struts2 如何获取request,session,response

import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ActionSupport;public class NonIoCServlet extends ActionSupport {private static final long serialVersionUID = 1L;private String message;        public String getMessage() {        return message;            }        @Override    public String execute() {            ActionContext.getContext().getSession().put("msg", "Hello World from Session!");                HttpServletRequest request = ServletActionContext.getRequest();        HttpServletResponse response = ServletActionContext.getResponse();                HttpSession session = request.getSession();                HttpServletRequest request2 = (HttpServletRequest)ActionContext.getContext().get(ServletActionContext.HTTP_REQUEST );         Map session2 =(Map)ActionContext.getContext().get(ActionContext.SESSION);                StringBuffer sb =new StringBuffer("Message from request: ");        sb.append(request.getParameter("msg"));        sb.append("<br>Response Buffer Size: ");        sb.append(response.getBufferSize());        sb.append("<br>Session ID: ");        sb.append(session.getId());                message = sb.toString();        return SUCCESS;    }}

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package qy.test.action;import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import org.apache.struts2.interceptor.ServletRequestAware;import org.apache.struts2.interceptor.ServletResponseAware;import org.apache.struts2.interceptor.SessionAware;import com.opensymphony.xwork2.ActionSupport;public class IoCServlet extends ActionSupport implements SessionAware,ServletRequestAware, ServletResponseAware {private static final long serialVersionUID = 1L;private String message;private Map session;private HttpServletRequest request;private HttpServletResponse response;public String getMessage() {return message;}public void setSession(Map session) {this.session = session;}public void setServletRequest(HttpServletRequest request) {this.request = request;}public void setServletResponse(HttpServletResponse response) {this.response = response;}@Overridepublic String execute() {session.put("msg", "Hello World from Session!");HttpSession session = request.getSession();StringBuffer sb = new StringBuffer("Message from request: ");sb.append(request.getParameter("msg"));sb.append("<br>Response Buffer Size: ");sb.append(response.getBufferSize());sb.append("<br>Session ID: ");sb.append(session.getId());message = sb.toString();return SUCCESS;}}