关于struts2的 action怎么写，请对照STRUTS1的对照说明一下那里跟那里是一样的。。。。然后我们老师是这么写的。。跟网上好多都不一样，不知道是什么意思，麻烦大哥们解释一下

package action;

import java.util.ArrayList;

import java.util.List;

import javax.servlet.https.HttpServletRequest;

import javax.servlet.https.HttpServletResponse;

import javax.servlet.https.HttpSession;

import org.apache.struts2.interceptor.ServletRequestAware;

import org.apache.struts2.interceptor.ServletResponseAware;

import biz.LoginBiz;

import dao.UserDao;

import entity.DepartmentInfo;

import entity.UserInfo;

public class LoginAction implements ServletRequestAware,

ServletResponseAware {

private HttpServletRequest request;

private HttpServletResponse response;

private LoginBiz loginbiz;

private UserInfo userinfo;

public void setRequest(HttpServletRequest request) {

this.request = request;

}

public void setResponse(HttpServletResponse response) {

this.response = response;

}

public void setLoginbiz(LoginBiz loginbiz) {

this.loginbiz = loginbiz;

}

public UserInfo getUserinfo() {

return userinfo;

}

public void setUserinfo(UserInfo userinfo) {

this.userinfo = userinfo;

}

public void setServletRequest(HttpServletRequest request) {

// TODO Auto-generated method stub

this.request=request;

}

public void setServletResponse(HttpServletResponse response) {

// TODO Auto-generated method stub

this.response=response;

}

//方法

//登录

public String selByName(){

H．ttpSession session=request.getSession();

UserInfo user=this.loginbiz.selByName(userinfo.getUserName(), userinfo.getUserPassword());

if(user==null){

request.setAttribute("msg", "<script>alert('用户名或密码错误');</script>");

return "login";

}

else{

session.setAttribute("user", user);

return "index";

}

}

}