messagesource读取properties

xml中配置：

<bean id="messageSource"
class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
<property name="basenames">
<array>
<value>classpath:web</value>
</array>
</property>
</bean>

@Resource
private MessageSource messageSource;

String username = messageSource.getMessage("username", new Object[]{}, LocaleContextHolder.getLocale());