Explain about spring container?
BeanFactory
:-
If we have two beanfactory containers it the application,
we con set one BeanFactory into another beanfactory to allow the beans in one
beanfactory to refer to the beans of other factory in this we can declare one
beanFactory as a parent and other as a child. This is similar to concept of
base class and derived classes derived class can access the properties of base
class but base classes cannot access the properties of derived class.
In order to refer to parent beans we can use
tag<ref parent=””/>
Apart from parent attribute it has local which
indicates refer to the local first if not found then search in parent factory
and perform injection.
ApplicationContext Container:-
It is an enhancement for
BeanFactory container . To activate ApplicationContext container we can create object fro the java class that
implements ApplictionContext interface. This is sub interface of
Beanfactory(I).
There are three important implementations classes for
ApplicationContext(I)
Thery are :-
a)
FileSystemXmlApplictionContext
b)
ClassPathXmlApplictionContext
c)
XmlWebApplictionContext
d)
AnnotatinConfigApplicationContext
Note :-
ApplicationContext container is originally of
spring context/spring JEE module.
ApplicationContext container can erform every
activity of BeanFacotry container but it also gives the following additional
features.
1.
Ability to work with multiple spring cfg flies
2.
Pre-Instantiation of singleton class
3.
Ability to working property files.
4.
Support to work with
18n(internationalization).
5.
Ability to work with event listeners
By activating BeanFactory
container fo one time we con’t make that container dealing multiple spring
configuration files but this activity is possible by using ApplicationContext
container.
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