struts2 访问或添加request/session/application属性

第一种方法：

ActionContext ctx = ActionContext.getContext();
    ctx.put("r1", list);//向request中添加属性
    ctx.getSession().put("s1",list);//向session中添加属性
    ctx.getApplication().put("a1", list);//向application中添加属性

    HttpSession session =null;
            session = ServletActionContext.getRequest().getSession();
            if(session.getAttribute("user") != null) {
                session.removeAttribute("user");
            }
            session.setAttribute("user", user);
    Map<String,Object> session = null;
            session = ActionContext.getContext().getSession();
            if(session.containsKey("user")){
                session.remove("user");
            }  

            session.put("user", user);

第二种方法：

使用 ServletRequestAware接口

    public class LoginAction4 extends ActionSupport implements ServletRequestAware {  

        private HttpServletRequest request;
        private HttpSession session;
        private ServletContext application;  

        public String execute() {
            request.setAttribute("r1", "r1");
            session.setAttribute("s1", "s1");
            application.setAttribute("a1", "a1");
            return SUCCESS;
        }  

        @Override
        public void setServletRequest(HttpServletRequest request) {
            this.request = request;
            this.session = request.getSession();
            this.application = session.getServletContext();
        }  

    }

struts2访问request、session、application属性

第一种方法：

使用struts tag：

    <s:property value="#request.r1"/>
    <s:property value="#session.s1"/>
    <s:property value="#application.a1"/>

第二种方法：

使用jsp对象

    <%=request.getAttribute("r1") %> <br />
    <%=session.getAttribute("s1") %> <br />
    <%=application.getAttribute("a1")%> <br />