Spring 基于Java的Bean聲明

Spring 基于Java的Bean聲明

使用@Configuration進行設置；

Xml：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans"xmlns:p="http://www.springframework.org/schema/p" xmlns:util="http://www.springframework.org/schema/util"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsdhttp://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.1.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd"><context:component-scan base-package="com.stono.sprtest"></context:component-scan>
</beans>

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JavaConfig：

package com.stono.sprtest;import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Scope;@Configuration
public class SingerConfig {@Bean@Scope("prototype")// 如果加了這個就會導致有兩個Cymbal對象；public InstrumentI cymbal() {return new Cymbal();}@Beanpublic Singer3 singer3() {// 參數里面的cymbal()不會新建Bean，還是之前那個單例實體；return new Singer3(cymbal(), "newstr");}
}

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AppBean：

package com.stono.sprtest;import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;public class AppBeans8 {@SuppressWarnings("resource")public static void main(String[] args) {ApplicationContext context = new ClassPathXmlApplicationContext("appbeans8.xml");Singer3 singer3 = (Singer3) context.getBean("singer3");System.out.println(singer3);Object bean = context.getBean("cymbal");System.out.println(bean);}
}

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POJO：

package com.stono.sprtest;import org.springframework.beans.factory.annotation.Autowired;public class Singer3 {@Autowiredprivate InstrumentI instrument;private String name;public Singer3(InstrumentI instrument, String name) {this.instrument = instrument;this.name = name;}@Overridepublic String toString() {return "Singer2 [instrument=" + instrument + ", name=" + name + "]";}
}

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package com.stono.sprtest;public class Cymbal implements InstrumentI {
}

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