how to send json data from a server to client in spring

Question

i am trying to get json data and store data in db and send json object about status of operation i am able to store data in db but my return json object is not working fine i am not getting json object my java code:

@RequestMapping(value = "/a",headers="Content-Type=application/json",method = RequestMethod.POST)
    @ResponseBody
    public JSONObject data(@RequestBody String load) 
        {
           org.json.JSONObject obj = new org.json.JSONObject();
           obj.put("Status", "Success");
          obj.put("Details","DB updated");
          return obj;
         }

You should use a `Map` instead of `JSONObject`. The mechanisms of `org.json.JSONObject` most likely clash with how Jackson works and what it expects. — kryger, Sep 01 '15 at 10:26
Response is here http://stackoverflow.com/questions/19204048/returning-jsonobject-using-responsebody-in-springmvc — mommcilo, Sep 01 '15 at 10:27

Tobias Kremer · Accepted Answer · 2015-09-01T11:17:32.393

In your @RequestMapping annotation define produces = MediaTyp.APPLICATION_JSON_VALUE. Your method should then just return a simple Map.

What is returned is actually controlled by the accepts Header in the request. So as an alternativ you could always ensure that your request asks for the right typ. But setting produces in the annotation is in my opinion a good idea as Spring does some auto conversions based on libraries available on the classpath. This might cause security issues if you do not control the type by hand.

edit:

Instead of a simple Map you could also just return any Java Object as long as it can be serialized by Jackson. You can control serialization using annotation in the Object class in this case.

Also you need the Jaclson library on the classpath for this to work (should be the case if you use a basic Spring Boot Web App).

Here is the offical Spring guide on how to build sutch a service: http://spring.io/guides/gs/rest-service/

how to send json data from a server to client in spring

1 Answers1