What are the Java-based @ Configuration and @ Bean uses in Spring

This article focuses on "what is the use of @ Configuration and @ Bean based on Java in Spring". Interested friends may wish to have a look at it. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn "what are the Java-based @ Configuration and @ Bean uses in Spring?"

First, a small amount of configuration in xml is required to start the Java configuration:

Define a configuration class

Annotating this class with @ Configuration is equivalent to configuring beans; in XML with @ Bean annotation and configuring bean in XML.

The code is as follows:

Package SpringStudy;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import SpringStudy.Model.Counter;import SpringStudy.Model.Piano;@Configurationpublic class SpringConfig {@ Beanpublic Piano piano () {return new Piano ();} @ Bean (name = "counter") public Counter counter () {return new Counter (12, "Shake it Off", piano ();}}

Third, basic class code

Counter:

Package SpringStudy.Model;public class Counter {public Counter () {} public Counter (double multiplier, String song,Instrument instrument) {this.multiplier = multiplier;this.song = song;this.instrument=instrument;} private double multiplier;private String song;@Resourceprivate Instrument instrument;public double getMultiplier () {return multiplier;} public void setMultiplier (double multiplier) {this.multiplier = multiplier;} 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;}}

Piano class

Package SpringStudy.Model;public class Piano {private String name= "Piano"; private String sound;public String getName () {return name;} public void setName (String name) {this.name = name;} public String getSound () {return sound;} public void setSound (String sound) {this.sound = sound;}}

Fourth, call the test class

Package webMyBatis;import org.springframework.context.ApplicationContext;import org.springframework.context.annotation.AnnotationConfigApplicationContext;import SpringStudy.Model.Counter;public class SpringTest {public static void main (String [] args) {/ / ApplicationContext ctx = new ClassPathXmlApplicationContext ("spring/bean.xml"); / / read the contents of bean.xml ApplicationContext annotationContext = new AnnotationConfigApplicationContext ("SpringStudy"); Counter c = annotationContext.getBean ("counter", Counter.class); / / create bean's reference object System.out.println (c.getMultiplier ()) System.out.println (c.isEquals ()); System.out.println (c.getSong ()); System.out.println (c.getInstrument (). GetName ());}}

Note: if you configure beans and bean in xml, or if you use automatic scan calls, the code is

ApplicationContext ctx = new ClassPathXmlApplicationContext ("spring/bean.xml"); / / read the contents of bean.xml Counter c = ctx.getBean ("counter", Counter.class); / / create a reference object for bean

5. Operation results

12.0falseShake it OffPiano-

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