Erlang实现的一个Web服务器代码实例
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(?defPort,?docRoot).
start(Port)->start(Port,?docRoot).
start(Port,DocRoot)->
casegen_tcp:listen(Port,[binary,{packet,0},{active,false}])of
{ok,LSock}->server_loop(LSock,DocRoot);
{error,Reason}->exit({Port,Reason})
end.
%%mainserverloop-waitfornextconnection,spawnchildtoprocessit
server_loop(LSock,DocRoot)->
casegen_tcp:accept(LSock)of
{ok,Sock}->
spawn(?MODULE,process,[Sock,DocRoot]),
server_loop(LSock,DocRoot);
{error,Reason}->
exit({accept,Reason})
end.
%%processcurrentconnection
process(Sock,DocRoot)->
Req=do_recv(Sock),
{ok,[Cmd|[Name|[Vers|_]]]}=split(Req,"[\r\n]"),
FileName=DocRoot++Name,
LogReq=Cmd++""++Name++""++Vers,
Resp=casefile:read_file(FileName)of
{ok,Data}->
io:format("~p~pok~n",[LogReq,FileName]),
Data;
{error,Reason}->
io:format("~p~pfailed~p~n",[LogReq,FileName,Reason]),
error_response(LogReq,file:format_error(Reason))
end,
do_send(Sock,Resp),
gen_tcp:close(Sock).
%%constructHTMLforfailuremessage
error_response(LogReq,Reason)->
"<html><head><title>RequestFailed</title></head><body>\n"++
"<h1>RequestFailed</h1>\n"++"Yourrequestto"++LogReq++
"faileddueto:"++Reason++"\n</body></html>\n".
%%sendalineoftexttothesocket
do_send(Sock,Msg)->
casegen_tcp:send(Sock,Msg)of
ok->ok;
{error,Reason}->exit(Reason)
end.
%%receivedatafromthesocket
do_recv(Sock)->
casegen_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