Hybrid form upload using the socket to simulate HTTP (submit a form in one request and upload multiple files)

?????? In very many enterprise applications, we are not able to simulate HTTP composite forms (Multipart/form-data) directly through the development of language SDK package-encapsulated HTTP tools, especially during cross-language cross-platform programming. In fact, the implementation is not complicated, just to understand the HTTP protocol in the composite form of the message structure is very easy:

? ?????? Httpheader

??????? ------Time Stamp------

??????? Form Parameters 1

?????? ------Time Stamp------

?????? Form Parameters 2

????? ------Time Stamp------

????? Descriptive narrative of document 1 + binary information

???? ------Time Stamp------

???? Descriptive narrative of document 2 + binary information

?

??? Below we further illustrate this structure with a C # generation code:

???????

??????? /// <summary>

??????? /// send mixed request to server, 1: Send successfully, 0: Send failed

??????? /// </summary>

??????? /// <param name= "paranames" > Form array of the names of the parameters </param>

??????? /// <param name= "Paravalues" > array of participating values </param>

??????? /// <param name= "Files" > array of file names </param>

???????///<param name= "errmsg" > Error message </param>

??????? /// <returns></returns>

??????? Public int SendRequest (string[] paranames, string[] paravalues, string[] files, ref String errmsg)

??????? {

??????????? StringBuilder http, text;

??????????? byte [] httpbyte;

??????????? byte [] Textbyte = null;

??????????? long length = 0;

??????????? datetime now = datetime. Now;

??????????? list<byte[]> data =newList<byte[]> ();

??????????? //Construction time Stamp

??????????? string strboundary = "------------" + DateTime. Now.Ticks.ToString ("x");

??????????? byte [] boundary = Encoding. Ascii. GetBytes ("\ r \ n" + strboundary +"\ r \ n");

??????????? Length + = boundary. Length;

??????????? //Construction time Stamp

?

??????????? // Load form parameter information

??????????? if (paranames! = null)

??????????? {

??????????????? Text = new StringBuilder();

??????????????? for (int i = 0; i < Paranames. Length; i++)

??????????????? {

??????????????????? Text. Append ("--");

??????????????????? Text. Append (strboundary);// Add time stamp

??????????????????? Text. Append ("\ r \ n");

??????????????????? Text. Append ("content-disposition:form-data; Name=\ "" + paranames[i] +"\" \r\n\r\n ");

??????????????????? Text. Append (Paravalues[i]);

??????????????????? Text. Append ("\ r \ n");

??????????????? }

??????????????? string para = text. ToString ();

??????????????? Textbyte = Encoding. Ascii. GetBytes (para);

??????????????? Length + = Textbyte. Length;

??????????? }

?

??????????? // Loading File Information

??????????? if (Files = null)

??????????? {

??????????????? for (int i = 0; i < files.) Length; i++)

??????????????? {

??????????????????? FileStream FS;

??????????????????? StringBuilder sbfile =newStringBuilder();

??????????????????? Try

??????????????????? {

??????????????????????? FS = File. Open (Files[i],FileMode. Open,fileaccess. Read,fileshare. Read);

??????????????????????? if (i = = 0) sbfile. Append ("--"); // Add to File

??????????????????????? Else Sbfile. Append ("\r\n--");

??????????????????????? Sbfile. Append (strboundary);// add timestamp???????????????????????

??????????????????????? Sbfile. Append ("\ r \ n");

??????????????????????? Sbfile. Append ("content-disposition:form-data; Name=\ "");

??????????????????????? Sbfile. Append ("file");

??????????????????????? Sbfile. Append ("\"; filename=\ "");

??????????????????????? Sbfile. Append (Path. GetFileName (Files[i]));

??????????????????????? Sbfile. Append ("\" ");

?????????????????????? ? sbfile. Append ("\ r \ n");

??????????????????????? Sbfile. Append ("Content-type:");

??????????????????????? Sbfile. Append ("Application/octet-stream");

??????????????????????? Sbfile. Append ("\r\ncontent-length:");

??????????????????????? Sbfile. Append (fs. Length.tostring ());

??????????????????????? Sbfile. Append ("\ r \ n");

??????????????????????? Sbfile. Append ("\ r \ n");

??????????????????????? string temp = sbfile. ToString ();

??????????????????????? byte [] bin =Encoding. UTF8. GetBytes (temp);

??????????????????????? Data. Add (BIN);

??????????????????????? Length + = bin. Length;

??????????????????????? Length + = fs. Length;

??????????????????????? Fs. Close ();

??????????????????? }

??????????????????? Catch (Exception exc)

??????????????????? {

??? ???????????????????? ErrMsg = exc. Message.tostring ();

??????????????????????? return 0;

??????????????????? }

?

??????????????? }

??????????? }

?

??????????? //Construct HTTP Head

??????????? HTTP = new StringBuilder();

??????????? http. Append ("POST" + Ur. ToString () +"http/1.1\r\n");

??????????? http. Append ("content-type:multipart/form-data;boundary=");

??????????? http. Append (strboundary);

??????????? http. Append ("\ r \ n");

??????????? http. Append ("Host:" + ipaddress +":" + TCPPort. ToString () +"\ r \ n");

??????????? http. Append ("content-length:");

??????????? http. Append (length. ToString ());

??????????? http. Append ("\ r \ n");

??????????? http. Append ("expect:100-continue\r\n"); //Note to continue uploading the HTTP message body after receiving the continue message from the server

??????????? http. Append ("connection:keep-alive\r\n\r\n");

??????????? string strtemp = http. ToString ();

??????????? Httpbyte = Encoding. Ascii. GetBytes (strtemp);

?

??????????? Try

??????????? {

??????????????? Soc. Send (Httpbyte); " //Send HTTP headers first ????????????

????????????? ? Thread. Sleep (100);

??????????????? string check = GetResponse ();

??????????????? if (check = = Null | |!check. Contains ("Continue"))//Receive server confirmation before continuing uploading

??????????????? {

??????????????????? ErrMsg = "Theclient has successfully sent the request, but the server is not responding." ";

??????????????????? return 0;

??????????????? }

??????????????? if (paranames! = null)

??????????????? {

??????????????????? Soc. Send (Textbyte, Textbyte. Length, SocketFlags. None); //Send form Parameters

??????????????? }

??????????????? if (Files = null)

??????????????? {//send file in sequence

??????????????????? for (int i = 0; i < data.) Count; i++)

??????????????????? {

??????????????????????? int size = 0;

??????????????????????? FileStream fs =File. Open (Files[i],FileMode. Open,fileaccess. Read,fileshare. Read);

??????????????????????? Soc. Send (Data[i], data[i]. Length, SocketFlags. None);

??????????????????????? byte [] buff =newbyte[1024];

??????????????????????? Size = fs. Read (buff, 0, 1024);

??????????????????????? while (Size > 0)

??????????????????????? {

??????????????????????????? Soc. Send (buff, size, SocketFlags. None);

??????????????????????????? Size = fs. Read (buff, 0, 1024);

??????????????????????? }

??????????????????????? Fs. Close ();

??????????????????? }

??????????????? }

??????????????? Soc. Send (boundary, boundary. Length, SocketFlags. None);

??????????????? return 1;

??????????? }

??????????? Catch (Exception exc)

??????????? {

??????????????? ErrMsg = exc. Message.tostring ();

??????????????? return 0;

??????????? }

??????? }

?

Hybrid form upload using the socket to simulate HTTP (submit a form in one request and upload multiple files)