9.Action类接收参数(原生的ServletAPI )

public class ContextAction extends ActionSupport {

public String test(){

//获取request对象
HttpServletRequest request=ServletActionContext.getRequest();
request.setAttribute("username", "username_request");

//获取response对象
HttpServletResponse response=ServletActionContext.getResponse();

//获取session对象
Map<String,Object> session=ServletActionContext.getContext().getSession();
session.put("username", "username_session");

//获取ServletContext对象
ServletContext sc=ServletActionContext.getServletContext();
sc.setAttribute("username", "username_application");

return "text";
}

}