Golang+android (using httpurlconnection) for file uploads

This is a creation in Article, where the information may have evolved or changed.

This article is to demonstrate the use of the Android program as a client (using HttpURLConnection to access the network), the Golang program as a server side, to implement file upload.

Client code:

public static string UploadFile (String uploadurl, String filePath) {log.v (TAG, "url:" + uploadurl);        LOG.V (TAG, "FilePath:" + FilePath);        String nextline = "\ r \ n";        String Dividerstart = "--";        String boundary = "******";            try {URL url = new URL (uploadurl);            HttpURLConnection connection = (httpurlconnection) url.openconnection ();            Connection.setchunkedstreamingmode (1024 * 256);            Connection.setdoinput (TRUE);            Connection.setdooutput (TRUE);            Connection.setusecaches (FALSE);            Connection.setrequestmethod ("POST");            Set HTTP request Header Connection.setrequestproperty ("Connection", "keep-alive");            Connection.setrequestproperty ("Charset", "UTF-8"); The delimiter must be specified in the Content-type request header Connection.setrequestproperty ("Content-type", "multipart/form-data;boundary=" + Bou            Ndary); Define data write stream, ready to upload file DataOutputStream dos = new DataoutputstreAM (Connection.getoutputstream ());            Dos.writebytes (Dividerstart + boundary + nextline); Set up information related to uploading files dos.writebytes ("Content-disposition:form-data; Name=\ "File\";            Filename=\ "" + filepath.substring (Filepath.lastindexof ("/") + 1) + "\" "+ nextline);            Dos.writebytes (nextline);            FileInputStream fis = new FileInputStream (FilePath);            byte[] buffer = new byte[1024 * 32];            int count; Reads the contents of the file and writes the OutputStream object while ((count = fis.read (buffer))! =-1) {dos.write (buffer, 0, Coun            T);            } fis.close ();            Dos.writebytes (nextline);            Dos.writebytes (Dividerstart + boundary + Dividerstart + nextline);            Dos.flush ();            Start reading information from the server InputStream is = Connection.getinputstream ();            BufferedReader br = new BufferedReader (new InputStreamReader (IS, "UTF-8")); String result = Br.readline ();           Dos.close ();            Is.close ();            Connection.disconnect ();        return result;        } catch (IOException e) {e.printstacktrace ();    } return null; }

Server-side code:

Package webserver//receives client-uploaded files via http//date:2015-3-25 16:18:33import ("FMT" "Io/ioutil" "Log" "Net/http" "OS") func Uploadbase () {fmt. Println ("This is Uploadbase") http. Handlefunc ("/httpuploadfile", Handleuploadfile) http. Listenandserve (": 8086", nil) if err! = Nil {fmt. PRINTLN ("Listenandserve error:", err.) Error ())}}func Handleuploadfile (w http. Responsewriter, R *http. Request) {fmt. PRINTLN ("Client:", r.remoteaddr) file, Fileheader, err: = R.formfile ("file") if err! = Nil {log. Fatal ("Formfile:", err.) Error ()) Return}defer func () {if err: = file. Close (); Err! = Nil {log. Fatal ("Close:", err.) Error ()) Return}} ()//file name filename: = Fileheader.filenameif filename = = "" {log. Fatal ("Param filename cannot be null.") return}//file Contents bytes, err: = Ioutil. ReadAll (file)//write to the server-side local file Outputfilepath: = "/home/admin/Desktop/" + Filenameerr = ioutil. WriteFile (Outputfilepath, Bytes, os. MODEPERM) If err! = Nil {log. Fatal ("Writefileerror:", err.) Error ()) return}w.write ([]byte) ("Upload file succeeded! "))}