I still don't get how to avoid the use of getBean() - spring

Question

I'm new to Spring and I've read many guides on how to inject beans. Curiously, in every example I see, they use getBean in a class main method (not what I need). Also I've read many forums and questions related to how not to use getBean but I still can't figure out the best approach for my app.
I'm refactoring a web app that is highly coupled and without design patterns. Every business class has a corresponding DAO class, every DAO class extends a super DAO which handles the connection and other stuff. The problem here is that every DAO needs, in the constructor, some database config parameters that are being passed from the business class. What I'm trying to do is to put these parameters in a DBConfig bean and inject them into every DAO allowing me to create the DAO object from every business class simply, for example: dao = new myDAO().
How can I inject the DBConfig bean into every DAO "automatically"? Should I use getBean in the super DAO?

Answer 1

Your config could look like this:
<bean id="daoConfig1" class="com.foo.dao.DAOConfig">
<property name="dbUrl" value="jdbc://urlForDao1" />
...
</bean>
<bean id="dao1" class="com.foo.dao.DAO1">
<constructor-arg ref="daoConfig1" />
</bean>
<bean id="business1" class="com.foo.service.Business1">
<property name="dao" ref="dao1" />
</bean>
<bean id="daoConfig2" class="com.foo.dao.DAOConfig">
<property name="dbUrl" value="jdbc://urlForDao2" />
...
</bean>
<bean id="dao2" class="com.foo.dao.DAO2">
<constructor-arg ref="daoConfig2" />
</bean>
<bean id="business2" class="com.foo.service.Business2">
<property name="dao" ref="dao2" />
</bean>
Or share a single daoConfig instance between all daoX beans, if that's what you want.
You can then use the folowing to handle the business logic:
ApplicationContext context = new ClassPathXmlApplicationContext(new String[] {"beans.xml"});
Business1 b1 = (Business1) context.getBean("business1");
b1.doStuff();
Or better still, use something like Spring MVC that can wire the business beans into your controllers without needing to call getBean().