配置文件加了这句之后一直404 无法访问：
<mvc:annotation-driven validator="validator" />
加下面这些不会报错
<bean id="messageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
<property name="defaultEncoding" value="UTF-8" />
<property name="useCodeAsDefaultMessage" value="true" />
<property name="cacheSeconds" value="10"></property>
<property name="basenames">
<list>
<value>classpath:messages</value>
</list>
</property>
</bean>
<bean id="validator"
class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean">
<property name="providerClass" value="org.hibernate.validator.HibernateValidator"/>
<!-- 如果不加默认到 使用classpath下的 ValidationMessages.properties -->
<property name="validationMessageSource" ref="messageSource"/>
</bean>
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<bean class="org.springframework.http.converter.ByteArrayHttpMessageConverter"/>
<bean id="jsonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" >
<property name = "supportedMediaTypes">
<list>
<value>text/plain;charset=UTF-8</value>
</list>
</property>
</bean>
</list>
</property>
</bean>