ActionContext 获取 域引用的map
ServletActionContext获取具体域对象
//域范围
ActionContext ac = ActionContext.getContext(); Map<String,Object> applicationMap = ac.getApplication();//这个就是ServletContext对象中维护的那个Map applicationMap.put("p", "application_p");// ServletContext.setAttribute(key,object); Map<String,Object> sessionMap = ac.getSession();//这个就是HttpSession对象中维护的那个Map sessionMap.put("p", "session_p");// HttpSession.setAttribute(key,object); ac.put("p", "request_p");//相当于ServletRequest.setAttribute(key,obj);
1 //获取Servlet中的常用对象的引用 2 3 //ServletContextAware接口 4 5 public class WebObjectAction extends ActionSupport implements Serializable,ServletContextAware,ServletRequestAware,ServletResponseAware { 6 private ServletContext context; 7 private HttpServletRequest request; 8 private HttpServletResponse response; 9 //方式一 10 public String execute1(){ 11 ServletContext sc = ServletActionContext.getServletContext(); 12 System.out.println(sc); 13 ServletRequest request = ServletActionContext.getRequest(); 14 System.out.println(request); 15 return SUCCESS; 16 } 17 //方式二 18 public String execute2(){ 19 System.out.println(context); 20 System.out.println(request); 21 System.out.println(response); 22 return SUCCESS; 23 } 24 public void setServletContext(ServletContext context) {//如果动作类实现了ServletContextAware接口,就会自动调用该方法 25 this.context = context; 26 } 27 public void setServletRequest(HttpServletRequest request) { 28 this.request = request; 29 } 30 public void setServletResponse(HttpServletResponse response) { 31 this.response = response; 32 } 33 34 35 36 }