struts2访问或添加request/session/application属性

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struts2不能直接访问到servletAPI，但是它对其进行了封装，下面是action或jsp访问的代码

public String scope() throws Exception{ ActionContext ctx=ActionContext.getContext(); ctx.getApplication().put("app","应用范围");//往servletContext放入app ctx.getSession().put("ses","session范围");往servletSession放入Session范围 ctx.put("req","request范围");//往request放入 return "scope";} JSP:<body>${applicationScope.app}<br/>${sessionScope.ses}<br/>${requestScope.req}<br/></body>

如何获取作用域对象？
方法一：通过ServletActionContext类直接获取
public String rsa() throws Exception{ HttpServletRequest request=ServletActionContext.getRequest(); ServletContext servletContext=ServletActionContext.getServletContext(); request.getSession(); HttpServletResponse response=ServletActionContext.getRequest(); return "scope"; }

方法二：实现指定接口，由struts2框架运行时注入：
public class HelloWorldAction implements ServletRequestAware,ServletResponseAware, ServletContextAware{ private HttpServletRequest request; private HttpServletResponse response; private HttpServletContext context; public void setServletRequest(HttpServletRequest req){ this.request=req } public void setServletResponse(HttpServletResponse res){ this.request=res } public void setServletContext(HttpServletContext con){ this.request=con } }