java - FormHttpMessageConverter filename from byte array -

i'm trying upload file post request. post must of enclosure-type multipart/form-data. insert file byte array:

multivaluemap<string, object> requestparameters = new linkedmultivaluemap<string, object>();  byte[] image=getimage();  // ... adding parameters in requestparameters        // todo filename requestparameters .add("file", image); 

then make post request org.springframework.http.converter.formhttpmessageconverter:

formhttpmessageconverter multipartformconverter = new formhttpmessageconverter();         multipartformtemplate = new resttemplate();         multipartformtemplate.setmessageconverters(collections.<httpmessageconverter<?>> singletonlist(multipartformconverter));          responseentity<string> uploadanswer=multipartformtemplate.postforentity(freeplanresponse.geturl(), requestparameters, string.class); 

the problem - cant found, how change filename. result default filename (${filename}) file hosting, i'm using: image hosting. uses: amazon s3. here post example >>

i found solution:

inherit formhttpmessageconverter , override getfilename method:

public class formhttpmessageconverterimagename extends formhttpmessageconverter {      private string filename;      public void setfilename(string filename){         this.filename=filename;     }      @override     protected string getfilename(object part) {         return filename;     } } 

but maybe there more beautifull solution.