学步园

session的获取：ActionContext.getContext().getSession()

servlet的获取 ServletActionContext

action上下文：ActionContext
  通过ActionContext可以获得：

        ActionContext ctx = ActionContext.getContext();
        //Returns a Map of the ServletContext when in a servlet environment or a generic application level Map otherwise.
        Map<String, Object> smap = ctx.getApplication();
        //struts2的context
        Map<String, Object> s2map = ctx.getContextMap();
        //获取原生的HttpServletRequest
        HttpServletRequest request = (HttpServletRequest) ctx.get(StrutsStatics.HTTP_REQUEST);
        //获取请求参数
        Map<String, Object> pmap = ctx.getParameters();
        //Session
        Map<String, Object> session = ctx.getSession();

如果是个通过spring实现的ioc应用，则可以获得spring的上下文：

WebApplicationContext context = (WebApplicationContext) smap.get(WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE);
DataSource dateSource = (DataSource) context.getBean("dataSource");