[asp.net] 利用WebClient上传图片到远程服务

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;
].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 + "\"}";
}