Struts2學習筆記之域屬性的添加和訪問

Struts2學習筆記

第八記：域屬性的添加和訪問

（1）、設置訪問屬性

      1-1：通過ActionContext設置訪問屬性

           public String execute(){

                        ActionContext act=ActionContext.getContext();

                        act.getApplication().put("application","this is application scope");

                       act.getSession().put("session","this is session scope");

                       act.put("request","this is request scope");

                       return "SUCCESS";

          }

      1-2：通過ServletActonContext設置屬性

      原理：獲取到HttpServletRequest對象，利用setAtrribute()來實現。

       public String requestAndServletContext(){

                       HttpServletRequest   request=ServletActionContext.getRequest();

                       ServletContext servletContext=ServletActionContext.getServletContext();

                       servletContext.setAttributet("application","this is application scope");

                       request.getSession().setAttributet("session","this is session scope");

                       request.setAttributet("request","this is request scope");

                       return "SUCCESS";

          }

（2）、訪問設置的屬性

       在success.jsp頁面中用EL表達式獲取值：

      ${applicationScope.application}<br/>

      ${sessionScope.session}</br>

      ${requestScope.request}<br/>