Spring Properties File

Question

I am using this in my application config to specify where to get my messages

<bean id="messageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
    <property name="basenames" value="WEB-INF/properties/messages"/>
 <property name="defaultEncoding" value="UTF-8"/>
</bean>

How do i declare a bean same like this which can be accessible to my java class codes

Answer 1

You can use this one, instead of creating your own, via:

@Resource(name="messageSource")
private MessageSource messageSource;

Answer 2

Your declaration of the messageSource bean is correct as long as your messages are in WEB-INF/properties/messages in the form of key value pairs.

Now, let's say you want to inject the messageSource in a class called ClassA and you have a setter for it (setMessageSource). All you have to do is have the spring container manage that class as one of it's bean. That means you declare the class as a bean in your applicationContext.xml like so:

<!-- I am not setting the scope of this object as I don't know what it should be. You should do that based on your needs -->
<bean id="classA" class="com.somepath.ClassA">
</bean>

thats it! when the spring container initializes this class it will recognize that it has a field called messageSource of type ReloadableResourceBundleMessageSource and inject the messageSource in the instance of your class.

Answer 3

Like @Bozho said after you declare MessageSource Spring will automatically detect the type and inject the properties file it finds at "WEB-INF/properties/messages[.properties]" that you just set up in your context, then you can use it like this messageSource.getMessage("name"[,...]) or you can go the old-fashion way and your bean can implement MessageSourceAware and then you would need to include a public setter for messageSource -- you wouldn't need to explicitly inject the messageSource in this case either Spring would recognize the interface implemented and do the injection automatically for you.