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The first type: uploading Files via FTP
First, set up the FTP service on another server and create a user and password that allow uploading, and then upload the file directly to the FTP server in ASP. The code is as follows:
<%@ page language= "C #" enableviewstate= "false"%>The second type: uploading Files via WebClient
For example: Now the virtual directory of the Web application being developed is Webaa, and the virtual directory of the other application is WEBBB, now to save the picture from Webaa to a uploadfiles folder under WEBBB
1. Add a uploadhandler.ashx file under the WEBBB project with the following code:
public class Uploadhandler:ihttphandler2. In the WEBAA project, request the URL by WebClient or WebRequest, as shown in the WebClient example below. Create a new test.aspx page in Webaa with the FileUpload control FileUpload1 and the button control Button1, with the following event code:
Using system.io;using system.net; memorystream ms;protected void wc_openwritecompleted (object sender, OpenWriteCompletedEventArgs e) { int bufSize = 10; int byteget = 0; byte[] buf = new byte[bufsize]; while (Byteget = Ms. Read (buf, 0, bufSize)) > 0)//loop read, upload { e.result.write (buf, 0, byteget);//Note here &N Bsp } e.result.close ();//close Ms. Close (); ms}protected void Button1_Click (object sender, EventArgs e) { FileUpload fi = fileupload1; & nbsp byte[] bt = fi. filebytes;//Get file byte[] ms = new MemoryStream (BT);//byte[], instantiate ms uribuilder url = new Ur Ibuilder ("Http://xxxxxxxx/WebBB/UploadHandler.ashx");//upload path URL. Query = string. Format ("filename={0}", Path.getfilename (FI. FileName);//upload URL parameter WebClient WC = new WebClient (); WC. openwritecompleted + = new OpenwritecompletedeventHandler (wc_openwritecompleted);//delegate asynchronous upload event WC. OpenWriteAsync (URL. URI);//start Asynchronous upload}The third type: uploading Files via Web service (in the same way as the second principle)
1. First define the Web service class with the following code:
Using system;using system.data;using system.web;using system.collections;using system.web.services;using System.web.services.protocols;using system.componentmodel;using system.io; namespace UpDownFile{ /**/ ///<summary> //Updownfile Summary description //</summary> [We bservice (Namespace = "http://tempuri.org/")] [webservicebinding (ConformsTo = wsiprofiles.basicprofile1_ 1)] [ToolboxItem (false)] public class updownfile:system.web.services.webservice { //upload files to WebService server, here in order to manipulate the method, the files are saved in the file directory under the Updownfile Service folder [webmethod] public bool Up (byte[] data, string filename) &NBS P { try { &NBSP ; FileStream fs = File.create (Server.mappatH ("file/") + filename); FS. Write (data, 0, data. Length); FS. Close (); return true; }&NB Sp catch { &NBS P return false; } } &NB Sp //Download the WebService file on the server [webmethod] public byte[] down (ST Ring filename) { String filepath = Server.MapPath ("Fil e/") + filename; if (file.exists (filepath)) &NB Sp { try &NBSP { FileStream s = file.ope Nread (filepath); return Convertstreamtobytebuffer (s) ; } CATCH&NB Sp { RE Turn new byte[0]; } }&NBSP ; else { &NBSP ; return new byte[0]; } } }}2. Refer to the Web service created above in the website, named (Updownfile, you can define it yourself), then implement the file upload and download separately in page downfile.aspx:
Upload:FileUpload1 is an fileupload control for an ASPX page
Updownfile.updownfile up = new Updownfile.updownfile ();
Up. Up (Convertstreamtobytebuffer (FileUpload1.PostedFile.InputStream),
FileUpload1.PostedFile.FileName.Substring (FileUpload1.PostedFile.FileName.LastIndexOf ("\ \") + 1));
Download:
Updownfile.updownfile down = new Updownfile.updownfile ();
byte[] File = down. Down (request.querystring["filename"]. ToString ()); FileName is the path to the file you want to download, and you can get the file path yourself in other ways
Response.BinaryWrite (file);
The following is a function that converts a file to a file byte (because the stream type is not transmitted directly through WebService):
Protected byte[] Convertstreamtobytebuffer (stream s) {BinaryReader br = new BinaryReader (stream); byte[] Filebytes = br. Readbytes ((int) stream. Length); return filebytes;}Fourth: How to jump through pages or nested pages (this method is very simple, strictly not cross-server, and has certain limitations)
Implementation method:
1. On the page that needs to upload the file, add Iframe,iframe address to another server upload page, and the page must include the upload button;
2. Need to upload the use of JS location.href or server Response.Redirect to jump to another page upload;
Methods in fact, there are not one by one cases, of course, the above method is only to implement upload and download functions, and sometimes may also need to consider cross-server delete files, this may need to consider security and other aspects of the problem.
Sync posted on my personal site: http://www.zuowenjun.cn/post/2014/09/29/44.html
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