[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">
2. 　　　　<input id="MyFile" type="file" runat="server" />
3. 　　　　<br />
4. 　　　　<br />
5. 　　　　<asp:Button ID="Button1" runat="server" Text="上载文件" OnClick="Button1_Click"></asp:Button>
6. 　　</form>

2.后台

1. System.Web.HttpFileCollection oFiles = System.Web.HttpContext.Current.Request.Files;
2. ].FileName;
3. );
4. ].ContentLength];
5. System.IO.Stream fs = (System.IO.Stream)oFiles[].InputStream;
6. fs.Read(b, , oFiles[].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、服务端

1. string msg = "";
2. byte[] filedata = Convert.FromBase64String(context.Request["data"]);
3. )
4. {
5. msg= "{\"code\":\"上传的是空文件\"}";
6. }
7. )
8. {
9. msg = "{\"code\":\"图片大小不能超过1M\"}";
10. }
11. ].ToString() + filedata[].ToString();
12. ")
13. {
14. fileextension = "gif";
15. }
16. ")
17. {
18. fileextension = "jpg";
19. }
20. ")
21. {
22. fileextension = "png";
23. }
24. ")
25. {
26. fileextension = "bmp";
27. }
28. ")
29. {
30. fileextension = "tif";
31. }
32. else
33. {
34. msg = "{\"code\":\"上传的文件不是图片\"}";
35. }
36.  
37. try
38. {
39. //保存图片
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("~/") + "/采集图片/" + filename, System.IO.FileMode.Create);
43. ms.WriteTo(fs);
44. ms.Close();
45. fs.Close();
46. fs = null;
47. ms = null;
48. msg = "{\"code\":\"上传图片成功\"}";
49. }
50. catch (Exception exe)
51. {
52. msg = "{\"code\":\"" + exe.Message + "\"}";
53. }