C#使用HttpWebRequest和HttpWebResponse上传文件示例

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C#使用HttpWebRequest和HttpWebResponse上传文件示例

1.HttpHelper类：

复制内容到剪贴板程序代码 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：

复制内容到剪贴板程序代码 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();
????????}
????}
}
参考资料

[1].ASP无组件上传原理：http://www.jjshang.com/jjshangnew/book/asp/mustfiles/jjupload.pdf
[2].Upload files with HTTPWebrequest (multipart/form-data)：http://stackoverflow.com/questions/566462/upload-files-with-httpwebrequest-multipart-form-data?

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