[asp.net] 利用WebClient上传图片到远程服务

一、客户端

1.页面

1　　 <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;
             ].FileName;
             );
             ].ContentLength];
             System.IO.Stream fs = (System.IO.Stream)oFiles[].InputStream;
             fs.Read(b, , oFiles[].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"]);
             )
             {
                 msg= "{\"code\":\"上传的是空文件\"}";
             }
             )
             {
                 msg = "{\"code\":\"图片大小不能超过1M\"}";
             }
             ].ToString() + filedata[].ToString();
             ")
             {
                 fileextension = "gif";
             }
             ")
             {
                 fileextension = "jpg";
             }
             ")
             {
                 fileextension = "png";
             }
             ")
             {
                 fileextension = "bmp";
             }
             ")
             {
                 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 + "\"}";
             }