*Aware

1.ServletRequestAware:     就是request

            import org.apache.struts2.interceptor.ServletRequestAware;

            public class LoginAction extends ActionSupport implements ServletRequestAware {

                        private HttpServletRequest servletRequest;

                        public void setServletRequest(HttpServletRequest servletRequest) {
                               this.servletRequest=servletRequest;
                        }

              }

2.ApplicationAware:          就是application

3.CookiesAware:

4.ParameterAware:

5.PrincipalAware:

6.RequestAware:

7.SessionAware:            就是session

8.ServletResponseAware:       就是response

9ServletContextAware: