• 背景

大多数情况下主机资源只有开发和测试相关人员可以登录直接操作，且有些特定情况“答辩、演示、远程”等这些场景下是无法直接登录主机的。web是所有终端用户都可以访问了，解决了人员权限与特定场景带来的问题。那么我们就来看看最简单的web服务器是怎么创建的~~

• 具体实现

首先搭建python环境，涉及问题请移步。python内建模块SimpleHTTPServer，源码如下路径是/usr/lib64/python2.6/SimpleHTTPServer.py，有兴趣可看看

1 """Simple HTTP Server.  2   3 This module builds on BaseHTTPServer by implementing the standard GET  4 and HEAD requests in a fairly straightforward manner.  5   6 """  7   8   9 __version__ = "0.6" 10  11 __all__ = ["SimpleHTTPRequestHandler"] 12  13 import os 14 import posixpath 15 import BaseHTTPServer 16 import urllib 17 import cgi 18 import sys 19 import shutil 20 import mimetypes 21 try: 22     from cStringIO import StringIO 23 except ImportError: 24     from StringIO import StringIO 25  26  27 class SimpleHTTPRequestHandler(BaseHTTPServer.BaseHTTPRequestHandler): 28  29     """Simple HTTP request handler with GET and HEAD commands. 30  31     This serves files from the current directory and any of its 32     subdirectories.  The MIME type for files is determined by 33     calling the .guess_type() method. 34  35     The GET and HEAD requests are identical except that the HEAD 36     request omits the actual contents of the file. 37  38     """ 39  40     server_version = "SimpleHTTP/" + __version__ 41  42     def do_GET(self): 43         """Serve a GET request.""" 44         f = self.send_head() 45         if f: 46             self.copyfile(f, self.wfile) 47             f.close() 48  49     def do_HEAD(self): 50         """Serve a HEAD request.""" 51         f = self.send_head() 52         if f: 53             f.close() 54  55     def send_head(self): 56         """Common code for GET and HEAD commands. 57  58         This sends the response code and MIME headers. 59  60         Return value is either a file object (which has to be copied 61         to the outputfile by the caller unless the command was HEAD, 62         and must be closed by the caller under all circumstances), or 63         None, in which case the caller has nothing further to do. 64  65         """ 66         path = self.translate_path(self.path) 67         f = None 68         if os.path.isdir(path): 69             if not self.path.endswith('/'): 70                 # redirect browser - doing basically what apache does 71                 self.send_response(301) 72                 self.send_header("Location", self.path + "/") 73                 self.end_headers() 74                 return None 75             for index in "index.html", "index.htm": 76                 index = os.path.join(path, index) 77                 if os.path.exists(index): 78                     path = index 79                     break 80             else: 81                 return self.list_directory(path) 82         ctype = self.guess_type(path) 83         try: 84             # Always read in binary mode. Opening files in text mode may cause 85             # newline translations, making the actual size of the content 86             # transmitted *less* than the content-length! 87             f = open(path, 'rb') 88         except IOError: 89             self.send_error(404, "File not found") 90             return None 91         self.send_response(200) 92         self.send_header("Content-type", ctype) 93         fs = os.fstat(f.fileno()) 94         self.send_header("Content-Length", str(fs[6])) 95         self.send_header("Last-Modified", self.date_time_string(fs.st_mtime)) 96         self.end_headers() 97         return f 98  99     def list_directory(self, path):100         """Helper to produce a directory listing (absent index.html).101 102         Return value is either a file object, or None (indicating an103         error).  In either case, the headers are sent, making the104         interface the same as for send_head().105 106         """107         try:108             list = os.listdir(path)109         except os.error:110             self.send_error(404, "No permission to list directory")111             return None112         list.sort(key=lambda a: a.lower())113         f = StringIO()114         displaypath = cgi.escape(urllib.unquote(self.path))115         f.write('')116         f.write("\n\n" % displaypath)117         f.write("\n
Directory listing for %s
\n" % displaypath)118         f.write("
      
\n
      
       \n")119         for name in list:120             fullname = os.path.join(path, name)121             displayname = linkname = name122             # Append / for directories or @ for symbolic links123             if os.path.isdir(fullname):124                 displayname = name + "/"125                 linkname = name + "/"126             if os.path.islink(fullname):127                 displayname = name + "@"128                 # Note: a link to a directory displays with @ and links with /129             f.write('
       
%s\n'130                     % (urllib.quote(linkname), cgi.escape(displayname)))131         f.write("
      
\n
      
\n\n\n")132         length = f.tell()133         f.seek(0)134         self.send_response(200)135         encoding = sys.getfilesystemencoding()136         self.send_header("Content-type", "text/html; charset=%s" % encoding)137         self.send_header("Content-Length", str(length))138         self.end_headers()139         return f140 141     def translate_path(self, path):142         """Translate a /-separated PATH to the local filename syntax.143 144         Components that mean special things to the local file system145         (e.g. drive or directory names) are ignored.  (XXX They should146         probably be diagnosed.)147 148         """149         # abandon query parameters150         path = path.split('?',1)[0]151         path = path.split('#',1)[0]152         path = posixpath.normpath(urllib.unquote(path))153         words = path.split('/')154         words = filter(None, words)155         path = os.getcwd()156         for word in words:157             drive, word = os.path.splitdrive(word)158             head, word = os.path.split(word)159             if word in (os.curdir, os.pardir): continue160             path = os.path.join(path, word)161         return path162 163     def copyfile(self, source, outputfile):164         """Copy all data between two file objects.165 166         The SOURCE argument is a file object open for reading167         (or anything with a read() method) and the DESTINATION168         argument is a file object open for writing (or169         anything with a write() method).170 171         The only reason for overriding this would be to change172         the block size or perhaps to replace newlines by CRLF173         -- note however that this the default server uses this174         to copy binary data as well.175 176         """177         shutil.copyfileobj(source, outputfile)178 179     def guess_type(self, path):180         """Guess the type of a file.181 182         Argument is a PATH (a filename).183 184         Return value is a string of the form type/subtype,185         usable for a MIME Content-type header.186 187         The default implementation looks the file's extension188         up in the table self.extensions_map, using application/octet-stream189         as a default; however it would be permissible (if190         slow) to look inside the data to make a better guess.191 192         """193 194         base, ext = posixpath.splitext(path)195         if ext in self.extensions_map:196             return self.extensions_map[ext]197         ext = ext.lower()198         if ext in self.extensions_map:199             return self.extensions_map[ext]200         else:201             return self.extensions_map['']202 203     if not mimetypes.inited:204         mimetypes.init() # try to read system mime.types205     extensions_map = mimetypes.types_map.copy()206     extensions_map.update({207         '': 'application/octet-stream', # Default208         '.py': 'text/plain',209         '.c': 'text/plain',210         '.h': 'text/plain',211         '.log':'text/plain',212         '.out':'text/plain',213         '.sql':'text/plain',214         '.conf':'text/plain'215         })216 217 218 def test(HandlerClass = SimpleHTTPRequestHandler,219          ServerClass = BaseHTTPServer.HTTPServer):220     BaseHTTPServer.test(HandlerClass, ServerClass)221 222 223 if __name__ == '__main__':224     test()

使用方式如下：

1. 明确需要展示web的根目录，比如/user/src
2. 了解SimpleHTTPServer模块的几个关键参数，只说一下web服务的启动端口port。比如python -m SimpleHTTPServer port
3. 修改一下源码web说明和支撑多种文件格式等等：

 

最后，启动web服务器：

python -m SimpleHTTPServer 8009

 小建议，一般web服务都是常驻进程，这里建议也设置为常驻进程或者添加为linux系统服务。

• 结果展示：