struts2獲取servlet的api

public class Demo1Action extends ActionSupport {
public String execute(){
ServletContext application = ServletActionContext.getServletContext();
HttpServletRequest request = ServletActionContext.getRequest();
HttpServletResponse response = ServletActionContext.getResponse(); HttpSession session = request.getSession();
System.out.println(application);
System.out.println(session);
System.out.println(request);
System.out.println(response);
return SUCCESS;
}
}