Python实现简易版的Web服务器(推荐)

下面给大家介绍python实现简易版的web服务器，具体内容详情大家通过本文学习吧！

1、请自行了解HTTP协议

https://www.jb51.net/article/133883.htm（点击跳转）

2、创建Socket服务，监听指定IP和端口

3、以阻塞方式等待客户端连接

4、读取客户端请求数据并进行解析

5、准备服务器运行上下文

6、处理客户端请求数据

7、根据用户请求路径读取文件

8、返回响应结果给客户端

9、程序入口

10、目录结构

11、运行

python wsgiserver.py app:run

12、源码

a.wsgiserver.py文件

#encoding:utf-8
import socket
import StringIO
import sys
import logging
from datetime import datetime
logger = logging.getLogger(__name__)
class WSGIServer(object):
address_family = socket.AF_INET
socket_type = socket.SOCK_STREAM
request_queue_size = 30
recv_size = 1024
def __init__(self, server_address):
 self._listen_socket = _listen_socket = socket.socket(self.address_family,
              self.socket_type)  _listen_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR,1)  _listen_socket.bind(server_address)
 _listen_socket.listen(self.request_queue_size)  
 _host, _port = _listen_socket.getsockname()
 self._server_name = socket.getfqdn(_host)
 self._server_port = _port
 self._headers_set = []
 self._application = None
 self._client = None
 self._request_data = None
 self._request_method = None
 self._path = None
 self._request_version = None
 self._start_response = None
def set_application(self, application):
 self._application = application
def server_forever(self):
 _listen_socket = self._listen_socket
 logger.info('listen on ％s:％s', self._server_name, self._server_port)  while 1:  
  try:
   self._client, _addr = _listen_socket.accept()
   self._handle_request(_addr)
  except KeyboardInterrupt as e:
   logger.info('interrupt')
   break
  except BaseException as e:
   logger.error(e)
def _handle_request(self, client_addr):
 self._request_data = _request_data = self._client.recv(self.recv_size)
 self._parse_request_data(_request_data)  
 _env = self._get_environment(client_addr)
 _result = self._application(_env, self.start_response)
 self._finish_response(_result)
def _parse_request_data(self, request_data):
 _request_line = str(request_data.splitlines()[0]).rstrip('\r\n')
 (self._request_method, self._path, self._request_version) = _request_line.split()
def _get_environment(self, client_addr):  
 _env = {}  
 _env['wsgi.version'] = (1, 0)  
 _env['wsgi.url_scheme'] = 'http'
 _env['wsgi.input'] = StringIO.StringIO(self._request_data)    _env['wsgi.errors'] = sys.stderr  
 _env['wsgi.multithread'] = False
 _env['wsgi.multiprocess'] = False
 _env['wsgi.run_once'] = False
 _env['REQUEST_METHOD'] = self._request_method.upper()  
 _env['PATH_INFO'] = self._path
 _env['SERVER_NAME'] = self._server_name
 _env['SERVER_PORT'] = self._server_port
 _env['HTTP_CLIENT_IP'] = client_addr[0]
 logger.info('％s ％s ％s ％s', _env['HTTP_CLIENT_IP'], datetime.now().strftime('％Y-％m-％d ％H:％M:％S'), _env['REQUEST_METHOD'], _env['PATH_INFO'])
 return _env
def start_response(self, status, response_headers, exc_info=None):   _server_headers = [
  ('Date', 'Sun, 7 Jun 2015 23:07:04 GMT'),
  ('Server', 'WSGIServer 0.1')
  ]
 self._headers_set = [status, response_headers + _server_headers]
def _finish_response(self, result):  
 _status, _response_headers = self._headers_set
 _response = 'HTTP/1.1 {status}\r\n'.format(status=_status)    for _header in _response_headers:  
 _response += '{0}:{1}\r\n'.format(*_header)  
 _response += '\r\n'
 for _data in result:  
  _response += _data
 self._client.sendall(_response)
 self._client.close()
def make_server(server_address, application):
server = WSGIServer(server_address)
server.set_application(application)
return server
if __name__ == '__main__':
logging.basicConfig(level=logging.DEBUG)
server_addr= ('0.0.0.0', 43002)
app_path = sys.argv[1]
module, application = app_path.split(':')
module = __import__(module)
application = getattr(module, application)
httpd = make_server(server_addr, application)
httpd.server_forever()

b.app.py文件

#encoding:utf-8
import os
class PageNotFoundException(BaseException):
pass
def render(filename, dirname='html'):
_path = os.path.join(dirname, filename)
if os.path.exists(_path):  
 with open(_path, 'rb') as handler:  
  return handler.read()
raise PageNotFoundException('file not found:％s' ％ _path)
def run(env, start_response):
_path = env.get('PATH_INFO')
response = ''
try:
 _path = 'index.html' if _path == '/' else _path[1:]
 if _path.endswith('.css'):
  start_response('200 OK', [('Content-Type', 'text/css')])
 elif _path.endswith('.js'):
  start_response('200 OK', [('Content-Type', 'text/javascript')]
 elif _path.endswith('.html'):
  start_response('200 OK', [('Content-Type', 'text/html')])
 else:
  start_response('200 OK', [('Content-Type', 'text/plain'), ('Content-Disposition', 'attachment; filename=％s' ％ os.path.basename(_path))])
 response = render(_path)
except PageNotFoundException as e:
 response = render('404.html')
return [response, '\r\n']

总结

以上所述是小编给大家介绍的Python实现简易版的Web服务器网站的支持！

来源：https://www.cnblogs.com/reboot51/p/8375979.html