CODEWITHSUNDEEP
javaspring
JSBach
JSBach

Reputation: 4747

How to reference a bean's property inside servlet-context?

I am new to Java and I am working on a Spring MVC project. we have a servlet-context where we store information we are going to need at runtime. I have a set of URLs that are important on my system and they are all based on a base URL that is also defined on the servlet context, like this:

<bean id="applicationConfiguration"
        class="example.ApplicationConfig">
        <property name="baseUrl" value="http://localhost:8080/"></property>
    </bean>

Now, I have a second bean in which I would like to reference the baseUrl:

   <bean id="menu"
            class="example.Menu">
            <property name="entry1name" value="entry1"></property>
            <property name="entry1value" value="<baseUrl>"></property>
            <property name="entry2name" value="entry2"></property>
            <property name="entry2value" value="<baseUrl>/page2"></property>
        </bean>

The second bean is a little bit simpler than the real one, to focus on the problem.

I would like to reference the baseUrl property, so I am searching and trying things like

${applicationConfiguration.baseUrl}

@applicationConfiguration.baseUrl

using 

<property name="entry1value" ref="applicationConfiguration.baseUrl"></property>

and so on.

The first two are used as string, not "resolved". The second one does not work because .baseUrl is not a bean.

Is there any way that I can reference the property to use it as a value?

Upvotes: 1

Views: 548

Answers (1)

Jigar Joshi
Jigar Joshi

Reputation: 240870

You would have to define baseUrl as another bean in that case

<bean id="baseUrl" class="java.lang.String">
  <constructor-arg value="http://localhost:8080/"/>
</bean>

and then use it reference

for example

<property name="baseUrl" ref="baseUrl/">

in your particular example it is more suitable to use PropertyPlaceholderConfigurer instead of defining separate bean per property

<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">

    <property name="location">
        <value>yourApp.properties</value>
    </property>
</bean>

and then refer properties directly in application context by property key name for example

<property name="baseurl" value="${baseurl}" />

provided that your yourApp.properties is placed on root of classpath and it has a following property

baseurl=somevalue

Upvotes: 1

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