对象无法注册到Spring容器中,手动从spring容器中拿到我们需要的对象

当前对象没有注册到spring容器中,此时无法new object()  的方式创建对象,否则所有@Autowired 注入的对象都为null;

处理方式:

  手动创建一个类@Component注册到Spring容器  并实现ApplicationContextAware 接口,实现对象方法,完成获取spring容器的通道,再通过通道获取我们所需要的对象,此对象里面关联注入的其他对象都正常,可以正常使用了

/**
 * 用于手动获取spring无法注册的对象
 */
@Component
public class SpringUtil implements ApplicationContextAware {

    private static ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        if(SpringUtil.applicationContext == null) {
            SpringUtil.applicationContext = applicationContext;
        }
        System.out.println("---------------------------------------------------------------------");

        System.out.println("---------------------------------------------------------------------");

        System.out.println("---------------me.shijunjie.util.SpringUtil------------------------------------------------------");

        System.out.println("========ApplicationContext配置成功,在普通类可以通过调用SpringUtils.getAppContext()获取applicationContext对象,applicationContext="+SpringUtil.applicationContext+"========");

        System.out.println("---------------------------------------------------------------------");
    }

    //获取applicationContext
    public static ApplicationContext getApplicationContext() {
        return applicationContext;
    }

    //通过name获取 Bean.
    public static Object getBean(String name){
        return getApplicationContext().getBean(name);
    }

    //通过class获取Bean.
    public static <T> T getBean(Class<T> clazz){
        return getApplicationContext().getBean(clazz);
    }

    //通过name,以及Clazz返回指定的Bean
    public static <T> T getBean(String name,Class<T> clazz){
        return getApplicationContext().getBean(name, clazz);
    }

}

 

 

没有注册到Spring容器的对象,调用此通道即可获取spring容器的对象:

  获取WordDictionariesEntityService对象

wordDictionariesEntityService = (WordDictionariesEntityService) SpringUtil.getBean(WordDictionariesEntityService.class);

 

posted @ 2018-10-22 15:53  陌笠人灬苼  阅读(969)  评论(0编辑  收藏  举报