我有这个工厂类,我想通过 spring 连接到 map 的运行时配置。该 map 包含一个枚举对象和标准 pojo。
public class GenericEntityFactoryImpl implements GenericEntityFactory
{
private Map<IndexType,IEntity> indexEntityMap = null;
@Override
public IEntity getIndexEntity(IndexType index) {
return indexEntityMap.get(index);
}
public Map<IndexType, IEntity> getIndexEntityMap() {
return indexEntityMap;
}
public void setIndexEntityMap(Map<IndexType, IEntity> indexEntityMap) {
this.indexEntityMap = indexEntityMap;
}
}
我的 spring util:map 接线有问题,因为我不确定在定义键值时如何正确引用特定的枚举类型。映射值的 bean ref 很简单。所有spring map接线的例子似乎都假设key是一个字符串!
<!-- the value object bean -->
<bean id="cell" class="com.xx.xx.common.index.entity.CellEntity"/>
<bean id="genericEntityFactory" class="com.xx.xx.common.index.GenericEntityFactoryImpl">
<util:map
id="indexEntityMap"
map-class="java.util.HashMap"
key-type="com.xx.xx.common.index.IndexType"
value-type="com.xx.xx.common.index.GenericEntityFactoryImpl">
<entry key="CELL">
<ref bean="cell"/>
</entry>
</util:map>
</bean>
编辑
所以我重构了映射
<bean id="genericEntityFactory" class="com.xx.xx.common.index.GenericEntityFactoryImpl" >
<property name="indexEntityMap">
<map >
<entry key="com.xx.xx.common.index.CELL"><ref bean="cell"/></entry>
</map>
</property>
</bean>
但是 Spring 会很聪明的假设失败了......
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'genericEntityFactory' defined in class path resource [com/xx/xx/common/index/index-application-context.xml]: Initialization of bean failed; nested exception is org.springframework.beans.TypeMismatchException: Failed to convert property value of type [java.util.LinkedHashMap] to required type [java.util.Map] for property 'indexEntityMap'; nested exception is java.lang.IllegalArgumentException: Cannot convert value of type [java.lang.String] to required type [com.xx.xx.common.index.IndexType] for property 'indexEntityMap[com.xx.xx.common.index.CELL]': no matching editors or conversion strategy found
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:480)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
at java.security.AccessController.doPrivileged(Native Method)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:221)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:429)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:729)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:381)
at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:84)
at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:42)
at org.springframework.test.context.TestContext.loadApplicationContext(TestContext.java:173)
at org.springframework.test.context.TestContext.getApplicationContext(TestContext.java:197)
... 17 more
Caused by: org.springframework.beans.TypeMismatchException: Failed to convert property value of type [java.util.LinkedHashMap] to required type [java.util.Map] for property 'indexEntityMap'; nested exception is java.lang.IllegalArgumentException: Cannot convert value of type [java.lang.String] to required type [com.xx.xx.common.index.IndexType] for property 'indexEntityMap[com.xx.xx.common.index.CELL]': no matching editors or conversion strategy found
at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:391)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.convertForProperty(AbstractAutowireCapableBeanFactory.java:1288)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1249)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1010)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:472)
... 32 more
Caused by: java.lang.IllegalArgumentException: Cannot convert value of type [java.lang.String] to required type [com.xx.xx.common.index.IndexType] for property 'indexEntityMap[com.xx.xx.common.index.CELL]': no matching editors or conversion strategy found
at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:219)
at org.springframework.beans.TypeConverterDelegate.convertToTypedMap(TypeConverterDelegate.java:508)
at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:194)
at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:138)
at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:386)
... 36 more
最佳答案
我找到了一个解决方法,将我计划添加到 map 中的每个枚举定义为一个单独的 bean - 感谢 creating-spring-bean-from-java-5-enum
<bean id="CELL" class="com.xx.xx.common.index.IndexType" factory-method="valueOf">
<constructor-arg>
<value>CELL</value>
</constructor-arg>
</bean>
<bean id="APN" class="com.xx.xx.common.index.IndexType" factory-method="valueOf">
<constructor-arg>
<value>APN</value>
</constructor-arg>
</bean>
定义了枚举后,我可以在 map 中对它们进行键引用
<bean id="genericEntityFactory" class="com.xx.xx.common.index.GenericEntityFactoryImpl" >
<property name="indexEntityMap">
<map>
<entry key-ref="CELL"><ref bean="cell"/></entry>
<entry key-ref="APN"><ref bean="apn"/></entry>
</map>
</property>
</bean>
关于java - Spring Framework : Populating a Map<Enum, Object> with util:map,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/3627897/