프로그램적으로 파일업로드

파일업로드를 하려면 와 같이 테그를 이용하여 업로드 할 수 있는데, 파일명이 주기적으로 바뀌고 매일 업로드를 해야한다면 페이지를 이용하여 작업하기란 너무 번거로운 일이다. 그래서 이 업로드 작업을 프로그램으로 자동적으로 하는 것이 필요하다.

protected static void FileUpload()

{

string strURL = "http://www.remoteserver.com/upload.aspx";

string strParam = "param1=p1&m2=p2";

string strFilePath = "c:\\test.txt";

string strResult = HttpFileUpload(strURL, strParam, strFilePath);

}

static string HttpFileUpload(string strURL, string strParam, string strFilePath)

{

string strBoundary = "-----------------------------7dc298630874"; // 구분자

Dictionary dicParams = new Dictionary();

HttpWebRequest req = (HttpWebRequest)WebRequest.Create(strURL);

req.AllowAutoRedirect = true;

req.AllowWriteStreamBuffering = true;

req.Method = "POST";

req.ContentType = "multipart/form-data; boundary=" + strBoundary;

if(!string.IsNullOrEmpty(strParam))

{

foreach (string param in strParam.Split('&'))

{

string strName = param.Split('=')[0];

string strValue = param.Split('=')[1];

dicParams.Add(strName, strValue);

}

}

FileStream fs = new FileStream(strFilePath, FileMode.Open, FileAccess.Read);

byte[] bytes = new byte[1024]; 

int nRead = fs.Read(bytes, 0, bytes.Length);

fs.Close();

dicParams.Add("filename", new FileParamFormat(bytes, strFilePath, "text/plain"));

byte[] buffer = GetMultipartFormData(Encoding.GetEncoding("gb2312"), dicParams, strBoundary);

int bufferLength = buffer.Length;

req.ContentLength = bufferLength;

// Request

Stream reqStream = req.GetRequestStream();

reqStream.Write(buffer, 0, buffer.Length);

reqStream.Close();

HttpWebResponse res = (HttpWebResponse)req.GetResponse();

// Response

Stream resStream = res.GetResponseStream();

StreamReader resReader = new StreamReader(resStream, Encoding.GetEncoding("gb2312"));

string strResult = resReader.ReadToEnd();

resStream.Close();

res.Close();

return strResult;

}

public class FileParamFormat 

{

public byte[] File { get; set; }

public string FileName { get; set; }

public string ContentType { get; set; }

public FileParamFormat (byte[] file) : this(file, null) { }

public FileParamFormat (byte[] file, string filename) : this(file, filename, null) { }

public FileParamFormat (byte[] file, string filename, string contenttype)

{

File = file;

FileName = filename;

ContentType = contenttype;

}

}

static byte[] GetMultipartFormData(Encoding encoding, Dictionary dicParams, string strBoundary)

{

Stream stream = new System.IO.MemoryStream();

foreach (var param in dicParams)

{

if (param.Value is FileParamFormat)

{

// file parameter

FileParamFormat fileParam = (FileParamFormat)param.Value;

string strHeader = string.Format("--{0}\r\nContent-Disposition: form-data; name=\"{1}\"; filename=\"{2}\";\r\nContent-Type: {3}\r\n\r\n",

strBoundary,

param.Key,

fileParam.FileName ?? param.Key,

fileParam.ContentType ?? "application/octet-stream");

stream.Write(encoding.GetBytes(strHeader), 0, strHeader.Length);

stream.Write(fileParam.File, 0, fileParam.File.Length);

}

else

{

// text parameter

string strParam = string.Format("--{0}\r\nContent-Disposition: form-data; name=\"{1}\"\r\n\r\n{2}\r\n",

strBoundary,

param.Key,

param.Value);

stream.Write(encoding.GetBytes(strParam), 0, strParam.Length);

}

}

string strFooter = "--" + strBoundary + "--\r\n";

stream.Write(encoding.GetBytes(strFooter), 0, strFooter.Length);

stream.Position = 0;

byte[] formData = new byte[stream.Length];

stream.Read(formData, 0, formData.Length);

stream.Close();

return formData;

}