Spring进阶学习一

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Spring配置多个属性值，或者spring装配list、array、set、map等方式时可以使用如下方式，比如，这里有个人会演奏很多的乐器，那么需要有乐器Instrument这个接口，然后定义具体的乐器去实现这个乐器接口，还有一个表演者Performer这个接口，因为不只是只有这一个表演者可能。下面具体讲解

（1）建立表演者接口Performer

package com.springaction.P30;public interface Performer {void perform() ;}

（2）建立Instrument这个接口

package com.springaction.P40;public interface Instrument {public void play();}

（3）建立OneManHand（一个多才多艺的表演者）这个类，该类要实现Performer，并且内部维护了乐器Instrument这个对象，一般内部定义个全局属性，都会有相应的set方法，以便xml文件中进行IOC

package com.springaction.P46;import java.util.Collection;import java.util.Map;import com.springaction.P30.Performer;import com.springaction.P40.Instrument;public class OneManBand implements Performer{//对list进行测试 /*private Collection<Instrument> instruments;public void setInstruments(Collection<Instrument> instruments) {this.instruments = instruments;}@Overridepublic void perform() {for(Instrument instrument:instruments) {instrument.play();}}*/private Map<String,Instrument> instruments;public void setInstruments(Map<String,Instrument> instruments) {this.instruments = instruments;}@Overridepublic void perform() {for(String key:instruments.keySet()) {System.out.println(key+" :");Instrument instrument = instruments.get(key);instrument.play();}}}

（4）编辑Spring的xml文件，将上面的类OneManHand注入到bean中

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"       xsi:schemaLocation="http://www.springframework.org/schema/beans           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"><bean id="sonnet29" class="com.springaction.P34.Sonnet29"></bean><bean id="duck" class="com.springaction.P30.PoeticJuggler">    <constructor-arg value="15"></constructor-arg>    <constructor-arg ref="sonnet29"></constructor-arg>    <!--     <constructor-arg value="小名"></constructor-arg>--></bean><bean id="kenny" class="com.springaction.P40.Instrumentalist">    <property name="song" value="我爱你中国"></property>    <property name="instrument" ref="saxophone"></property></bean><bean id="saxophone" class="com.springaction.P40.Saxophone"></bean><!-- List测试代码部分<bean id="hank" class="com.springaction.P46.OneManBand">    <property name="instruments">        <list>            <ref bean="guitar"/>            <ref bean="cymbal"/>            <ref bean="hormonica"/>        </list>    </property></bean>--><bean id="hank" class="com.springaction.P46.OneManBand">    <property name="instruments">        <map>            <entry key="GUITAR" value-ref="saxophone"></entry>            <entry key="CYMBAL" value-ref="saxophone"></entry>            <entry key="HARMONICA" value-ref="saxophone"></entry>        </map>    </property></bean></beans>

（5）测试代码部分

package com.springaction.P30;import org.junit.Test;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;public class PerformerTest {@Testpublic void testPerform() {ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");Performer performer = (Performer)ctx.getBean("duck");Performer performer2 = (Performer)ctx.getBean("hank");performer.perform();performer2.perform();}}

（6）结果展示：

GUITAR :Ding Ding DingCYMBAL :Ding Ding DingHARMONICA :Ding Ding Ding

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