spring3 mvc+mybatis+velocity+maven

package com.liaolitao.controller; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpSession; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.validation.BindingResult; import org.springframework.web.bind.annotation.ModelAttribute; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import com.liaolitao.form.User; import com.liaolitao.service.ServiceConstant; import com.liaolitao.service.UserService; @Controller public class LoginController implements ServiceConstant{ @Autowired private UserService userService; @RequestMapping("/") public String welcomeRedirect() { return "login"; } @RequestMapping(value = "login", method = RequestMethod.POST) public String login(@ModelAttribute("user") User user, HttpServletRequest request) { String userId = request.getParameter("userId").toString(); String passwd = request.getParameter("passwd").toString(); user.setUserId(userId); user.setPasswd(passwd); int loginStatus = userService.validLogin(userId, passwd); switch (loginStatus) { case LOGIN_SUCCESS: return "/index"; case LOGIN_UNEXIST_USER: return "redirect:/"; case LOGIN_WRONG_PASSWORD: return "redirect:/"; default: return "redirect:/"; } } }