Spring注入后Action接收不到！该如何解决

package com.news.app.user;import java.sql.SQLException;import com.sun.dao.FirstTypeDAOImpl;import sun.common.SunActionSupport;public class UserAction extends SunActionSupport{    private UserService userService;    private FirstTypeDAOImpl firsttypeDAO;            public FirstTypeDAOImpl getFirsttypeDAO() {        return firsttypeDAO;    }    public void setFirsttypeDAO(FirstTypeDAOImpl firsttypeDAO) {        this.firsttypeDAO = firsttypeDAO;    }    public UserService getUserService() {        return userService;    }    public void setUserService(UserService userService) {        this.userService = userService;    }    @Override    public String add() throws Exception {        // TODO Auto-generated method stub        return null;    }    @Override    public String addView() throws Exception {        // TODO Auto-generated method stub        return null;    }    @Override    public String delete() throws Exception {        // TODO Auto-generated method stub        return null;    }    @Override    public String edit() throws Exception {        // TODO Auto-generated method stub        return null;    }    @Override    public String editView() throws Exception {        // TODO Auto-generated method stub        return null;    }    @Override    public String list() throws Exception {        // TODO Auto-generated method stub        return null;    }        //登录LoginAction    public String Login() throws SQLException{        System.out.println(userService+"\n"+firsttypeDAO);//        if(condition=="login"){//            System.out.println(user.getUser_name());////            getSession().put("user_name", user.getUser_name());////            getSession().put("password", user.getPassword());////            getSession().put("user_lvl", user.getUser_lvl());//            System.out.println("登录成功");//            return LOGIN;//        }//        else{//            System.out.println("登录失败");//            return ERROR;//        }        return "login";            }    @Override    public String search() throws Exception {        // TODO Auto-generated method stub        return null;    }}

package com.news.app.user;import java.sql.SQLException;import sun.common.ServiceDAO;import sun.common.newsService;import com.sun.dao.UserDAO;import com.sun.vo.UserExample;public class UserService implements newsService{    private ServiceDAO userService;    private String password;    private int user_lvl;    private String user_name;        public int getUser_lvl() {        return user_lvl;    }    public void setUser_lvl(int userLvl) {        user_lvl = userLvl;    }    public String getPassword() {        return password;    }    public String getUser_name() {        return user_name;    }    public void setPassword(String password) {        this.password = password;    }    public void setUser_name(String userName) {        user_name = userName;    }    public ServiceDAO getUserService() {        return userService;    }    public void setUserService(ServiceDAO userService) {        System.out.println(this);        this.userService = userService;    }    public String addService() throws SQLException {        // TODO Auto-generated method stub                UserExample example = new UserExample();        com.sun.vo.UserExample.Criteria criteria = example.createCriteria();        criteria.andPasswordEqualTo(password).andUserNameEqualTo(user_name);        //判断是否有此人        if(!userService.getUserDAO().selectByExample(example).isEmpty()){            //用户信息及等级存入session                        user_lvl=userService.getUserDAO().selectByExample(example).get(0).getUserLvl();                        return "login";            }        return "error";    }    public String addViewService() throws SQLException {        // TODO Auto-generated method stub        return null;    }    public String deleteService() throws SQLException {        // TODO Auto-generated method stub        return null;    }    public String editService() throws SQLException {        // TODO Auto-generated method stub        return null;    }    public String editViewService() throws SQLException {        // TODO Auto-generated method stub        return null;    }    public String listService() throws SQLException {        // TODO Auto-generated method stub        return null;    }    public String searchService() throws SQLException {        // TODO Auto-generated method stub        return null;    }    }