HTTP_AAE POST - Build Payload

Hello,

I need to deliver excaltly this message with HTTP_AAE Receriver Adapter:

HEADER---->

Content-Type: multipart/form-data; boundary=---------------------------985513245641212

BODY----->

-----------------------------985513245641212

Content-Disposition: form-data; name="user"

30999999996

-----------------------------985513245641212

Content-Disposition: form-data; name="password"

99999999

-----------------------------985513245641212

Content-Disposition: form-data; name="file"; filename="TB_30999999996_003002_20130101_000001.txt"

Content-Type: text/plain

01|30999999996

02|30999999996

-----------------------------985513245641212--

Java Mapping? Function Module? UDF??

Examples???

Thanks