Spring学习笔记_装配bean_02

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。。。******