问@EJB注入dao

EN

@Entity
@Table(name = "User")
@NamedQuery(name = "User.findByAddressName",
            query = "select u from User u where u.userAddress.addressName = :addressName")
public class User implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id")
    private long userID;

     @Column(name = "userFirstName", length = 45)
     private String userFirstName;

    @Column(name = "userLastName", length = 45)
    private String userLastName;

    @Column(name = "userBirthDate")
    private Date userBirthDate;

    @Column(name = "userPhone")
    private String userPhone;

    @Column(name = "userPassword")
    private String userPassword;

    @OneToOne(cascade = CascadeType.ALL, mappedBy = "addressUser")
    private Email userAddress;

    public User() {
    }

    public User(String userFirstName, String userLastName, Date userBirthDate, String userPhone, String userPassword) {
        this.userFirstName = userFirstName;
        this.userLastName = userLastName;
        this.userBirthDate = userBirthDate;
        this.userPhone = userPhone;
        this.userPassword = userPassword;
    }
}

@Stateless
public class UserBean {

    @PersistenceContext(unitName = "server")
    private EntityManager em;

   public User getUserByEmail(String email) {
       TypedQuery<User> queryUser = em.createNamedQuery("User.findByAddressName",
               User.class);
       queryUser.setParameter("addressName", email);
       return queryUser.getSingleResult();
   }

}

@Stateless
public class LoginService {
    @EJB
    UserBean userBean;

    public boolean loginUser(String userEmail, String userPass) {
        User user = userBean.getUserByEmail(userEmail);

        if (userPass.equals(user.getUserPassword())) {
            return true;
        } else return false;
    }
}

boolean b = new LoginService().loginUser("user", "user1");