一、首先，需要xml中进行少量的配置来启动Java配置:
<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"xmlns:tx="http://www.springframework.org/schema/tx" xmlns:p="http://www.springframework.org/schema/p"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd"><context:component-scan base-package="SpringStudy.Model"></context:component-scan></beans>
二、定义一个配置类
用@Configuration注解该类，等价 与XML中配置beans；用@Bean标注方法等价于XML中配置bean。
代码如下：
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());}}
三、基础类代码
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类
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;}}
四、调用测试类
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");// 读取bean.xml中的内容ApplicationContext annotationContext = new AnnotationConfigApplicationContext("SpringStudy");Counter c = annotationContext.getBean("counter", Counter.class);// 创建bean的引用对象System.out.println(c.getMultiplier());System.out.println(c.isEquals());System.out.println(c.getSong());System.out.println(c.getInstrument().getName());}}
注意：如果是在xml中配置beans和bean的话，或者使用自动扫描调用的话，代码为
ApplicationContext ctx = new ClassPathXmlApplicationContext("spring/bean.xml");// 读取bean.xml中的内容Counter c = ctx.getBean("counter", Counter.class);// 创建bean的引用对象
五、运行结果
12.0falseShake it OffPiano---------------------
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本文标题: Spring中基于Java的配置@Configuration和@Bean用法详解
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