通過ApplicationContextAware獲取bean

Spring中提供一些Aware相關接口，像是BeanFactoryAware、 ApplicationContextAware、ResourceLoaderAware、ServletContextAware等等，實作這些 Aware接口的Bean在被初始之後，可以取得一些相對應的資源，例如實現BeanFactoryAware的Bean在初始後，Spring容器將會注入BeanFactory的實例，而實現ApplicationContextAware的Bean，在Bean被初始後，將會被注入 ApplicationContext的實例等等

實現了ApplicationContextAware接口，就可以通過ApplicationContext的實例獲取到我們想要的bean

public class SpringFactory implements ApplicationContextAware {
	private static ApplicationContext context;
	@SuppressWarnings("static-access")
	public void setApplicationContext(ApplicationContext applicationContext)
			throws BeansException {
		this.context = applicationContext;
	}
	public static Object getObject(String id) {
		Object object = null;
		object = context.getBean(id);
		return object;
	}	
}

<bean id="springfactory" class="com.april.service.impl.SpringFactory"></bean>

例如可以在javaBean中獲取

TestDaoImpl testDao = (TestDaoImpl) SpringFactory.getObject("testDao")