通过ApplicationContextAware获取bean

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加载Spring配置文件时，如果Spring配置文件中所定义的Bean类实现了ApplicationContextAware 接口，那么在加载Spring配置文件时，会自动调用ApplicationContextAware 接口中的

public void setApplicationContext(ApplicationContext context) throws BeansException

方法，获得ApplicationContext 对象。

前提必须在Spring配置文件中指定该类。

public class SpringContextHolder implements ApplicationContextAware {     /**      * 以静态变量保存ApplicationContext,可在任意代码中取出ApplicaitonContext.      */private static ApplicationContext context;/** * 实现ApplicationContextAware接口的context注入函数, 将其存入静态变量. */public void setApplicationContext(ApplicationContext context) {SpringContextHolder.context =context;}public static ApplicationContext getApplicationContext() {return context;}/** * 从静态变量ApplicationContext中取得Bean, 自动转型为所赋值对象的类型. */public static <T> T getBean(String name) {return (T) context.getBean(name);}}

bean中：

<bean id="springContextHolder" class="com.enation.framework.context.spring.SpringContextHolder" />

调用：

ICartManager cartManager = SpringContextHolder.getBean("cartManager");

正常情况：

public class AppManager extends ContextLoaderListener implements  ServletContextListener {private ServletContext context;private WebApplicationContext webApplicationContext;public void contextInitialized(ServletContextEvent sce) {this.context = sce.getServletContext();this.webApplicationContext = WebApplicationContextUtils.getRequiredWebApplicationContext(context);this.context.setAttribute("WEBAPPLICATIONCONTEXT", webApplicationContext);｝

HttpSession session = request.getSession();WebApplicationContext webApplicationContext = (WebApplicationContext)session.getServletContext().getAttribute("WEBAPPLICATIONCONTEXT");UnsubscribeEmailFacade unsubscribeEmailFacade = (UnsubscribeEmailFacade)webApplicationContext.getBean("unsubscribeEmailFacade");

法2：

org.springframework.web.context.ContextLoader

// 获取spring bean容器WebApplicationContext wac = ContextLoader.getCurrentWebApplicationContext();ISysConfigDao sysconfigdao = (ISysConfigDao) wac.getBean("iSysConfigDao");

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