using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Net;
using System.Text;
using System.IO;

/// <summary>
///HttpUploadDemo 的摘要说明
/// </summary>
public class HttpUploadDemo
{
    public HttpUploadDemo()
    {
    
    }

    /// <summary>
    /// Http上传文件
    /// </summary>
    public static string HttpUploadFile(string url, string path)
    {
        // 设置参数
        HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
        CookieContainer cookieContainer = new CookieContainer();
        request.CookieContainer = cookieContainer;
        request.AllowAutoRedirect = true;
        request.Method = "POST";
        //时间戳
        string boundary = DateTime.Now.Ticks.ToString("X"); // 随机分隔线
        request.ContentType = "multipart/form-data;charset=utf-8;boundary=" + boundary;
        byte[] itemBoundaryBytes = Encoding.UTF8.GetBytes("\r\n--" + boundary + "\r\n");
        byte[] endBoundaryBytes = Encoding.UTF8.GetBytes("\r\n--" + boundary + "--\r\n");

        int pos = path.LastIndexOf("\\");
        
        string fileName = path.Substring(pos + 1);

        string headContent = string.Format("Content-Disposition:form-data;name=\"file\";filename=\"{0}\"\r\nContent-Type:application/octet-stream\r\n\r\n", fileName);

        //请求头部信息
        StringBuilder sbHeader = new StringBuilder(headContent);

        byte[] postHeaderBytes = Encoding.UTF8.GetBytes(sbHeader.ToString());

        FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);
        byte[] bArr = new byte[fs.Length];
        fs.Read(bArr, 0, bArr.Length);
        fs.Close();

        //将上传文件流数据添加到请求流中。。。
        Stream postStream = request.GetRequestStream();
        //"\r\n--" + boundary + "\r\n" 这个byte数据
        postStream.Write(itemBoundaryBytes, 0, itemBoundaryBytes.Length);
        //信息头byte 数据 "Content-Disposition:form-data;name=\"file\";filename=\"{0}\"\r\nContent-Type:application/octet-stream\r\n\r\n
        postStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);
        //需要上传文件byte数据
        postStream.Write(bArr, 0, bArr.Length);
        //添加尾部的时间戳  
        //\r\n--" + boundary + "--\r\n 这个byte数据
        postStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length);
        postStream.Close();

        //发送请求并获取相应回应数据
        HttpWebResponse response = request.GetResponse() as HttpWebResponse;
        //直到request.GetResponse()程序才开始向目标网页发送Post请求
        Stream instream = response.GetResponseStream();
        StreamReader sr = new StreamReader(instream, Encoding.UTF8);
        //返回结果网页（html）代码
        string content = sr.ReadToEnd();
        return content;
    }

 
}

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class httpUpload_Index : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            string url = "http://172.16.1.110:8888/httpUpload/Index.aspx";
            string filepath = @"C:\Users\Administrator\Desktop\images\QQ截图20140620081425.png";
            string result = HttpUploadDemo.HttpUploadFile3(url, filepath);
            Response.Write(result);
        }
    }
}

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.IO;

namespace WebThreadTest.httpUpload
{
    public partial class Index : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            string password = this.Request["password"];

            string loginName = this.Request["loginName"];

            HttpPostedFile file = Request.Files[0];

            if (file.ContentLength <= 0)
            {
                return;
            }

            string filename = file.FileName;

            string extension = Path.GetExtension(filename);

            string uploadFilename = DateTime.Now.ToFileTime() + extension;

            string uploadDic = Server.MapPath(@"~/resource/httpUpload/");



            if (!Directory.Exists(uploadDic))
            {
                Directory.CreateDirectory(uploadDic);
            }

            file.SaveAs(uploadDic + uploadFilename);

            Response.Write("Success\r\n");

        }
    }
}