Golang three ways to parse HTTP Multipart/form

Multipart/form-data, as the name implies, can upload multiple form-data and split it with separators for file uploads.

1. HTTP Multipart/form-data Request sample

Post/handle http/1.1

host:localhost:8080

Connection:keep-alive

content-length:182537

Cache-control:max-age=0

Content-type:multipart/form-data; boundary=----Webkitformboundarywddae6hxfa4nl2ig

accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8

Accept-encoding:gzip, deflate, BR

accept-language:zh-cn,zh;q=0.9

------Webkitformboundarywddae6hxfa4nl2ig

Content-disposition:form-data; Name= "Submit-name"

Jack

------Webkitformboundarywddae6hxfa4nl2ig

Content-disposition:form-data; Name= "File1"; Filename= "Out.png"

Content-type:image/png

Binary-data

------Webkitformboundarywddae6hxfa4nl2ig

Content-disposition:form-data; Name= "File2"; Filename= "2.png"

Content-type:image/png

Binary-data-2

------webkitformboundarywddae6hxfa4nl2ig--

2. Golang Parsing Example

Package Main

Import (

"Bytes"

"Net/http"

"Io/ioutil"

"FMT"

"Mime/multipart"

"IO"

)

Func Main () {

Bodybuf: = bytes. Newbuffer (Nil)

Bodybuf.writestring ('------webkitformboundarywddae6hxfa4nl2ig

Content-disposition:form-data; Name= "Submit-name"

Xiongwei

------Webkitformboundarywddae6hxfa4nl2ig

Content-disposition:form-data; Name= "File1"; Filename= "Out.png"

Content-type:image/png

Binary-data

------Webkitformboundarywddae6hxfa4nl2ig

Content-disposition:form-data; Name= "File2"; Filename= "2.png"

Content-type:image/png

Binary-data-2

------webkitformboundarywddae6hxfa4nl2ig--')

Req: = &http. request{

Method: "POST",

Header:http. header{"Content-type": {' multipart/form-data; boundary=----Webkitformboundarywddae6hxfa4nl2ig '}},

Body:ioutil. Nopcloser (BODYBUF),

}

GETMULTIPART3 (req)

}

Through R. Parsemultipartform

Func GetMultiPart1 (R *http. Request) {

/**

The underlying is parsed by calling Multipartreader.readform.

If the file size exceeds maxmemory, a temporary file is used to store the file data in the Multipart/form

*/

R.parsemultipartform (128)

Fmt. Println ("R.form:", R.form)

Fmt. Println ("R.postform:", R.postform)

Fmt. Println ("R.multipartform:", R.multipartform)

Getformdata (R.multipartform)

}

by Multipartreader

Func GetMultiPart2 (R *http. Request) () {

Mr,err: = R.multipartreader ()

If Err! = nil{

Fmt. Println ("R.multipartreader () Err,", err)

Return

}

form, _: = Mr. Readform (128)

Getformdata (Form)

}

BYTE parsing multi-part

Func GetMultiPart3 (R *http. Request) () {

Mr,err: = R.multipartreader ()

If Err! = nil{

Fmt. Println ("R.multipartreader () Err,", err)

Return

}

for{

P, Err: = Mr. Nextpart ()

If err = = Io. eof{

Break

}

If Err! = nil{

Fmt. Println ("Mr. Nextpart () Err, ", err)

Break

}

Fmt. Println ("Part header:", P.header)

FormName: = P.formname ()

FileName: = P.filename ()

If formName! = "" && fileName = = "" {

Formvalue,_:= Ioutil. ReadAll (P)

Fmt. Printf ("formname:%s,formvalue:%s\n", Formname,formvalue)

}

If fileName! = "" {

Filedata,_:=ioutil. ReadAll (P)

Fmt. Printf ("filename:%s,filedata:%s\n", Filename,filedata)

}

Fmt. Println ()

}

}

Func getformdata (Form *multipart. Form) {

Gets the form value in the Multi-part/form body

For k,v: = Range form. value{

Fmt. Println ("Value,k,v =", K, ",", V)

}

Fmt. Println ()

Get the file data in Multi-part/form

For _,v: = Range form. File {

for i:=0; i < Len (v); i++{

Fmt. Println ("File part", I, "--")

Fmt. Println ("FileName:", V[i]. Filename)

Fmt. Println ("Part-header:", V[i]. Header)

F,_: = V[i]. Open ()

Buf,_:= Ioutil. ReadAll (f)

Fmt. Println ("File-content", String (BUF))

Fmt. Println ()

}

}

}

Golang three ways to parse HTTP Multipart/form