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1. A Performer API:

Package springAction

Public interface Performer {

Void perform ()

}

2. A Juggler class implements the Performer interface:

Package springAction

Public class Juggler implements Performer {

Private int beanBags = 3

Public Juggler () {

}

Public Juggler (int beanBags) {

This.beanBags = beanBags

}

Public void perform () {

System.out.println ("Juggling" + beanBags + "beanbags")

}

}

3. A PoeticJuggler class inherits the Juggler class:

Package springAction

Public class PoeticJuggler extends Juggler {

Private Poem poem

Public PoeticJuggler (Poem poem) {

Super ()

This.poem = poem

}

Public PoeticJuggler (int beanBags, Poem poem) {

Super (beanBags)

This.poem = poem

}

Public void perform () {

Super.perform ()

System.out.println ("PoeticJugger reciting...")

Poem.recite ()

}

}

4. A Poem API:

Package springAction

Public interface Poem {

Void recite ()

}

5. A singleton class Stage:

Package springAction

Public class Stage {

Private Stage () {

}

Private static class StageSingletonHolder {

Static Stage instance = new Stage ()

}

Public static Stage getInstance () {

Return StageSingletonHolder.instance

}

}

6. See how to write the xml file (springAction.xml):

Add a main function to run it to see the effect:

Package springAction

Import org.springframework.context.ApplicationContext

Import org.springframework.context.support.ClassPathXmlApplicationContext

Public class springActionMain {

Public static void main (String [] args) {

/ / TODO Auto-generated method stub

ApplicationContext ctx = new ClassPathXmlApplicationContext (

"springAction/springAction.xml")

Try {

Performer performer = (Performer) ctx.getBean ("duke")

Performer.perform ()

Performer = (Performer) ctx.getBean ("poeticDuke")

Performer.perform ()

} catch (Exception e) {

E.printStackTrace ()

} finally {

(ClassPathXmlApplicationContext) ctx) .close ()

}

}

}

7. Scope of bean

All Spring Bean is singleton by default, and when the container allocates a Bean, it always returns the same instance. However, spring is flexible, and when singleton mode is not required, it can be configured as follows:

8. Initialize Bean and destroy Bean

When the Spring container instantiates a Bean, it may need to do some initialization work, and when the Spring destroys a Bean, it may need to do some cleaning work. Spring supports Bean to provide custom methods for initialization and destruction.

9. Inject attributes for Bean

In general, java Bean will have some private properties and some set and get methods. Spring can use the set method to inject values for private properties of bean.

Example:

Package springAction

Public class Instrumentalist implements Performer {

Private String song

Private Instrument instrument

Private int age

Public Instrumentalist () {

}

Public void perform () {

System.out.println ("age =" + age)

System.out.println ("Playing" + song)

Instrument.play ()

}

Public String getSong () {

Return song

}

Public void setSong (String song) {

This.song = song

}

Public Instrument getInstrument () {

Return instrument

}

Public void setInstrument (Instrument instrument) {

This.instrument = instrument

}

Public int getAge () {

Return age

}

Public void setAge (int age) {

This.age = age

}

}

Xml file configuration:

Thank you for reading! This is the end of this article on "sample Analysis of xml configuration in Spring". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!

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