action：
public String scope() throws Exception{
ActionContext ctx = ActionContext.getContext();
ctx.getApplication().put("app", "應用範圍");//往ServletContext裡放入app
ctx.getSession().put("ses", "session範圍");//往session裡放入ses
ctx.put("req", "request範圍");//往request裡放入req
return "scope";
}
jsp：
<body>
${applicationScope.app} <br>
${sessionScope.ses}<br>
${requestScope.req}<br>
</body>
擷取HttpServletRequest / HttpSession / ServletContext / HttpServletResponse對象
方法一，通過ServletActionContext.類直接擷取：
public String rsa() throws Exception{
HttpServletRequest request = ServletActionContext.getRequest();
ServletContext servletContext = ServletActionContext.getServletContext();
request.getSession()
HttpServletResponse response = ServletActionContext.getResponse();
return "scope";
} 方法二，實現指定介面，由struts架構運行時注入：
public class HelloWorldAction implements ServletRequestAware, ServletResponseAware, ServletContextAware{
private HttpServletRequest request;
private ServletContext servletContext;
private HttpServletResponse response;
public void setServletRequest(HttpServletRequest req) {
this.request=req;
}
public void setServletResponse(HttpServletResponse res) {
this.response=res;
}
public void setServletContext(ServletContext ser) {
this.servletContext=ser;
}
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