asp.net上传文件后台通过二进制流发送到其他Url保存

实际情况一般有单独的站点存放静态文件，比如图片、office文档等。A站点的操作需要上传文件到B站点，

下面介绍一种方法通过System.Net.WebClient类的UploadData方法 。

uploadFile.aspx html：

<form id="form1" runat="server">    <div>        <asp:FileUpload runat="server" ID="fileUp" AllowMultiple="true" />         <asp:Button runat="server" ID="btnLoad" Text="Upload" OnClick="btnLoad_Click" />    </div>    </form>

uploadFile.cs 后台代码

 PRotected void btnLoad_Click(object sender, EventArgs e)        {            if (fileUp.HasFile)            {                var list = fileUp.PostedFiles;                foreach (var item in list)                {                    string fileDoc = System.IO.Path.GetExtension(item.FileName).ToLower(); //后缀名                    int fileLength = (int)item.InputStream.Length;//InputStream.Length;                    byte[] byteFile = new byte[fileLength];                    item.InputStream.Read(byteFile, 0, fileLength);                    item.InputStream.Seek(0, System.IO.SeekOrigin.Begin); //读取流之后设置设置当前流的位置，因为md5加密也需要用到该流                    string md5Value =  Com.MD5.MyMD5.getMd5Hash(item.InputStream); //得到上传文件流的MD5string url = string.Format("http://localhost:4884/SaveFile.ashx?name=" + md5Value + "&ext=" + fileDoc);  //保存流的处理文件路径                    System.Net.WebClient wc = new System.Net.WebClient();                    byte[] bts = wc.UploadData(url, "POST", byteFile);                    wc.Dispose();                    string filePath = System.Text.Encoding.UTF8.GetString(bts); //获取SaveFile.ashx返回                }            }        }

Com.MD5.MyMD5.getMd5Hash方法请看：我的C# MD5摘要算法、哈希算法SaveFile.ashx 处理程序

 /// <summary>    /// SaveFile 的摘要说明    /// </summary>    public class SaveFile : IHttpHandler    {        public void ProcessRequest(HttpContext context)        {            lock (context.Request.InputStream)            {                HttpRequest Request = context.Request;                string path = ""; string filenName = "";                string re = "";                if (Request.HttpMethod.ToLower() == "post")                {                    try                    {                        using (Request.InputStream)                        {                            string name = Request["name"];                            string s = Request["ext"];                            byte[] bytes = new byte[Request.InputStream.Length];                            Request.InputStream.Read(bytes, 0, bytes.Length);                             Request.InputStream.Seek(0, SeekOrigin.Begin);//设置当前流的位置                            //Request.InputStream.Position = 0;                            Request.InputStream.Flush();                            Request.InputStream.Close();                            Request.InputStream.Dispose();                            Random rnd = new Random();                            int n = rnd.Next(1000, 9999);                            //filenName = "/file/" + n.ToString() + "-" + DateTime.Now.ToString("yyyyMMddHHmmssss") + s;                            filenName = "/file/"+name + s;                            path = context.Server.MapPath(filenName);                            FileStream fs = new FileStream(path, FileMode.Create);                            BinaryWriter bw = new BinaryWriter(fs);                            bw.Write(bytes);                            bw.Close();                            fs.Close();                            re = filenName;                           //System.Threading.Thread.Sleep(500);                        }                    }                    catch (Exception ex)                    {                                            }                }                context.Response.ContentType = "text/plain";                context.Response.Write(re);                context.Response.End();            }        }        public bool IsReusable        {            get            {                return false;            }        }    }