Spring依赖注入 — 集合属性配置

对于数组、java.util.List、java.util.Set、java.util.Map等集合对象，在注入前必须填充入一些对象至集合中，然后再将集合对象注入至所需的Bean，也可以交由Spring的IoC容器来自动维护或生成集合对象，并完成依赖注入。

 

完整实例

public class SomeBean {     private String[] someStrArray;     private Some[] someObjArray;     private List someList;     private Set someSet;     private Map someMap;     private Properties prop; // 各Field的getter、setter方法 }   <bean id="some1" class="cn.itcast.spring.collection.Some"> <property name="val" value="some instance1" /> bean> <bean id="some2" class="cn.itcast.spring.collection.Some"> <property name="val" value="some instance2" /> bean> <bean id="some3" class="cn.itcast.spring.collection.Some"> <property name="val" value="some instance3" /> bean> <bean id="someBean" class="cn.itcast.spring.collection.SomeBean"> <property name="someStrArray"> <list value-type="java.lang.String"> <value>some string1value> <value>some string2value> <value>some string3value> list> property> <property name="someObjArray"> <list value-type="cn.itcast.spring.collection.Some"> <ref bean="some1"/> <ref bean="some2"/> <ref bean="some3"/> list> property> <property name="someList"> <list value-type="cn.itcast.spring.collection.Some"> <ref bean="some1"/> <ref bean="some2"/> <ref bean="some3"/> list>        property> <property name="someSet"> <set value-type="cn.itcast.spring.collection.Some"> <ref bean="some1"/> <ref bean="some2"/> <ref bean="some3"/> set>        property> <property name="someMap"> <map key-type="java.lang.String" value-type="cn.itcast.spring.collection.Some"> <entry value-ref="some1" key="key1">entry> <entry value-ref="some2" key="key2">entry> <entry value-ref="some3" key="key3">entry> map> property> <property name="prop"> <props> <prop key="prop1_key">prop1_valueprop> <prop key="prop2_key">prop2_valueprop> <prop key="prop3_key">prop3_valueprop> props> property> bean>