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Spring中為了減少xml中配置，可以聲明一個配置類（例如SpringConfig）來對bean進行配置。
一、首先，需要xml中進行少量的配置來啟動Java配置:
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- <?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、定義一個配置類
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用@Configuration注解該類，等價 與XML中配置beans；用@Bean標注方法等價于XML中配置bean。
代碼如下：
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- 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、基礎類代碼
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Counter：
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- 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類
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- 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、調用測試類
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- 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");//?讀取bean.xml中的內容??
- ????????ApplicationContext?annotationContext?=?new?AnnotationConfigApplicationContext("SpringStudy");??
- ????????Counter?c?=?annotationContext.getBean("counter",?Counter.class);//?創建bean的引用對象??
- ????????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的話，或者使用自動掃描調用的話，代碼為
ApplicationContext ctx = new ClassPathXmlApplicationContext("spring/bean.xml");// 讀取bean.xml中的內容
Counter c = ctx.getBean("counter", Counter.class);// 創建bean的引用對象
五、運行結果
12.0
false
Shake it Off
Piano
?
?
見： http://blog.csdn.net/vvhesj/article/details/47661001
)