1:    spring中获取ApplicationContext

public class ApplicationContextUtil implements ApplicationContextAware 即可

2:   spring mvc中获取Request

<listener>

        <listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>

    </listener>

HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();

3:   spring mvc中获取WebApplicationContext

3.1 : WebApplicationContext ctx = ContextLoader.getCurrentWebApplicationContext();

3.2 : 

HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();

WebApplicationContext ctx = WebApplicationContextUtils.getRequiredWebApplicationContext(request.getServletContext());