Spring中基于Java的配置@Configuration和@Bean用法详解

2023-08-21 01:11:04 54

一、首先，需要xml中进行少量的配置来启动Java配置:

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：

packageSpringStudy;
importorg.springframework.context.annotation.Bean;
importorg.springframework.context.annotation.Configuration;
importSpringStudy.Model.Counter;
importSpringStudy.Model.Piano;
@Configuration
publicclassSpringConfig{
@Bean
publicPianopiano(){
returnnewPiano();
}
@Bean(name="counter")
publicCountercounter(){
returnnewCounter(12,"ShakeitOff",piano());
}
}

三、基础类代码

Counter：

packageSpringStudy.Model;
publicclassCounter{
publicCounter(){
}
publicCounter(doublemultiplier,Stringsong,Instrumentinstrument){
this.multiplier=multiplier;
this.song=song;
this.instrument=instrument;
}
privatedoublemultiplier;
privateStringsong;
@Resource
privateInstrumentinstrument;
publicdoublegetMultiplier(){
returnmultiplier;
}
publicvoidsetMultiplier(doublemultiplier){
this.multiplier=multiplier;
}
publicStringgetSong(){
returnsong;
}
publicvoidsetSong(Stringsong){
this.song=song;
}
publicInstrumentgetInstrument(){
returninstrument;
}
publicvoidsetInstrument(Instrumentinstrument){
this.instrument=instrument;
}
}

Piano类

packageSpringStudy.Model;
publicclassPiano{
privateStringname="Piano";
privateStringsound;
publicStringgetName(){
returnname;
}
publicvoidsetName(Stringname){
this.name=name;
}
publicStringgetSound(){
returnsound;
}
publicvoidsetSound(Stringsound){
this.sound=sound;
}
}

四、调用测试类

packagewebMyBatis;
importorg.springframework.context.ApplicationContext;
importorg.springframework.context.annotation.AnnotationConfigApplicationContext;
importSpringStudy.Model.Counter;
publicclassSpringTest{
publicstaticvoidmain(String[]args){
//ApplicationContextctx=newClassPathXmlApplicationContext("spring/bean.xml");//读取bean.xml中的内容
ApplicationContextannotationContext=newAnnotationConfigApplicationContext("SpringStudy");
Counterc=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

ApplicationContextctx=newClassPathXmlApplicationContext("spring/bean.xml");//读取bean.xml中的内容
Counterc=ctx.getBean("counter",Counter.class);//创建bean的引用对象

五、运行结果

12.0
false
ShakeitOff
Piano
---------------------

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。

Spring中基于Java的配置@Configuration和@Bean用法详解

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