Question

我正在使用Spring 4.3.0 annotation with java config，我制作了一个小型的Spring MVC Web项目。我试图在@Controller中使用@Autowire注释，它完全正常。但这在@Service或@Repository

中起作用

@Controller 的代码：

@Controller
public class LoginController 
{   
  @Autowired
  private EmployeeInfo employeeInfo;     //works perfectly fine

  private static final Logger LOGGER = LoggerFactory.getLogger(LoginController.class);

  private AuthenticationService authenticationService = AuthenticationService.getAuthenticationInstance();

  @RequestMapping(value = "/login.jsp" , method = RequestMethod.GET)
  public ModelAndView userLoginPage(){
   return new ModelAndView("Login");        
  }
}

@Service 类

@Service
public class AuthenticationService 
{
   @Autowired
   private EmployeeInfo employeeInfo;   // this gives NULL

   private static final Logger LOGGER = LoggerFactory.getLogger(AuthenticationService.class);

   private static AuthenticationService authenticationService;

   LoginDao loginDao = LoginDao.getLoginInstance();

   private boolean firstTimeLogin = false;

   public static AuthenticationService getAuthenticationInstance(){
       if(authenticationService == null)
           authenticationService = new AuthenticationService();
       return authenticationService;
   } 
}

@Configuration 类

@EnableWebMvc
@Configuration
@PropertySource("classpath:application.properties")
@ComponentScan(basePackages = "programs.examples")
public class AppConfig
{
   @Bean
   public ViewResolver jspViewResolver() {
       UrlBasedViewResolver resolver = new ChainableUrlBasedViewResolver();
       resolver.setPrefix("/WEB-INF/view/");
       resolver.setSuffix(".jsp");
       resolver.setOrder(0);
       return resolver;
   }

   @Bean
   public ViewResolver jspViewResolver2() {
       InternalResourceViewResolver resolver = new InternalResourceViewResolver();
       resolver.setPrefix("/WEB-INF/view2/");
       resolver.setSuffix(".jsp");
       resolver.setOrder(1);
       return resolver;
      }

   @Bean                       // @Component is used with EmployeeInfo
   public EmployeeInfo employeeInfo(){    
     return new EmployeeInfo();
   }
}

另外如果我可以在@Controller中没有 AnnotationConfigApplicationContext 来初始化bean，那么我们真的需要AnnotationConfigApplicationContext吗？

先谢谢

修改

这是一个非常天真的问题，所以如果有人像我一样理解，这就是答案：

自动装配在@Controller中工作但在@Service中没有，因为我使用new手动初始化服务对象，因此自动初始化不能在@Service类中工作

关于ApplicationAnnotation我们不需要，因为bean在启动时通过组件扫描初始化，这是整个弹簧点

我们需要AnnotationConfigApplicationContext来初始化bean吗？

0 个答案: