hibernate validator配置国际化支持时直接输出键值

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       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-4.1.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd">

    <mvc:interceptors>
        <bean id="localeChangeInterceptor" class="org.springframework.web.servlet.i18n.LocaleChangeInterceptor">
            <property name="paramName" value="lang"/>
        </bean>
    </mvc:interceptors>


    <bean id="localeResolver" class="org.springframework.web.servlet.i18n.CookieLocaleResolver">
        <property name="cookieMaxAge" value="604800"/>
        <property name="defaultLocale" value="zh_CN" />
        <property name="cookieName" value="language"></property>
    </bean>

    <bean id="messageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
        <property name="basenames">
            <list>
                <value>classpath:i18N/messages</value>
                <value>classpath:i18N/validation</value>
            </list>
        </property>
           <property name="defaultEncoding" value="UTF-8" />
        <property name="useCodeAsDefaultMessage" value="false"/>
    </bean>

    <mvc:annotation-driven validator="validator" />
    <bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean">
      <property name="providerClass" value="org.hibernate.validator.HibernateValidator"/>
      <property name="validationMessageSource" ref="messageSource"/>
    </bean>
</beans>

https://www.oschina.net/question/1243908_2146076