使用System属性更改spring bean别名 [英] Change spring bean alias with System property

问题描述

我试图弄清楚是否可以通过系统属性更改spring别名配置.

I try to figure out whether it's possible to change a spring alias configuration through a system property.

这是配置:

<beans>
    <bean id="beanOne" ... />
    <bean id="beanTwo" ... />
    <bean id="beanThree" ... />
    <alias name="beanOne" alias="beanToUse" />

    <bean id="consumer" ...>
        <constructor-arg ref="beanToUse" />
    </bean>
</beans>

我希望能够使用JVM属性，例如用-Duse=beanThree选择另一个bean作为别名.

I'd like to be able to use a JVM property e.g. with -Duse=beanThree to select another bean for the alias.

不幸的是，使用直接解决方案<alias name="#{systemProperties.use}" alias="beanToUse" />会引发NoSuchBeanDefinitionException异常:(

Unfortunately using the straight forward solution <alias name="#{systemProperties.use}" alias="beanToUse" /> throws a NoSuchBeanDefinitionException exception :(

有什么建议吗?

推荐答案

您尝试使用spring 3.1配置文件吗?

Did you try to use spring 3.1 profiles?

<beans>
    <bean id="beanOne" ... />
    <bean id="beanTwo" ... />
    <bean id="beanThree" ... />
    <beans profile="A">
      <alias name="beanOne" alias="beanToUse" />
    </beans>

    <beans profile="B">
      <alias name="beanTwo" alias="beanToUse" />
    </beans>

    <bean id="consumer" ...>
        <constructor-arg ref="beanToUse" />
    </bean>
</beans>

，然后通过系统属性-Dspring.profiles.active=A选择.我没有在配置文件中尝试过别名，但是每个配置文件中都可以有替代的beanToUse定义:

and choose through system property -Dspring.profiles.active=A. I haven't tried aliases in profiles but you could just have alternative beanToUse definitions in each profile:

<beans>
    <beans profile="A">
      <bean id="beanToUse" ... defined as beanOne ... />
    </beans>

    <beans profile="B">
      <bean id="beanToUse" ... defined as beanTwo .../>
    </beans>

    <bean id="consumer" ...>
        <constructor-arg ref="beanToUse" />
    </bean>
</beans>

这篇关于使用System属性更改spring bean别名的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！