Spring IOC 注入集合

The <list/>, <set/>, <map/>, and <props/> elements allow properties and arguments of the Java Collection type List, Set, Map, and Properties, respectively, to be defined and set.

<property name="adminEmails">
    <props>
        <prop key="administrator">[email protected]</prop>
        <prop key="support">[email protected]</prop>
        <prop key="development">[email protected]</prop>
    </props>
  </property>

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前提：com.dao.impl.UserDAOImpl类中的sets lists maps集合，必须有set方法

<bean name="userDAO" class="com.dao.impl.UserDAOImpl">
   <property name="sets">
    <set>
     <value>1</value>
     <value>2</value>
    </set>
   </property>

   <property name="lists">
    <list>
     <value>1</value>
     <value>2</value>
     <value>3</value>
    </list>
   </property>

   <property name="maps">
    <map>
     <entry key="1" value="1"></entry>
     <entry key="2" value="2"></entry>
     <entry key="3" value="3"></entry>
     <entry key="4" value="4"></entry>
    </map>
   </property>
  </bean>

很少用，用于别人提供的类