如何将Spring bean ID注入另一个Spring Configured Bean？

Question

I want to be able to pass a bean ID into another bean by reference. So if I have this:

<bean id="specialName" class="my.SpecialBean"/>
<bean id="referenceBean" class="my.ReferenceBean">
    <property name="refId" value="<specialName.name>"/>
</bean>

---

public class ReferenceBean {

    // The spring injected value of this should be 'specialName'        
    public String refId;

    // getter & setter for refId
}

The reason I need this, it that ReferenceBean is actually a route builder in Camel and it directs messages to SpecialBean through the Spring Registry. I'm new to Spring and Camel, so if this is an ill conceived questions, my apologies.

Answer 1

You can use Spring-EL -

<bean id="specialName" class="my.SpecialBean"/>
<bean id="referenceBean" class="my.ReferenceBean">
    <property name="refId" value="#{specialName.name}"/>
</bean>

Answer 2

Why not just put the id statically into refId there? It will not change later so why should you do something complicated here?

<bean id="specialName" class="my.SpecialBean"/>
<bean id="referenceBean" class="my.ReferenceBean">
    <property name="refId" value="specialName"/>
</bean>

Answer 3

What about:

<bean id="specialName" class="my.SpecialBean" />
<bean id="referenceBean" class="my.ReferenceBean">
    <property name="refId" ref="specialName" />
</bean>

This way your bean should be injected (provided you change the String attribute in my.SpecialBean.

Then you can get any attribute you want.

Answer 4

You could use the idref element (see Spring XML Beans Schema ):

<bean id="specialName" class="my.SpecialBean"/>
<bean id="referenceBean" class="my.ReferenceBean">
    <property name="refId">
        <idref bean="specialName"/>
    </property>
</bean>