<center ><font color="red" style="font-family:华文楷体;font-size:20px"><s:property value="#session.errorMES"/></font></center>
<c:remove var="errorMES" scope="session" />
//action中返回错误信息
if(user == null){
ValueStackUtil.setSessionAttribute("errorMES", "用户名不存在！");
return "error";
}else if(!u.getPassword().equals(user.getPassword())){
ValueStackUtil.setSessionAttribute("errorMES", "密码输入错误！");
return "error";
}
