如何在ASP.NET中利用WebClient上傳圖片到遠程服務?

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如何在ASP.NET中利用WebClient上傳圖片到遠程服務?

一、客戶端

1.頁面

<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="上載文件" OnClick="Button1_Click"></asp:Button>

</form>

2.後台

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();

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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、服務端

string msg = "";

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

if (filedata.Length == 0)

{

msg= "

if (filedata.Length > 1048576)

{

msg = "

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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";

}

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else if (fileextension == "7373")

{

fileextension = "tif";

}

else

{

msg = "

try

{

//保存圖片

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("~/") + "/采集圖片/" + filename, System.IO.FileMode.Create);

ms.WriteTo(fs);

ms.Close();

fs.Close();

fs = null;

ms = null;

msg = "

catch (Exception exe)

{

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

}

以上所述是小編給大家介紹的ASP.NET中利用WebClient上傳圖片到遠程服務的方法,希望對大家有所幫助,如果大家有任何疑問請給我留言,小編會及時回複大家的。在此也非常感謝大家對路飯網站的支持!

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