package test;

import javax.ejb.Stateless;

import ...

@Stateless

public class CityInvoker {

    public CityResponse getCity() {

        CityResponse cityResponse = null;

        CityService cityService = ApplicationContextUtils.getCityService();

        try {

            cityResponse = cityService.findCityByCode(RequestBuilder

                    .buildCityFindRequest());

        } catch (LMSException e) {

            e.printStackTrace();

        }

        return cityResponse;

    }

...

package test.rest;

import javax.ejb.EJB;

import javax.ws.rs.*;

import javax.ws.rs.core.MediaType;

import javax.xml.bind.JAXBElement;

import javax.xml.namespace.QName;

@Path("/")

public class TestService {

    final String XMLNS_NAMESPACE = "http://yjmyzz.cnblogs.com/rest/service";

    final String ROOT_NODE = "root";

    @EJB

    CityInvoker cityInvoker;

    @GET

    @Path("/findCity")

    @Produces(MediaType.APPLICATION_XML)

    public JAXBElement<CityDto> findCity() {

        JAXBElement<CityDto> result = new JAXBElement<CityDto>(new QName(

                XMLNS_NAMESPACE, ROOT_NODE), CityDto.class, cityInvoker

                .getCity().getCities().get(0));

        return result;

    }

...