Spring中注入List，Set，Map,Properties

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>