python网络编程--多线程

 一：多线程网络编程

　　模板：

import socketserver
 
class MyServer(socketserver.BaseRequestHandler):
    def handle(self):
        pass
 
server = socketserver.ThreadingTCPServer(('192.168.13.84',8001,),MyServer)
server.serve_forever()

 

案例：多线程

1 import socketserver
 2 
 3 class Myserver(socketserver.BaseRequestHandler):
 4     def handle(self):# 方法名是固定的

 5         # 字节类型    #self.request等价于conn
 6         while 1:
 7             # 针对window系统
 8             try:
 9                 print("等待信息")
10                 data = self.request.recv(1024)  # 阻塞
11                 # 针对linux
12                 if len(data) == 0:
13                     break
14                 if data == b'exit':
15                     break
16                 response = data + b'SB'
17                 self.request.send(response)
18             except Exception as e:
19                 break
20 
21         self.request.close()
22 
23 
24 # 1 创建socket对象 2 self.socket.bind()  3 self.socket.listen(5)
25 server=socketserver.ThreadingTCPServer(("127.0.0.1",8899),Myserver)
26 
27 server.serve_forever()  # 用于   accept() 等待连接

 客户端

import socket

sk = socket.socket()

sk.connect(('127.0.0.1',8899))

while 1:
    name = input(">>>>：")
    sk.send(name.encode('utf-8')) # 字节

    response = sk.recv(1024) # 字节
    print(response.decode('utf-8'))

 

二：多线程网络编程

案例1：

#多线程
import threading
import time

def task(a1,a2,a3):
    time.sleep(2)
    print('拿快递')
def play():
    print('和女朋友去耍')
def wm():
    print('去拿外卖')

# 创建一个线程
# 让该线程去执行任务：函数
t1 = threading.Thread(target=task,args=(1,2,3,))   # args=(1,2,3,)对应task中的参数
# 去执行吧
t1.start()


# 创建一个线程
# 让该线程去执行任务：函数
t2 = threading.Thread(target=play)
# 去执行吧
t2.start()

# 创建一个线程
# 让该线程去执行任务：函数
t3 = threading.Thread(target=wm)
# 去执行吧
t3.start()

print('玩扇子')
print('煽风点火')
print('耍贱...')

#3个子线程1个主线程

 

 

案例2：

import time

  import threading

  

  def task(n):

    print('开始执行任务:',n)

    time.sleep(10)

    print('...')

    print('任务%s 执行完毕:'%n)

  

  while True:

    name = input("请输入任务：")

    t = threading.Thread(target=task,args=(name,))

    t.start()

 

案例3：线程与socket

import time

import socket

import threading

 

def task(conn):

    time.sleep(20)

    data = conn.recv(1024)

    print(data)

    conn.close()

 

server = socket.socket()

server.bind(('192.168.13.84',8001,))

server.listen(5)

 

while True:

    conn,addr = server.accept()

    t = threading.Thread(target=task,args=(conn,))

    t.start()

 

案例4：利用requests/uuid第三方模块从网站上下载多个图片

 

# 案例3：利用requests第三方模块从网站上下载多个图片
'''
pip3 install requests
'''

import threading
import requests
import uuid   #随机生成字符串
url_list = [
            'https://img01.sogoucdn.com/app/a/100520024/924055f74736446fb5253068062585c0',
            'https://img01.sogoucdn.com/app/a/100520024/f4d580ab0d9f5d514c9471b23bba0561',
            ]
def task(url):
    """
        1. DNS解析，根据域名解析出IP
        2. 创建socket客户端    sk = socket.socket()
        3. 向服务端发起连接请求 sk.connect()
        4. 发送数据（我要图片） sk.send(...)
        5. 接收数据            sk.recv(8096)

        接收到数据后写入文件。
        """
    ret = requests.get(url)
    file_name = str(uuid.uuid4()) + '.jpg'
    with open(file_name,mode='wb') as f:
        f.write(ret.content)

for url in url_list:
    t = threading.Thread(target=task,args=(url,))
    t.start()