Struts2的Action中如何操作作用域对象

package com.cy.action;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;
import org.apache.struts2.util.ServletContextAware;

import com.opensymphony.xwork2.ActionSupport;

public class BaseAction extends ActionSupport implements ServletRequestAware,ServletResponseAware,ServletContextAware {

private static final long serialVersionUID = 1L;
private ServletContext servletContext;
private HttpServletRequest request;
private HttpServletResponse response;

@Override
public void setServletContext(ServletContext arg0) {
// TODO Auto-generated method stub
this.servletContext=arg0;

}

@Override
public void setServletResponse(HttpServletResponse arg0) {
// TODO Auto-generated method stub
this.response=arg0;

}

@Override
public void setServletRequest(HttpServletRequest arg0) {
// TODO Auto-generated method stub
this.request=arg0;
}

public HttpServletRequest getRequest() {
return request;
}

public void setRequest(HttpServletRequest request) {
this.request = request;
}

public HttpServletResponse getResponse() {
return response;
}

public void setResponse(HttpServletResponse response) {
this.response = response;
}

public ServletContext getServletContext() {
return servletContext;
}

}

//--------------Struts2 操作作用域的3种方式-------------------
//        //采用实现接口的方式，来获取作用域（最常用）
//        getRequest().setAttribute(arg0, arg1)
//        getRequest().getSession().setAttribute(arg0, arg1)
//        getServletContext().setAttribute(arg0, arg1)
//

//        //采用ActionContext对象来对作用域进行操作
//        ActionContext ac = ActionContext.getContext();
//        ac.put(key, value);//直接对request进行操作。
//        ac.getSession().put(key, value)//向Session中设值
//        ac.getApplication().put(key, value)//向ServletContext中设值

//        //采用ServletActionContext对象来对作用域进行操作
//        HttpServletRequest request = ServletActionContext.getRequest();
//        HttpServletResponse response = ServletActionContext.getResponse();
//        ServletContext sevletContext = ServletActionContext.getServletContext();
//