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 ? 1 2 3 4 5 6 7 8 0 Comments

转贴一个简单的Web服务器：

httpd.erl

?

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%% 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) ->

case gen_tcp:listen(Port, [binary,{packet, 0},{active, false}]) of

{ok, LSock} -> server_loop(LSock,DocRoot);

{error, Reason} -> exit({Port,Reason})

end.

%% main server loop - wait for next connection, spawn child to process it

server_loop(LSock,DocRoot) ->

case gen_tcp:accept(LSock) of

{ok, Sock} ->

spawn(?MODULE,process,[Sock,DocRoot]),

server_loop(LSock,DocRoot);

{error, Reason} ->

exit({accept,Reason})

end.

%% process current connection

process(Sock,DocRoot) ->

Req = do_recv(Sock),

{ok,[Cmd|[Name|[Vers|_]]]} = split(Req,"[ \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

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