获取当前的spring容器ApplicationContext

方法一：（获取当前的spring容器，任何java类中适用）

          ServletContext application = ServletActionContext.getServletContext();

            ApplicationContext act = ContextLoader.getCurrentWebApplicationContext();

            UserService userService = (UserService) act.getBean("userService");

方法二：（重新加载spring容器）

ApplicationContext ac = new FileSystemXmlApplicationContext("applicationContext.xml");

方法三：（通过request或session加载spring容器）

 ApplicationContext ctx = WebApplicationContextUtils.getWebApplicationContext(request.getSession().getServletContext());