Send a POST request using Xutils, carry JSON and picture binary file data Get server side return JSON data

Interface Documentation:

Change Avatar interface User/change_avatar send data http Post body (altogether 2 to Key-value): json={"UID": "1", "Sid": " 0123456789abcdef0123456789abcdef "," ver ":" 1 "," request ": {}}file= picture binary file data return data {" ret ": 0," response ": {    " status " : 1,    "url": "http://192.168.1.200:8088/thumb.php?src=984340199_1667541218_1540991412.jpg&t=a&w=112 &h=112 "    }}

Problems encountered:
First, when the binary request body parameters are encapsulated, the delivery parameters are insufficient, causing the server side to not recognize the POST request.

Httputils http =Newhttputils (); Requestparams params=NewRequestparams (); Params.addbodyparameter ("JSON", JSON);  for(inti = 0; I < files.size (); i++) {            if(Files.get (i)! =NULL) {                Try{params.addbodyparameter ("File" +i,NewFileInputStream (Files.get (i)), Files.get (i). Length (), Files.get (i) . GetName (),"Application/octet-stream"); } Catch(FileNotFoundException e) {e.printstacktrace (); }            }        }

Params.addbodyparameter (key, stream, length, fileName, MimeType);

Then, when the POST request is sent, an async method is used, resulting in the inability to return the value returned by the server.

        NULL ;         Try {            //  synchronous method, gets the server-side returned stream            responsestream responsestream = Http.sendsync ( Httpmethod.post, URL,                    params);             = responsestream.readstring ();         Catch (Exception e) {            e.printstacktrace ();        }         return s;

Responsestream Responsestream = Http.sendsync (method, URL, params);

The complete code to send the POST request is attached below:

    /*** Send a POST request, carry JSON and multiple file parameters to get the result returned by the server (JSON format) *@paramURL Request Address *@paramJSON string encapsulated in the JSON request body *@paramlist<file> Uploading multiple files *@returnresults returned by the String server*/     Public StaticString sendpost (string URL, string json, list<file>files) {httputils http=Newhttputils (); Requestparams params=NewRequestparams (); Params.addbodyparameter ("JSON", JSON); if(files.size () = = 1) {            Try{params.addbodyparameter ("File",                        NewFileInputStream (files.get (0)), Files.get (0). Length (), Files.get (0). GetName (),"Application/octet-stream"); } Catch(FileNotFoundException e) {e.printstacktrace (); }        } Else {             for(inti = 0; I < files.size (); i++) {                if(Files.get (i)! =NULL) {                    Try{params.addbodyparameter ("File" +I,NewFileInputStream (Files.get (i)), Files.get (i). Length (), Files.get (i). GetName (), "Application/octet-stream"); } Catch(FileNotFoundException e) {e.printstacktrace (); } }}} String s=NULL; Try {            //synchronization method to get the stream returned by the server sideResponsestream Responsestream =http.sendsync (httpmethod.post, url, params); S=responsestream.readstring (); } Catch(Exception e) {e.printstacktrace (); }        returns; }

Send a POST request using Xutils, carry JSON and picture binary file data Get server-side return JSON data