. NET direct output remote file to browser and download file saved to native

Using XMLHTTP, the implementation of the code is simple and concrete implementation is as follows:

First the bin file is introduced, Com->microsoft XML v3.0

The specific code is as follows:

protected voidButton1_Click (Objectsender, EventArgs e) {        stringFileNames ="201406251824392435.pdf", ContentType =""; stringHouzhui = filenames.substring (Filenames.lastindexof (".")); ContentType=Checktype (FileNames); stringURL ="http://xxx.xxx.xxx.xxx:8089/upfile/wenku/"+filenames;//domain name or IP addressstringStringfilename = url.substring (Url.lastindexof ("/") +1); stringStringfilepath =Request.physicalapplicationpath; if(! Stringfilepath.endswith ("/")) Stringfilepath + ="/"; Try{MSXML2. XMLHTTP _xmlhttp=NewMSXML2.            Xmlhttpclass (); _xmlhttp.open ("GET"Urlfalse,NULL,NULL); _xmlhttp.send (""); if(_xmlhttp.readystate = =4)//Data Reception Complete            {                if(_xmlhttp.status = = $)//whether to return the correct data{HttpContext.Current.Response.AddHeader ("content-disposition","attachment; Filename="+ Httputility.urlencode ("Test"+Houzhui, System.Text.Encoding.UTF8)); HttpContext.Current.Response.ContentType=ContentType; HttpContext.Current.Response.BinaryWrite ((byte[]) _xmlhttp.responsebody);//output binary to browserHttpContext.Current.Response.Flush ();                HttpContext.Current.Response.End (); }                Else{Response.Write ("Error:"+ _xmlhttp.statustext +"the file you want to download is not found!"); }            }            Else{Response.Write ("Error:"+ _xmlhttp.statustext +"the HTTP address of the request is not correct! ");            Response.End (); }        }        Catch(Exception ex) {Response.Write ("Error: Unable to find the requested resource! ");        Response.End (); }    }

Returns the MIME type:

Private Static stringChecktype (stringfilename) {        stringContentType; stringHouzhui = filename. Substring (filename. LastIndexOf (".") +1). Trim ().        ToLower (); Switch(Houzhui) { Case ". asf": ContentType="video/x-ms-asf";  Break;  Case ". avi": ContentType="Video/avi";  Break;  Case ". doc": ContentType="Application/msword";  Break;  Case ". zip": ContentType="Application/zip";  Break;  Case ". xls": ContentType="Application/vnd.ms-excel";  Break;  Case ". gif": ContentType="Image/gif";  Break;  Case ". jpg": ContentType="Image/jpeg";  Break;  Case "JPEG": ContentType="Image/jpeg";  Break;  Case ". wav": ContentType="Audio/wav";  Break;  Case ". mp3": ContentType="audio/mpeg3";  Break;  Case ". mpg": ContentType="Video/mpeg";  Break;  Case ". MEPG": ContentType="Video/mpeg";  Break;  Case ". rtf": ContentType="application/rtf";  Break;  Case ". html": ContentType="text/html";  Break;  Case ". htm": ContentType="text/html";  Break;  Case ". txt": ContentType="Text/plain";  Break;  Case ". pdf": ContentType="application/pdf";  Break; default: ContentType="Application/octet-stream";  Break; }        returnContentType; }

Download the file and save it to this machine:

 <summary>////Get remote file to local///</summary>//<param name= "url" > Remote file Address </param>/// Lt;param name= "path" > Local path </param> private static void Downurltofile (string url, string path) {Strin        G Cookie = String.Empty; String refer = URL. Substring (0, URL.        LastIndexOf ("/") + 1);        System.Net.HttpWebRequest req = System.Net.HttpWebRequest.Create (URL) as System.Net.HttpWebRequest; Req.        AllowAutoRedirect = false; Req.        Referer = refer; Req. useragent = "mozilla/5.0 (Windows; U Windows NT 6.1; ZH-CN;        rv:1.9.2.13) gecko/20101203 firefox/3.6.13 "; System.Net.HttpWebResponse res = req.        GetResponse () as System.Net.HttpWebResponse; System.Net.WebHeaderCollection headers = Res.        Headers;        String Newurl = ""; if (res.          StatusCode = = System.Net.HttpStatusCode.Found) | | (Res.          StatusCode = = System.Net.HttpStatusCode.Redirect) | | (Res.  StatusCode = = System.Net.HttpStatusCode.Moved) | |        (Res.            StatusCode = = System.Net.HttpStatusCode.MovedPermanently)) {Newurl = headers["Location"];        Newurl = Newurl.trim ();        } if (headers["Set-cookie"]! = null) {Cookie = headers["Set-cookie"]; } res.        Close ();        req = null;        String fileName = newurl.substring (Newurl.lastindexof ("/") + 1);        req = System.Net.HttpWebRequest.Create (URL) as System.Net.HttpWebRequest; Req.        AllowAutoRedirect = true; Req.        Referer = URL; Req. useragent = "mozilla/5.0 (Windows; U Windows NT 6.1; ZH-CN;        rv:1.9.2.13) gecko/20101203 firefox/3.6.13 "; res = req.        GetResponse () as System.Net.HttpWebResponse; System.IO.Stream Stream = Res.        GetResponseStream ();        byte[] buffer = new BYTE[32 * 1024];        int bytesprocessed = 0;        System.IO.FileStream fs = System.IO.File.Create (HttpContext.Current.Server.MapPath (path));        int bytesread; do {bytesread = StReam. Read (buffer, 0, buffer.            Length); Fs.            Write (buffer, 0, bytesread);        bytesprocessed + = Bytesread;        } while (Bytesread > 0); Fs.        Flush (); Fs.        Close (); Res.    Close (); }