spring3用@valid注解绑定验证时，BindingResult中显示不出错误

domain类：

package domain;

import javax.validation.constraints.NotNull; 
import javax.validation.constraints.Pattern; 
import javax.validation.constraints.Size; 


import org.hibernate.validator.constraints.Email; 
import org.hibernate.validator.constraints.NotEmpty; 
import org.springframework.format.annotation.DateTimeFormat; 
public class Register { 
static  int a=0; 
@NotEmpty 
@NotNull 
@Email(message="邮箱填写错误！") 
@Pattern(regexp="w{10,20}") 
private String e_mail; 
@Size(max=6,min=1,message="姓名错误！") 
@Pattern(regexp="S{1,30}") 
private String userName; 
@Pattern(regexp="[a-zA-z0-9]{6}" ,message="密码为6为字母或数字！") 
@NotEmpty(message="密码不能为空！") 
private String userPassword; 
public String getE_mail() { 
return e_mail; 
} 

public Register() { 
super(); 
// System.out.println(a++); 
} 


public Register(String e_mail, String userName, String userPassword) { 
super(); 
this.e_mail = e_mail; 
this.userName = userName; 
this.userPassword = userPassword; 
} 


public void setE_mail(String e_mail) { 
this.e_mail = e_mail; 
} 
public String getUserName() { 
return userName; 
} 
public void setUserName(String userName) { 
this.userName = userName; 
} 
public String getUserPassword() { 
return userPassword; 
} 
public void setUserPassword(String userPassword) { 
this.userPassword = userPassword; 
} 

} 

2.控制类：

package web;


import javax.validation.Valid;


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 domain.Register;


@Controller
@RequestMapping("/user")
public class UserController {
@ModelAttribute("user")
public Register getUser(){
Register register  = new Register("", "DD-AB-123", "45678979");
return register;
}
@RequestMapping(value="/register", method=RequestMethod.POST)
public String registerPost(@Valid @ModelAttribute("user")Register user,
BindingResult bindingResult){
// bindingResult.rejectValue("e_mail", "user.e_mail", "不能为空！");
System.out.println(bindingResult.getObjectName());
System.out.println(bindingResult.getErrorCount());
System.out.println(bindingResult.getFieldValue("e_mail"));
System.out.println(bindingResult.getFieldError("e_mail"));

if(bindingResult.hasErrors()){
return "register";
}else{

return "index";
}

}
@RequestMapping(value="/register", method=RequestMethod.GET)
public String register( ){
return "register";
}
}

3.mvc配置文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"  
 xmlns:context="http://www.springframework.org/schema/context"  
 xmlns:p="http://www.springframework.org/schema/p"  
 xmlns:mvc="http://www.springframework.org/schema/mvc"  
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
 xsi:schemaLocation="http://www.springframework.org/schema/beans  
      http://www.springframework.org/schema/beans/spring-beans-3.0.xsd  
      http://www.springframework.org/schema/context  
      http://www.springframework.org/schema/context/spring-context.xsd  
      http://www.springframework.org/schema/mvc  
      http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
     <!-- 注解扫描包 -->
<context:component-scan base-package="web" />
<!-- 开启注解 -->

<mvc:annotation-driven/>

<!-- <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping"></bean> -->
<!-- 静态资源访问 -->
<mvc:resources location="/img/" mapping="/img/**"/>  
<mvc:resources location="/js/" mapping="/js/**"/>   



<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
<!-- 上传文件设置 -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
 <property name="defaultEncoding" value="utf-8" />
     <property name="maxUploadSize" value="10485760000" />
     <property name="maxInMemorySize" value="40960" />
</bean>
 </beans>  

结果无论我在表单输入什么，都没错误显示