Get json data from a posted URI in postman in java

Question

I have been trying to get JSON data but it seems I am using the wrong syntax. What syntax is appropriate? This is my code

@Path("/jsondata")
@POST
@Consumes("application/json")
@Produces("application/json")
public JSONObject personal(@JSONParam("")JSONObject json) throws JSONException{
    String name = json.getString("name");
    String age = json.getString("age");
    String msg = "You entered two things";
    String doc = "{\"name\":\""+name+"\",\"age\":\""+age+"\",\"msg\":\""+msg+"\"}";
    JSONObject outJson = new JSONObject(doc);

    return outJson;
}

Am getting error on the fifth line at @JSONParam . What should i do. And how do I get the name and age from the json

Answer 1

Well actually any JAX-RS implementation should be able to support JSON natively such that you are supposed to manipulate POJO instead of JSON object.

• When you set @Consumes("application/json") , the framework knows that the input data is in JSON format so it will deserialize it into the expected Java Object Type.
• When you set @Produces("application/json") , the framework knows that the result is in JSON format so it will serialize the returned Java Object in JSON format.

Here is an example from this article

@Path("/json/metallica")
public class JSONService {

    @GET
    @Path("/get")
    @Produces(MediaType.APPLICATION_JSON)
    public Track getTrackInJSON() {
        Track track = new Track();
        track.setTitle("Enter Sandman");
        track.setSinger("Metallica");
        return track;
    }

    @POST
    @Path("/post")
    @Consumes(MediaType.APPLICATION_JSON)
    public Response createTrackInJSON(Track track) {
        String result = "Track saved : " + track;
        return Response.status(201).entity(result).build();
    }
}

As you can see getTrackInJSON is annotated with @Produces(MediaType.APPLICATION_JSON) such that it can return the object Track , the framework will convert it into JSON format.

As you can see createTrackInJSON is annotated with @Consumes(MediaType.APPLICATION_JSON) and has one parameter which is of type Track such that the framework will parse the input data to provide directly an instance of Track as parameter to the method.