如何使用Grizzly/JJAX-RS创建DAO/Service层

对于这个JAX-RS应用程序,我使用Grizzly而不是Glassfish。我是这项技术的新手,所以我一直在谷歌上搜索,似乎找不到如何在应用程序中设置Service/DAO层的好纲要。

下面是我的工作原型。

我的资源

@Path("/helloworld")
@Stateless
public class MyResource {

    @EJB //DOESN'T WORK - how do I map this service to this resource?
    WorkflowService workflowService;

    @GET
    @Produces(MediaType.TEXT_PLAIN)
    public String TestRequest() {
        Workflow workflow = new Workflow();
        workflow.setName("test");

        workflowService.save(workflow);

        return "Workflow ID:";
    }
}

我的刀

public class WorkflowDao {

    @PersistenceContext(unitName = "unit")
    private EntityManager entityManager;

    public int save(Workflow workflow) {
        entityManager.persist(workflow);
        return workflow.getId();
    }
}

我的服务

@Stateless
public class WorkflowService {

    @EJB //I know EJB is probably wrong here, not sure what else to do yet.
    WorkflowDao workflowDao;

    public int save(Workflow workflow) {
        int id = workflowDao.save(workflow);
        return id;
    }
}

使现代化 -我意识到EJB不适用于我的设置。所以我的问题是,是什么?如何在我的资源中访问该服务?

--------------最终/工作代码--------------

资源

@Path("/helloworld")
public class MyResource {

    WorkflowService workflowService;

    public MyResource() {
        workflowService = new WorkflowService();
    }

    @GET
    @Produces(MediaType.TEXT_PLAIN)
    public String TestRequest() {
        Workflow workflow = new Workflow();
        workflow.setName("test");

        workflowService.save(workflow);

        return "Workflow ID:";
    }
}

服务

public class WorkflowService {

    WorkflowDao workflowDao;

    public WorkflowService() {
        workflowDao = new WorkflowDao();
    }

    public int save(Workflow workflow) {
        int id = workflowDao.save(workflow);
        return id;
    }
}

道

@Singleton
public class WorkflowDao {

    private EntityManager entityManager;

    public int save(Workflow workflow) {
        getEntityManager().persist(workflow);
        return workflow.getId();
    }

    protected EntityManager getEntityManager() {
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("unit");
        EntityManager em = emf.createEntityManager();
        return em;
    }
}