JAX-RS - @Produces and @Consumes Examples

import com.logicbig.example.Item;
import com.logicbig.example.DataService;

import javax.ws.rs.*;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.UriInfo;
import java.util.List;

@Path("items")
public class ItemRestService {

    @Context
    private UriInfo uriInfo;

    private DataService dataService = DataService.getInstance();

    @GET
    @Produces(MediaType.APPLICATION_JSON)
    public List<Item> getItems() {
        return dataService.getItemList();
    }


    @Path("{sku}")
    @PUT
    @Consumes(MediaType.APPLICATION_JSON)
    public Response createItem(Item item,
                          @PathParam("sku") String sku) {

        System.out.println(item);
        if (dataService.itemExists(sku)) {
            //status code 204
            System.out.println("no content");
            return Response.noContent()
                      .build();
        } else {
            dataService.createItem(item, sku);
            //status code 201
            //sends back new URI in header key = 'LOCATION'
            System.out.println("good");
            return Response.created(uriInfo.getAbsolutePath())
                      .build();
        }
    }

    @GET
    @Path("{sku}")
    @Produces(MediaType.APPLICATION_JSON)
    public Response getCustomer(@PathParam("sku") String sku) {
        Item item = dataService.getItemBySku(sku);
        if (item == null) {
            return Response.status(Response.Status.NOT_FOUND)
                      .build();
        } else {
            return Response.ok()
                      .entity(item)
                      .build();
        }
    }
}

import javax.ws.rs.*;

@Path("orders")
@Produces("text/plain")
@Consumes("text/plain")
public class OrderService {

    @GET
    @Path("{orderId}")
    public String getOrderAsTextById2(
            @PathParam("orderId") String orderId) {
        return "returning order with id " + orderId;
    }

    @GET
    @Path("{orderId}")
    @Produces("application/json")
    public String getOrderAsHtmlById(
            @PathParam("orderId") String orderId) {
        //returning JSON response
        return "{\"orderId\": \"" + orderId + "\", \"customer\": John}";
    }
}