[asp.net] 利用WebClient上傳圖片到遠程服務，

[asp.net] 利用WebClient上傳圖片到遠程服務，

一、客戶端

1.頁面

1　　 <form id="Form1" method="post" runat="server" enctype="multipart/form-data">
2 　　　　<input id="MyFile" type="file" runat="server" />
3 　　　　<br />
4 　　　　<br />
5 　　　　<asp:Button ID="Button1" runat="server" Text="上載文件" OnClick="Button1_Click"></asp:Button>
6 　　</form>

2.後台

 1             System.Web.HttpFileCollection oFiles = System.Web.HttpContext.Current.Request.Files;
 2             string FilePath = oFiles[0].FileName;
 3             string FileName = FilePath.Substring(FilePath.LastIndexOf("\\") + 1);
 4             byte[] b = new byte[oFiles[0].ContentLength];
 5             System.IO.Stream fs = (System.IO.Stream)oFiles[0].InputStream;
 6             fs.Read(b, 0, oFiles[0].ContentLength);
 7             string postData = "data=" + HttpUtility.UrlEncode(Convert.ToBase64String(b));
 8             var webclient = new WebClient();
 9             webclient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
10             byte[] byteArray = Encoding.UTF8.GetBytes(postData);
11             //byte[] buffer = webclient.UploadData("http://localhost/datapush/DataPush.ashx", "POST", byteArray);//ashx
12             byte[] buffer = webclient.UploadData("http://localhost/datapush/WebServiceDataPush.asmx/DataPush", "POST", byteArray);//asmx
13             var msg = Encoding.UTF8.GetString(buffer);
14             Response.Write(msg);

二、服務端

 1             string msg = "";
 2             byte[] filedata = Convert.FromBase64String(context.Request["data"]);
 3             if (filedata.Length == 0)
 4             {
 5                 msg= "{\"code\":\"上傳的是空文件\"}";
 6             }
 7             if (filedata.Length > 1048576)
 8             {
 9                 msg = "{\"code\":\"圖片大小不能超過1M\"}";
10             }
11             string fileextension = filedata[0].ToString() + filedata[1].ToString();
12             if (fileextension == "7173")
13             {
14                 fileextension = "gif";
15             }
16             else if (fileextension == "255216")
17             {
18                 fileextension = "jpg";
19             }
20             else if (fileextension == "13780")
21             {
22                 fileextension = "png";
23             }
24             else if (fileextension == "6677")
25             {
26                 fileextension = "bmp";
27             }
28             else if (fileextension == "7373")
29             {
30                 fileextension = "tif";
31             }
32             else
33             {
34                 msg = "{\"code\":\"上傳的文件不是圖片\"}";
35             }
36 
37             try
38             {
39                 //保存圖片
40                 string filename = Guid.NewGuid().ToString("D") + "." + fileextension;
41                 System.IO.MemoryStream ms = new System.IO.MemoryStream(filedata);
42                 System.IO.FileStream fs = new System.IO.FileStream(context.Server.MapPath("~/") + "/采集圖片/" + filename, System.IO.FileMode.Create);
43                 ms.WriteTo(fs);
44                 ms.Close();
45                 fs.Close();
46                 fs = null;
47                 ms = null;
48                 msg = "{\"code\":\"上傳圖片成功\"}";
49             }
50             catch (Exception exe)
51             {
52                 msg = "{\"code\":\"" + exe.Message + "\"}";
53             }
54