ApplicationContextAware

ApplicationContextAware用法

当一个类实现了这个接口之后，这个类就可以方便的获得ApplicationContext对象（spring上下文），Spring发现某个Bean实现了ApplicationContextAware接口，Spring容器会在创建该Bean之后，自动调用该Bean的setApplicationContext（参数）方法，调用该方法时，会将容器本身ApplicationContext对象作为参数传递给该方法。

案例

import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.stereotype.Component;

@Component
public class ZYLApplicationContextAware implements ApplicationContextAware {


    private static ApplicationContext context;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        context = applicationContext;
    }

    public static ApplicationContext getApplicationContext(){
        return context;
    }
    /**
     * 通过name获取 Bean
     * @param name beanName
     * @return Object
     */
    public static Object getBean(String name){
        return getApplicationContext().getBean(name);
    }

    public static <T> T getBean(Class<T> requiredType) throws BeansException{
        return getApplicationContext().getBean(requiredType);
    }
}