FormFile foto = articleForm.getFoto();
                 if ((foto !=  null )&&(foto.getFileSize() >  0 )) {
                    InputStream in =  null ;
                    OutputStream out =  null ;
                    String foto_name = foto.getFileName();
                    foto_name = articleBean.generateFotoName()+foto_name.substring(foto_name.lastIndexOf("."));
                    String full_foto_name = request.getSession().getServletContext().getRealPath(foto_name);

                     try  {
                        in = foto.getInputStream();
                        out =  new  BufferedOutputStream( new  FileOutputStream(full_foto_name));

                         byte [] buffer =  new   byte [ 512 ];
                         while  (in.read(buffer) != - 1 ) {
                            out.write(buffer);
                        }
                    }  finally  {
                         if  (out !=  null ) out.close();
                         if  (in !=  null ) in.close();
                    }
                    article.setFoto_name(foto_name);
                }  else  article.setFoto_name("");

 public   class  ArticleBean {
    ...

     public  String generateFotoName() {
        String name = "images/foto_";

         for ( int  i= 0 ; i< 7 ; i++) {
             Double  a = Math.random()* 10 ;
            name +=  Byte .valueOf(a.byteValue()).toString();
        }
         return  name;
    }