Spring中基于Java的配置@Configuration和@Bean用法
Spring中为了减少xml中配置，可以生命一个配置类（例如SpringConfig）来对bean进行配置。
一、首先，需要xml中进行少量的配置来启动Java配置:
[java] view plain copy print? <?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.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd http://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：
[java] view plain copy print? package SpringStudy; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import SpringStudy.Model.Counter; import SpringStudy.Model.Piano; @Configuration public class SpringConfig { @Bean public 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：
[java] view plain copy print? 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; @Resource private 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
[java] view plain copy print? 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
[java] view plain copy print? 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
本文转自http://blog.csdn.net/vvhesj/article/details/47661001感谢作者
转载于:https://www.cnblogs.com/panxuejun/p/6734478.html
