using System;
using System.Collections;
using System.Configuration;
using System.Data;
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.IO;
using System.Drawing;
using System.Text;
using System.Net;
using System.Xml;

  /// <summary>
    /// 测试 发送数据
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void Button2_Click(object sender, EventArgs e)
    {
        string url = "http://www.ktonsoft.com/GetPosStr.aspx";//发送到的页面的地址
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);

        //读取一个文件
        FileStream fs = new FileStream(Server.MapPath("aa.zip"), System.IO.FileMode.Open, System.IO.FileAccess.Read);
        byte[] filecontent = new byte[fs.Length];
        fs.Read(filecontent, 0, filecontent.Length);
        fs.Close();
        fs.Dispose();

        //将图片转换成base64编码的流
        string a = Convert.ToBase64String(filecontent);

        //读取base64编码流，发送
        byte[] requestBytes = System.Text.Encoding.Default.GetBytes(a);

        req.Method = "POST";
        req.ContentType = "application/x-www-form-urlencoded";
        req.ContentLength = requestBytes.Length;
        Stream requestStream = req.GetRequestStream();
        requestStream.Write(requestBytes, 0, requestBytes.Length);
        requestStream.Close();

        //接收返回参数，到string backstr
        HttpWebResponse res = (HttpWebResponse)req.GetResponse();
        StreamReader sr = new StreamReader(res.GetResponseStream(), System.Text.Encoding.Default);
        string backstr = sr.ReadToEnd();
        sr.Close();
        res.Close();
        //输出参数
        Response.Write(backstr);
    }

using System;
using System.Collections;
using System.Configuration;
using System.Data;
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.IO;
using System.Drawing;
using System.Text;
using System.Net;
using System.Xml;

public partial class GetPosStr : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        //接收到的参数
        //string bb = Request.QueryString["aa"];
        Encoding myEncoding = Encoding.GetEncoding("utf-8");

        //接收传递过来的数据流
        Stream resStream = Request.InputStream;

        byte[] filecontent = new byte[resStream.Length];
        //将数据流读入byte数组
        resStream.Read(filecontent, 0, filecontent.Length);
        //数组转换为string以便转换base64使用
        string a = myEncoding.GetString(filecontent);
        //将string读取base64解密到byte数组
        byte[] filecontent2 = Convert.FromBase64String(a);
        //写入目录
        File.WriteAllBytes(Server.MapPath("zvzv.zip"), filecontent2);
        //返回值
        Response.Write("ok");
        Response.End();
    }
}