用@Component注解的类中@Autowired为null_方法后调用component类,类中autowired报空 applicationcontext-优快云博客

本文链接：https://blog.youkuaiyun.com/BinshaoNo_1/article/details/112969071

该博客介绍了如何创建一个工具类ApplicationContextUtils，实现ApplicationContextAware接口，以静态方式获取Spring容器中的Bean。通过重写setApplicationContext方法，可以方便地在需要的地方调用getBean方法直接获取指定名称的Bean。这种方式简化了在Spring应用中获取Bean的过程。

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编写一个工具类实现ApplicationContextAware接口，重写setApplicationContext方法

@Component
public class ApplicationContextUtils implements ApplicationContextAware {

    private static ApplicationContext context;


    /**
     * Set the ApplicationContext that this object runs in.
     * Normally this call will be used to initialize the object.
     * <p>Invoked after population of normal bean properties but before an init callback such
     * as {@link InitializingBean#afterPropertiesSet()}
     * or a custom init-method. Invoked after {@link ResourceLoaderAware#setResourceLoader},
     *  and
     * {@link MessageSourceAware}, if applicable.
     *
     * @param applicationContext the ApplicationContext object to be used by this object
     * @throws ApplicationContextException in case of context initialization errors
     * @throws BeansException              if thrown by application context methods
     * @see BeanInitializationException
     */
    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        context = applicationContext;
    }

    /**
     * 获取bean
     * @param beanName
     * @return
     */
    public static Object getBean(String beanName) {
        return context.getBean(beanName);
    }
}

在需要引入的类中获取bean

public Bean getTemp() {
        return (Bean) ApplicationContextUtils.getBean("temp");
    }

这样就引入进来了，直接调用就可以