python之web框架(1)：完成静态页面web服务器

python的web框架(1)

1.首先写一个最简单的web服务器，只能给客户回应一个固定的hello world的页面。

from socket import *
from multiprocessing import Process

def deal(conn):
    recv_data = conn.recv(1024).decode('gb2312')
    print(recv_data)
    conn.send('HTTP/1.1 200 OK \r\n\r\n <h1>hello world</h1>'.encode('gb2312'))

def main():
    s = socket(AF_INET, SOCK_STREAM)
    s.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)
    s.bind(('',8000))
    s.listen(1023)

    while 1:
        conn, user_info = s.accept()
        print(user_info)
        p = Process(target=deal, args=(conn,))
        p.start()
        conn.close()

if __name__ == '__main__':
    main()

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2.根据用户请求的页面，打开页面文件，读取，并回复给用户，完成多进程web静态页面服务器

#!/usr/bin/env python3
# coding:utf-8

from socket import *
from multiprocessing import Process

def deal(conn):
    recv_data = conn.recv(1024).decode('gb2312')
    recv_data_head = recv_data.splitlines()[0]
    print('------', recv_data_head)
    request_method, request_path, http_version = recv_data_head.split()

    # 去掉url中的?和之后的参数
    request_path = request_path.split('?')[0]

    if request_path == '/':
        request_path = '/index.html'
    file_name = "." + request_path
    try:
        f = open(file_name, 'rb')
    except IOError:
        conn.send(b'HTTP/1.1 404 ERROR \r\n\r\n <h1>Page is not exsit .</h1>')
        return

    read_data = f.read()
    send_data = b'HTTP/1.1 200 OK \r\n\r\n' + read_data
    conn.send(send_data)
    f.close()

def main():
    s = socket(AF_INET, SOCK_STREAM)
    s.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)
    s.bind(('',8000))
    s.listen(1023)

    while 1:
        conn, user_info = s.accept()
        print(user_info)
        p = Process(target=deal, args=(conn,))
        p.start()
        conn.close()  # 进程会复制出一个新的conn,所以这里的conn需要关闭

if __name__ == '__main__':
    main()

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3.为了方便操作，可以将之前的函数式编程改成面向对象编程。将所有的方法集成到一个类中，这样更加方便，也更易于使用者了解和使用。

#!/usr/bin/env python3
# coding:utf-8

from socket import *
from multiprocessing import Process

class MyWebServer(object):

    @staticmethod
    def deal(conn):
        recv_data = conn.recv(1024).decode('gb2312')
        recv_data_head = recv_data.splitlines()[0]
        print('------', recv_data_head)
        request_method, request_path, http_version = recv_data_head.split()

        # 去掉url中的?和之后的参数
        request_path = request_path.split('?')[0]

        if request_path == '/':
            request_path = '/index.html'
        file_name = "." + request_path

        try:
            f = open(file_name, 'rb')
        except IOError:
            conn.send(b'HTTP/1.1 404 ERROR \r\n\r\n <h1>Page is not exsit .</h1>')
            return

        read_data = f.read()
        send_data = b'HTTP/1.1 200 OK \r\n\r\n' + read_data
        conn.send(send_data)
        f.close()

    def __init__(self):
        self.s = socket(AF_INET, SOCK_STREAM)
        self.s.setsockopt(SOL_SOCKET, SO_REUSEADDR, 1)
        self.s.bind(('',8000))
        self.s.listen(1023)

    def start(self):
        while 1:
            conn, user_info = self.s.accept()
            print(user_info)
            p = Process(target=self.deal, args=(conn,))
            p.start()
            conn.close()  # 进程会复制出一个新的conn,所以这里的conn需要关闭

s = MyWebServer()
s.start()

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