一般用 线程池 不用 信号量
    # sm = Semaphore(2)
    server('127.0.0.1',8080)

client:

import socket

client = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
client.connect(('127.0.0.1',8080))
while True:
    msg = input(">>>:").strip()
    if not msg:continue
    client.send(msg.encode('utf-8'))
    data = client.recv(1024)
    print(data.decode('utf-8'))

2.编写一个简单的文本处理工具，具备三个任务，一个接收用户输入，一个将用户输入的内容格式化成大写，一个将格式化后的结果存入文件

from threading import Thread
import json
import time

def save(msg_upper):
    with open('db.txt','a',encoding='utf-8') as f:
        json.dump(msg_upper,f)

def handle(msg):
    time.sleep(10)
    msg_upper = msg.upper()
    p2 = Thread(target=save,args=(msg_upper,))
    p2.start()

def recv():
    while True:
        msg = input('>>>:').strip()
        p1 = Thread(target=handle, args=(msg,))
        p1.start()

if __name__ == "__main__":
    recv()