Spring注入容器类型List、Map、Properties、Set

下面的例子展示了如何注入

• List – <list/>
• Set – <set/>
• Map – <map/>
• Properties – <props/>

Spring beans

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import java.util.List; import java.util.Map; import java.util.Properties; import java.util.Set; public class Customer {     private List<Object> lists;     private Set<Object> sets;     private Map<Object, Object> maps;     private Properties pros;     //... }

　　配置文件：

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< 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-2.5.xsd">     < bean id="CustomerBean" class="com.mkyong.common.Customer">         <!-- java.util.List -->         < property name="lists">             < list >                 < value >1</ value >                 < ref bean="PersonBean" />                 < bean class="com.mkyong.common.Person">                     < property name="name" value="mkyongList" />                     < property name="address" value="address" />                     < property name="age" value="28" />                 </ bean >             </ list >         </ property >         <!-- java.util.Set -->         < property name="sets">             < set >                 < value >1</ value >                 < ref bean="PersonBean" />                 < bean class="com.mkyong.common.Person">                     < property name="name" value="mkyongSet" />                     < property name="address" value="address" />                     < property name="age" value="28" />                 </ bean >             </ set >         </ property >         <!-- java.util.Map -->         < property name="maps">             < map >                 < entry key="Key 1" value="1" />                 < entry key="Key 2" value-ref="PersonBean" />                 < entry key="Key 3">                     < bean class="com.mkyong.common.Person">                         < property name="name" value="mkyongMap" />                         < property name="address" value="address" />                         < property name="age" value="28" />                     </ bean >                 </ entry >             </ map >         </ property >         <!-- java.util.Properties -->         < property name="pros">             < props >                 < prop key="admin">admin@nospam.com</ prop >                 < prop key="support">support@nospam.com</ prop >             </ props >         </ property >     </ bean >     < bean id="PersonBean" class="com.mkyong.common.Person">         < property name="name" value="mkyong1" />         < property name="address" value="address 1" />         < property name="age" value="28" />     </ bean > </ beans >

运行：

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public class App {     public static void main( String[] args )     {         ApplicationContext context = new ClassPathXmlApplicationContext( "SpringBeans.xml" );         Customer cust = (Customer)context.getBean( "CustomerBean" );         System.out.println(cust);     } }

　　我们也可以使用ListFactoryBean。The ‘ListFactoryBean‘ class provides developer a way to create a concrete List collection class (ArrayList and LinkedList) in Spring’s bean configuration file.

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< bean id="CustomerBean" class="com.mkyong.common.Customer">         < property name="lists">             < bean class="org.springframework.beans.factory.config.ListFactoryBean">                 < property name="targetListClass">                     < value >java.util.ArrayList</ value >                 </ property >                 < property name="sourceList">                     < list >                         < value >1</ value >                         < value >2</ value >                         < value >3</ value >                     </ list >                 </ property >             </ bean >         </ property >     </ bean >

　　或者：加入：xmlns:util="http://www.springframework.org/schema/util"然后就可以：

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< beans xmlns="http://www.springframework.org/schema/beans"     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"     xmlns:util="http://www.springframework.org/schema/util"     xsi:schemaLocation="http://www.springframework.org/schema/beans     http://www.springframework.org/schema/beans/spring-beans-2.5.xsd     http://www.springframework.org/schema/util     http://www.springframework.org/schema/util/spring-util-2.5.xsd">     < bean id="CustomerBean" class="com.mkyong.common.Customer">         < property name="lists">             < util:list list-class="java.util.ArrayList">                 < value >1</ value >                 < value >2</ value >                 < value >3</ value >             </ util:list >         </ property >     </ bean > </ beans >

　　　　　　　　　SetFactoryBean　The ‘SetFactoryBean‘ class provides developer a way to create a concrete Set collection (HashSet and TreeSet) in Spring’s bean configuration file.

set和上面的一样：

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< bean id="CustomerBean" class="com.mkyong.common.Customer">         < property name="sets">             < util:set set-class="java.util.HashSet">                 < value >1</ value >                 < value >2</ value >                 < value >3</ value >             </ util:set >         </ property >     </ bean >

　　　　　　　　　MapFactoryBean　The ‘MapFactoryBean‘ class provides developer a way to create a concrete Map collection class (HashMap and TreeMap) in Spring’s bean configuration file.

map也一样：

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< bean id="CustomerBean" class="com.mkyong.common.Customer">         < property name="maps">             < util:map map-class="java.util.HashMap">                 < entry key="Key1" value="1" />                 < entry key="Key2" value="2" />                 < entry key="Key3" value="3" />             </ util:map >         </ property >     </ bean >