Erlang发送HTTP请求(Get,Post)

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在开发项目Erlang程序项目中 , 用到了HTTP请求 , 主要是Get和Post , 其他的类似Put和Post请求模式一样 ; 现将代码总结如下 :

发送HTTP-Get请求

inets:start(),
ReqUrl = string:join(["http://www.example.com/user?access=",binary_to_list(Access)],""),
RstGet = httpc:request(ReqUrl ),
inets:stop(),case  RstGet of{ok, {_,_,RstBody}} ->RstBody;  {error, Cause} ->Cause
end;

发送HTTP-Post请求

inets:start(),
ReqUrl = string:join(["http://www.example.com/access=",binary_to_list(Access)],""),
ParaStr = io_lib:format("phone=~s&vcode=~s",[Phone, Vcode]),
RegUsr = httpc:request(post,{ApiUrl, [],"application/x-www-form-urlencoded", list_to_binary(ParaStr)},[],[]),
inets:stop(),case  RstGet of{ok, {_,_,RstBody}} ->RstBody;  {error, Cause} ->Cause
end;

发送HTTP-Post请求 , 上传文件

format_multipart_formdata(Boundary, Fields, Files) ->
% 遍历字符参数FieldParts = lists:map(fun({FieldName, FieldContent}) ->[lists:concat(["--", Boundary]),lists:concat(["Content-Disposition: form-data; name=\"",atom_to_list(FieldName),"\""]),"", FieldContent]end, Fields),
FieldParts2 = lists:append(FieldParts),% 遍历文件参数
FileParts = lists:map(fun({FieldName, FileName, FileContent}) ->[lists:concat(["--", Boundary]),lists:concat(["Content-Disposition: form-data; name=\"",atom_to_list(FieldName),"\"; filename=\"",FileName,"\""]),lists:concat(["Content-Type: ", "application/octet-stream"]), "", FileContent]end, Files),
FileParts2 = lists:append(FileParts),
EndingParts = [lists:concat(["--", Boundary, "--"]), ""],
Parts = lists:append([FieldParts2, FileParts2, EndingParts]),
string:join(Parts, "\r\n").--- Usage:{ok,BinStream} = file:read_file("./images/avatar.png"),
Data = binary_to_list(BinStream), 
Boundary = "------WebKitFormBoundaryUscTgwn7KiuepIr1",
ReqBody = format_multipart_formdata(Boundary, [{uid,"123"}], [{avatar, "avatar", Data}]),
ContentType = lists:concat(["multipart/form-data; boundary=", Boundary]),
ReqHeader = [{"Content-Length", integer_to_list(length(ReqBody))}],inets:start(),
ParaUrl = string:join(["http://www.example.com/avatar?access_token=",binary_to_list(token)],""),
RstGet = httpc:request(post,{ParaUrl, ReqHeader,ContentType, ReqBody},[],[])
inets:stop(),case  RstGet of{ok, {_,_,RstBody}} ->RstBody;  {error, Cause} ->Cause
end;

参考资料: how to http:post file with httpc:request in erlang?

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