Spring依赖注入枚举值、常量

  1. Spring依赖注入枚举值、常量
  2. 构造器注入、Setter注入效果相同
  3. 利用FieldRetrievingFactoryBean实现
  4. xml配置方式
<?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 https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/util https://www.springframework.org/schema/util/spring-util.xsd">
        
	<bean id="demoTimeUnit1" class="test.DemoTimeUnit">
		<property name="time" value="60"/>
		<!-- 注入枚举值 -->
		<property name="timeUnit">
			<bean id="java.util.concurrent.TimeUnit.SECONDS"
				class="org.springframework.beans.factory.config.FieldRetrievingFactoryBean" />
		</property>
	</bean>
	
	<bean id="demoTimeUnit2" class="test.DemoTimeUnit">
    <property name="time" value="1"/>
    <!-- 注入枚举值 -->
    <property name="timeUnit">
      <util:constant static-field="java.util.concurrent.TimeUnit.MINUTES"/>
    </property>
  </bean>
</beans>

  1. 执行效果
    Spring依赖注入枚举值、常量
  2. 详细说明查见Spring文档
    https://docs.spring.io/spring-framework/docs/current/reference/html/core.html#xsd-schemas-util-constant
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