Related to this question, I'm leveraging Spring's use of the @Resource
annotation to the private member variable (no setter needed), thus fully
relying on Spring's injection mechanism. I supposed it all depends on
tight coupling to Spring you want to add.
Relph,Brian wrote:
The actions are auto-wired by name by default - so if any of its properties
match bean-ids in your spring config, and they have setters, then those
properties will get set.
The part about declaring the dependencies means you disable the auto-wiring,
and declare your actions as spring beans. So, instead of this:
<action name="index"
class="com.actions.IndexAction">
<result>/WEB-INF/view/index.jsp</result>
</action>
You would do this:
<action name="index"
class="index-action-id">
<result>/WEB-INF/view/index.jsp</result>
</action>
Along with additional spring config:
<bean id="index-action-id"
class="com.actions.IndexAction">
<property name="myDao" ref="myDao-id" />
<property name="myMailSender" ref="myMailSender-id" />
</bean>
Notice this does not actually disable auto-wiring (you would have to set the
auto-wire attribute in the spring config, either globally or per-bean), but it
does declaratively state what to set on the action as properties.
Brian Relph
-----Original Message-----
From: Asleson, Ryan [mailto:[EMAIL PROTECTED]
Sent: Thursday, May 08, 2008 8:29 AM
To: Struts Users Mailing List
Subject: Injecting Spring Services into Struts 2 Actions
Hello,
I found this guide to injecting Spring beans into Struts 2 Actions:
http://cwiki.apache.org/WW/spring.html
According to the red box at the bottom of the document, the Struts 2 Action does not need to be registered with Spring. So far so good.
However, I'm a little unclear as to how exactly it "knows" what Spring beans to inject into the Struts 2 Action. Assuming I have a Struts 2 Action that depends on a PersonService, I assume that the Struts 2 Action would have a public mutator for the PersonService like this:
public void setPersonService(PersonService service) {
this.personService = service;
}
How does the injection system "know" that this method should be used for injecting a Spring bean? Imagine that the Struts 2 Action has several "set" methods, and that there are a number of configured Spring beans.
It would take way too long for the injection system to look through every "set"
method on the Action and try to find a matching Spring bean, especially if there are a
lot of Spring beans (and there usually are).
The document above includes this comment:
We strongly recommend that you find declarative ways of letting Spring know what to provide for your actions.
But it doesn't give an example of how to let Spring know what to provide to the actions.
So, the question is: How do I tell Spring what beans need to be injected into the Action?
Thanks!!!!
-Ryan
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