Erlang实现的一个Web服务器代码实例

脚本专栏 2024/12/25 佚名

3 2 1

转贴一个简单的Web服务器：

httpd.erl

%% httpd.erl - MicroHttpd 
-module(httpd). 
-author("ninhenry@gmail.com"). 
 
-export([start/0,start/1,start/2,process/2]). 
-import(regexp,[split/2]). 
 
-define(defPort,8888). 
-define(docRoot,"public"). 
 
start() -> start("[ \r\n]"), 
 FileName = DocRoot ++ Name, 
 LogReq = Cmd ++ " " ++ Name ++ " " ++ Vers, 
 Resp = case file:read_file(FileName) of 
  {ok, Data} -> 
   io:format("~p ~p ok~n",[LogReq,FileName]), 
   Data; 
  {error, Reason} -> 
   io:format("~p ~p failed ~p~n",[LogReq,FileName,Reason]), 
   error_response(LogReq,file:format_error(Reason)) 
  end,  
 do_send(Sock,Resp), 
 gen_tcp:close(Sock). 
 
%% construct HTML for failure message 
error_response(LogReq,Reason) -> 
 "<html><head><title>Request Failed</title></head><body>\n" ++ 
 "<h1>Request Failed</h1>\n" ++ "Your request to " ++ LogReq ++ 
 " failed due to: " ++ Reason ++ "\n</body></html>\n". 
 
%% send a line of text to the socket 
do_send(Sock,Msg) -> 
 case gen_tcp:send(Sock, Msg) of 
  ok -> ok; 
   {error, Reason} -> exit(Reason) 
 end. 
 
%% receive data from the socket 
do_recv(Sock) -> 
 case gen_tcp:recv(Sock, 0) of 
  {ok, Bin} -> binary_to_list(Bin); 
   {error, closed} -> exit(closed); 
   {error, Reason} -> exit(Reason) 
 end

运行时在httpd.erl本地建一个public目录，public目录里放一个index.html文件
然后httpd:start()启动服务器，就可以访问http://localhost:8888/index.html了

Erlang,Web,服务器