Spring(3.2.3)

如果 Bean 的属性是个集合，则可以使用 <list/>、<set/>、<map/> 和 <props/> 元素向 List、Set、Map 和 Properties 类型的属性注入值。

注入集合值的配置示例：

<bean id="moreComplexObject" class="example.ComplexObject">    <!-- results in a setAdminEmails(java.util.Properties) call -->    <property name="adminEmails">        <props>            <prop key="administrator">administrator@example.org</prop>            <prop key="support">support@example.org</prop>            <prop key="development">development@example.org</prop>        </props>    </property>    <!-- results in a setSomeList(java.util.List) call -->    <property name="someList">        <list>            <value>a list element followed by a reference</value>            <ref bean="myDataSource" />        </list>    </property>    <!-- results in a setSomeMap(java.util.Map) call -->    <property name="someMap">        <map>            <entry key="an entry" value="just some string" />            <entry key="a ref" value-ref="myDataSource" />        </map>    </property>    <!-- results in a setSomeSet(java.util.Set) call -->    <property name="someSet">        <set>            <value>just some string</value>            <ref bean="myDataSource" />        </set>    </property></bean>