ASP.NET中利用WebClient上传图片到远程服务的方法


            一、客户端

1.页面





<form id="Form1" method="post" runat="server" enctype="multipart/form-data">

　　　　<input id="MyFile" type="file" runat="server" />

　　　　<br />

　　　　<br />

　　　　<asp:Button ID="Button1" runat="server" Text="上载文件" OnClick="Button1_Click"></asp:Button>

　　</form>



2.后台





System.Web.HttpFileCollection oFiles = System.Web.HttpContext.Current.Request.Files;

   string FilePath = oFiles[0].FileName;

   string FileName = FilePath.Substring(FilePath.LastIndexOf("\\") + 1);

   byte[] b = new byte[oFiles[0].ContentLength];

   System.IO.Stream fs = (System.IO.Stream)oFiles[0].InputStream;

   fs.Read(b, 0, oFiles[0].ContentLength);

   string postData = "data=" + HttpUtility.UrlEncode(Convert.ToBase64String(b));

   var webclient = new WebClient();

   webclient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");

   byte[] byteArray = Encoding.UTF8.GetBytes(postData);

   //byte[] buffer = webclient.UploadData("http://localhost/datapush/DataPush.ashx", "POST", byteArray);//ashx

   byte[] buffer = webclient.UploadData("http://localhost/datapush/WebServiceDataPush.asmx/DataPush", "POST", byteArray);//asmx

   var msg = Encoding.UTF8.GetString(buffer);

   Response.Write(msg);



二、服务端





string msg = "";

   byte[] filedata = Convert.FromBase64String(context.Request["data"]);

   if (filedata.Length == 0)

   {

    msg= "{\"code\":\"上传的是空文件\"}";

   }

   if (filedata.Length > 1048576)

   {

    msg = "{\"code\":\"图片大小不能超过1M\"}";

   }

   string fileextension = filedata[0].ToString() + filedata[1].ToString();

   if (fileextension == "7173")

   {

    fileextension = "gif";

   }

   else if (fileextension == "255216")

   {

    fileextension = "jpg";

   }

   else if (fileextension == "13780")

   {

    fileextension = "png";

   }

   else if (fileextension == "6677")

   {

    fileextension = "bmp";

   }

   else if (fileextension == "7373")

   {

    fileextension = "tif";

   }

   else

   {

    msg = "{\"code\":\"上传的文件不是图片\"}";

   }

   try

   {

    //保存图片

    string filename = Guid.NewGuid().ToString("D") + "." + fileextension;

    System.IO.MemoryStream ms = new System.IO.MemoryStream(filedata);

    System.IO.FileStream fs = new System.IO.FileStream(context.Server.MapPath("~/") + "/采集图片/" + filename, System.IO.FileMode.Create);

    ms.WriteTo(fs);

    ms.Close();

    fs.Close();

    fs = null;

    ms = null;

    msg = "{\"code\":\"上传图片成功\"}";

   }

   catch (Exception exe)

   {

    msg = "{\"code\":\"" + exe.Message + "\"}";

   }



以上所述是小编给大家介绍的ASP.NET中利用WebClient上传图片到远程服务的方法，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对中文源码网网站的支持！