我正在尝试为ioc使用util:constant标签,但是我收到以下错误消息:
线程“main”中的异常org.springframework.beans.factory.BeanDefinitionStoreException:在类路径资源[spring.xml]中定义名称为'threadPoolExecutor'的bean时出错:未知属性子元素:<util:constant>
这是我的xml:
<?xml version="1.0" encoding="UTF-8"?>
<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-3.1.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsd">
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<value>classpath:config.properties</value>
</property>
</bean>
<bean id="main" class="pikefin.Main">
<property name="executorSample" ref="executorSample"/>
</bean>
<bean id="executorSample" class="pikefin.ExecutorSample">
<constructor-arg ref="threadPoolExecutor" />
</bean>
<bean id="threadPoolExecutor" class="java.util.concurrent.ThreadPoolExecutor">
<constructor-arg index="0" value="2"/>
<constructor-arg index="1" value="2"/>
<constructor-arg index="2" value="10"/>
<constructor-arg index="3"><util:constant static-field="java.util.concurrent.TimeUnit.SECONDS"/></constructor-arg>
<constructor-arg index="4" ref="arrayBlockingPool"/>
</bean>
<bean id="arrayBlockingPool" class="java.util.concurrent.ArrayBlockingQueue">
<constructor-arg value="5"/>
</bean>
</beans>
更新:
这是添加了 <value>
标记的我的xml,它会导致不同的错误消息:
Invalid content was found starting with element 'util:constant'. No child element is expected at this point.
(旁注:出于某种原因,在SO中发布时,我的格式控件已经消失)
<?xml version="1.0" encoding="UTF-8"?>
<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-3.1.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsd">
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<value>classpath:config.properties</value>
</property>
</bean>
<bean id="main" class="pikefin.Main">
<property name="executorSample" ref="executorSample"/>
</bean>
<bean id="executorSample" class="pikefin.ExecutorSample">
<constructor-arg ref="threadPoolExecutor" />
</bean>
<bean id="threadPoolExecutor" class="java.util.concurrent.ThreadPoolExecutor">
<constructor-arg index="0" value="2"/>
<constructor-arg index="1" value="2"/>
<constructor-arg index="2" value="10"/>
<constructor-arg index="3">
<value>
<util:constant static-field="java.util.concurrent.TimeUnit.SECONDS"/>
</value>
</constructor-arg>
<constructor-arg index="4" ref="arrayBlockingPool"/>
</bean>
<bean id="arrayBlockingPool" class="java.util.concurrent.ArrayBlockingQueue">
<constructor-arg value="5"/>
</bean>
</beans>
1 回答
对于枚举,您可以直接分配值,Spring将负责将其绑定到正确的枚举:
此外,您的原始条目完美地为我工作: