springMVC表单提交无法从后台获取

就是简单的form表单提交，

<form action="regist.do" method="post">

账号：<input type="text" name="username"/><br/>
<br/>
密码：<input type="password" name="password" />
<input type="submit" value="登陆"/>
</form>

后台获取的一直未null值

@RequestMapping("regist")
public ModelAndView regist(HttpServletRequest request, String name1){
String name = request.getParameter("username");
String pass = request.getParameter("password") ;
//    request.setAttribute("username", user.getUsername());
//    request.setAttribute("password", user.getPassword());
System.out.println(name1);
System.out.println(pass);     
return new ModelAndView("index");

}

求解答我这个菜鸟的疑惑，