spring中获取bean的方式

获取bean的方式

1.可以通过上下文的getBean方法

2.可以通过@Autowired注入

定义controller

@RestController

@RequestMapping("/api")

public class ApiUserController {

    /**

     * 上下文对象实例

     */

    @Autowired

    private  ApplicationContext applicationContext;

    @Autowired

    private IUserService userService;

    @RequestMapping("/getById")

    public RestResponse<User> getUser(Long id) {

        //使用@service注解上的别名进行获取bean

        IUserService service = (IUserService) applicationContext.getBean("IUserService");

        return service.getUserById(id);

    }

    @RequestMapping("/getByIdNoHytrix")

    public RestResponse<User> getUserNoHytrix(Long id) {

        return userService.getUserByIdNoHytrix(id);

    }

}

定义service，注解上的IUserService为自定义的名字，getBean()只能用它

@Service("IUserService")

public class UserService implements IUserService {

    @Autowired

    private UserDao userDao;

    public RestResponse<User> getUserById(Long id) {

        return userDao.getUseById(id);

    }

    public RestResponse<User> getUserByIdNoHytrix(Long id) {

        return userDao.getUseByIdNoHytrix(id);

    }

}