Spring学习笔记_装配bean_02

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Spring的属性的注入包括单个properties的注入，list，set，map，properties集中类型。下面是代码示例。

1、list的属性注入

applicationContext的配置：

<?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"    xsi:schemaLocation="http://www.springframework.org/schema/beans      http://www.springframework.org/schema/beans/spring-beans.xsd     http://www.springframework.org/schema/aop            http://www.springframework.org/schema/aop/spring-aop-3.2.xsd">    <bean id="saxophone" class="com.csii.spring.Saxophone"></bean>  <bean id="guitar" class="com.csii.spring.Guitar"></bean>  <bean id="piano" class="com.csii.spring.Piano"></bean>  <!-- 注入list集合 --> <bean id="Jack" class="com.csii.spring.OneManBand">     <property name="instruments">         <list>             <ref bean="saxophone"/>             <ref bean="guitar"/>              <ref bean="piano"/>         </list>     </property> </bean> </beans>

然后新建一下几个类：乐器类Instrument.java，钢琴类Piano.java，萨克斯类：Saxophone，吉它类Guitar.java，一人乐队类OneManBand.java

public interface Instrument {public void paly();}

public class Guitar implements Instrument{Logger logger=LoggerFactory.getLogger(Saxophone.class);public void paly() {logger.info("******吉它表演。。。******");}}

public class Saxophone implements Instrument{Logger logger=LoggerFactory.getLogger(Saxophone.class);public void paly() {logger.info("******萨克斯表演。。。******");}}

public class Piano implements Instrument{Logger logger=LoggerFactory.getLogger(Saxophone.class);public void paly() {logger.info("******钢琴表演。。。******");}}

public class OneManBand implements Performer{private List<Instrument> instruments;public void perform() throws Exception {for (Instrument instrument : instruments) {instrument.paly();}}public void setInstruments(List<Instrument> instruments) {this.instruments = instruments;}}

然后写一个测试类就可以测试类：

public class Test {public static void main(String[] args) throws Exception {ApplicationContext ctx=         new ClassPathXmlApplicationContext("applicationContext.xml");OneManBand oneManBand=(OneManBand)ctx.getBean("Jack");oneManBand.perform();    }}

输出结果：

INFO 2015-05-31 21:48:53,235 [message] ******萨克斯表演。。。******
INFO 2015-05-31 21:48:53,235 [message] ******吉它表演。。。******
INFO 2015-05-31 21:48:53,235 [message] ******钢琴表演。。。******

2、Set属性注入跟list集合注入差不多，list允许元素有重复的值，set不能有重复值。xml中的配置也类似。

<bean id="Jack" class="com.csii.spring.OneManBand">     <property name="instruments">         <set>             <ref bean="saxophone"/>             <ref bean="guitar"/>              <ref bean="piano"/>         </set>     </property> </bean>

3、Map属性注入

applicationContext.xml中的配置

<?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"    xsi:schemaLocation="http://www.springframework.org/schema/beans      http://www.springframework.org/schema/beans/spring-beans.xsd     http://www.springframework.org/schema/aop            http://www.springframework.org/schema/aop/spring-aop-3.2.xsd">      <bean id="stage" class="com.csii.spring.Stage" factory-method="getInstance"></bean>  <bean id="saxophone" class="com.csii.spring.Saxophone"></bean>  <bean id="guitar" class="com.csii.spring.Guitar"></bean>  <bean id="piano" class="com.csii.spring.Piano"></bean>  <!-- Map注入 --> <bean id="Lucy" class="com.csii.spring.OnemanBandMap">     <property name="instruments">         <map>             <entry key="SAXOPHONE" value-ref="saxophone"></entry>              <entry key="GUITAR" value-ref="guitar"></entry>               <entry key="PIANO" value-ref="piano"></entry>         </map>     </property> </bean> </beans>

然后新建一个一人乐队类：OnemanBandMap.java（其它几个类同上面）

public class OnemanBandMap implements Performer{private Map<String,Instrument> instruments;public void perform() throws Exception {for (String key : instruments.keySet()) {Instrument instrument=instruments.get(key);instrument.paly();}}public void setInstruments(Map<String, Instrument> instruments) {this.instruments = instruments;}}

测试类：

public class Test {public static void main(String[] args) throws Exception {ApplicationContext ctx=         new ClassPathXmlApplicationContext("applicationContext.xml"); OnemanBandMap lucy=(OnemanBandMap)ctx.getBean("Lucy");    lucy.perform();    }}

输出结果：

   INFO  2015-05-31 21:55:07,599 [message] ******萨克斯表演。。。******    INFO  2015-05-31 21:55:07,599 [message] ******吉它表演。。。******    INFO  2015-05-31 21:55:07,599 [message] ******钢琴表演。。。******

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