java - 如何使用ApplicationListener ConfigurableApplicationContext启动的服务

Question

我使用springMvc和mybatis。从项目中复制BaseService和BaseServiceImpl。

public interface BaseService<Record, Example> {
    //init mybatis mapper
    void initMapper();
}

BaseServiceImpl

public abstract class BaseServiceImpl<Mapper, Record, Example> implements BaseService<Record, Example> {

public Mapper mapper;
@Override
public void initMapper() {
    this.mapper = SpringContextUtil.getBean(getMapperClass());
}


public Class<Mapper> getMapperClass() {
    return (Class<Mapper>) ((ParameterizedType) getClass().getGenericSuperclass()).getActualTypeArguments()[0];
}

EntityServiceImpl

@Service
@Transactional
@BaseService
public class EntityServiceImpl extends BaseServiceImpl<EntityMapper, Entity, EntityExample> implements EntityService {
}

我初始化 BaseService 使用此代码。

@Component
public class ApplicationContextListener implements ApplicationListener<ContextRefreshedEvent> {

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

    @Override
    public void onApplicationEvent(ContextRefreshedEvent contextRefreshedEvent) {
        // root application context
        if(null == contextRefreshedEvent.getApplicationContext().getParent()) {
            LOGGER.debug(">>>>> spring init finished <<<<<");
            //  call BaseService initMapper method
            ConfigurableApplicationContext applicationContext = (ConfigurableApplicationContext)contextRefreshedEvent.getApplicationContext();
            Map<String, Object> baseServices = applicationContext.getBeansWithAnnotation(BaseService.class);
            for(Object service : baseServices.values()) {
                try {
                    Method initMapper = service.getClass().getMethod("initMapper");
                    initMapper.invoke(service);
                } catch (Exception e) {
                    LOGGER.error("init BaseService initMapper failed", e);
                    e.printStackTrace();
                }
            }

          }
    }

}

项目启动时，entityServiceImpl.initMapper方法已被调用

@Override
    public void initMapper() {
        this.mapper = SpringContextUtil.getBean(getMapperClass());
    }

但是当我在 Controller 中使用entityService时。无法使用已由ApplicationListener初始化的entityService。这就是我尝试使用entityService的方式

@Conroller 
public class LoginController {
@Resource
EntityService EntityService1;
@Autowired
EntityService EntityService2;

EntityService EntityService3 = (EntityService)SpringContextUtil.getBean(EntityService.class);
}

使用Idea调试，我可以找到一个具有非空映射器的EntityService。但在 Controller 中，三个 EntityService 映射器全部为空。我如何将 EntityService 与由 ApplicationListener 初始化的映射器一起使用？

Answer 1

Spring使用beanPostProcessors链，它可以通过CGLIB或动态代理修改您的初始类。所以 this.mapper = SpringContextUtil.getBean(getMapperClass());可能无法按您的预期工作