C#使用HttpWebRequest和HttpWebResponse上传文件示例

来源：http://www.mzwu.com/article.asp?id=3475

1.HttpHelper类：

using System;

using System.Collections.Specialized;

using System.IO;

using System.Net;

using System.Text;

namespace ConsoleApplication1

{

    public static class HttpHelper

    {

        private static readonly Encoding DEFAULTENCODE = Encoding.UTF8;

        /// <summary>

        /// HttpUploadFile

        /// </summary>

        /// <param name="url"></param>

        /// <param name="file"></param>

        /// <param name="data"></param>

        /// <returns></returns>

        public static string HttpUploadFile(string url, string file, NameValueCollection data)

        {

            return HttpUploadFile(url, file, data, DEFAULTENCODE);

        }

        /// <summary>

        /// HttpUploadFile

        /// </summary>

        /// <param name="url"></param>

        /// <param name="file"></param>

        /// <param name="data"></param>

        /// <param name="encoding"></param>

        /// <returns></returns>

        public static string HttpUploadFile(string url, string file, NameValueCollection data, Encoding encoding)

        {

            return HttpUploadFile(url, new string[] { file }, data, encoding);

        }

        /// <summary>

        /// HttpUploadFile

        /// </summary>

        /// <param name="url"></param>

        /// <param name="files"></param>

        /// <param name="data"></param>

        /// <returns></returns>

        public static string HttpUploadFile(string url, string[] files, NameValueCollection data)

        {

            return HttpUploadFile(url, files, data, DEFAULTENCODE);

        }

        /// <summary>

        /// HttpUploadFile

        /// </summary>

        /// <param name="url"></param>

        /// <param name="files"></param>

        /// <param name="data"></param>

        /// <param name="encoding"></param>

        /// <returns></returns>

        public static string HttpUploadFile(string url, string[] files, NameValueCollection data, Encoding encoding)

        {

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

            byte[] boundarybytes = Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");

            byte[] endbytes = Encoding.ASCII.GetBytes("\r\n--" + boundary + "--\r\n");

            //1.HttpWebRequest

            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);

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

            request.Method = "POST";

            request.KeepAlive = true;

            request.Credentials = CredentialCache.DefaultCredentials;

            using (Stream stream = request.GetRequestStream())

            {

                //1.1 key/value

                string formdataTemplate = "Content-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}";

                if (data != null)

                {

                    foreach (string key in data.Keys)

                    {

                        stream.Write(boundarybytes, 0, boundarybytes.Length);

                        string formitem = string.Format(formdataTemplate, key, data[key]);

                        byte[] formitembytes = encoding.GetBytes(formitem);

                        stream.Write(formitembytes, 0, formitembytes.Length);

                    }

                }

                //1.2 file

                string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: application/octet-stream\r\n\r\n";

                byte[] buffer = new byte[4096];

                int bytesRead = 0;

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

                {

                    stream.Write(boundarybytes, 0, boundarybytes.Length);

                    string header = string.Format(headerTemplate, "file" + i, Path.GetFileName(files[i]));

                    byte[] headerbytes = encoding.GetBytes(header);                    

                    stream.Write(headerbytes, 0, headerbytes.Length);

                    using (FileStream fileStream = new FileStream(files[i], FileMode.Open, FileAccess.Read))

                    {                        

                        while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)

                        {

                            stream.Write(buffer, 0, bytesRead);

                        }

                    }

                }

                //1.3 form end

                stream.Write(endbytes, 0, endbytes.Length);

            }

            //2.WebResponse

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();

            using (StreamReader stream = new StreamReader(response.GetResponseStream()))

            {

                return stream.ReadToEnd();

            }

        }

    }

}

2.调用示例：

using System;

using System.Collections.Specialized;

namespace ConsoleApplication1

{

    class Program

    {

        static void Main(string[] args)

        {

            NameValueCollection data = new NameValueCollection();

            data.Add("name", "木子屋");

            data.Add("url", "http://www.mzwu.com/");

            Console.WriteLine(HttpHelper.HttpUploadFile("http://localhost/Test", new string[] { @"E:\Index.htm", @"E:\test.rar" }, data));

            Console.ReadKey();

        }

    }

}