Re: Spring injection with java annotation?

From:
Owen Jacobson <angrybaldguy@gmail.com>
Newsgroups:
comp.lang.java.programmer
Date:
Thu, 24 Apr 2008 07:20:10 -0700 (PDT)
Message-ID:
<35e81eef-84b1-44da-b53c-9c7c6f17f7cf@s50g2000hsb.googlegroups.com>
On Apr 24, 8:46 am, Alberto Sfolcini <a.sfolc...@gmail.com> wrote:

Hi,

I am wondering if I can use an annotation to inject property and avoid
to write getters and setters for each property.

Let's suppose my spring's bean looks like:

<bean id="test" class="foo.bar.Test">
    <property name="debug" value="true"/>
    <property name="firstname" value="Bill" />
    <property name="lastname" value="Gates" />
</bean>

The Test class should look like:

public class Test{
   private boolean debug;
   private String firstname;
   private String lastname;

   // Setters and getters...

   public void setFirstname(String furstname) {
      this.firstname = firstname;
   }

  etc etc...

}

What I would like to obtain is to avoid the setters and getters
methods by using an annotation:

public class Test{
   @Inject(name="debug", optional="false")
   private boolean debug;
   @Inject
   private String firstname;
   @Inject
   private String lastname;

}

So, let's see the @Inject interface:

public @interface Inject {
        String name() default "";
        boolean optional() default false;

}

Now, what I am missing is the injection engine, that should be written
in a class that extends the ApplicationContext I guess.

Can somebody give some help?

thanks


@Autowired.

Spring supports most of the behaviour you want already, at least as of
2.5-series releases (and possibly 2.0-series releases).

Docs link: <http://static.springframework.org/spring/docs/2.5.x/
reference/beans.html#beans-annotation-config>

However, it will still use setFoo injection or constructor arguments -
you can't get away from that without rewriting part of Spring's actual
injection mechanism (which is well-buried). Furthermore, you don't
need to provide set/get pairs for properties you want injected: a set
method is enough. The only reason to add a get method is if you plan
on using the property elsewhere via its get method.

-o

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