spring - How to send information from a server to Android -

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i've got server. how can send information server android app? 1 of controller methods:

@requestmapping("/city/{cityid}") public modelandview showcity(@pathvariable("cityid") int cityid){     modelandview mav=new modelandview("city/citydetails");     mav.addobject(this.whatsnewservice.findcitybyid(cityid));     return mav; }

i case can not pass modelandview (actually can). best option use rest. can make method rest api method. , pass jason object.

in general, web applications expose service through rest api used third part applications or power mobile applications

@restcontroller public class citycontroller {     @autowire    private whatsnewservice whatsnewservice;     @requestmapping(method = requestmethod.get, value = "/city/{cityid}")    public city showcity(@pathvariable("cityid") int cityid){      return this.whatsnewservice.findcitybyid(cityid);    }  }

or can use same @controller class , 

@controller public class citycontroller {     @autowire    private whatsnewservice whatsnewservice;     @requestmapping(method = requestmethod.get, value = "/city/{cityid}")    public @responsebody city showcity(@pathvariable("cityid") int cityid){      return this.whatsnewservice.findcitybyid(cityid);    }  }

in android client side can use retrofit library map josn object application object.


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