Spring xml动态属性占位符构造 [英] Spring xml dynamic property placeholder construction

问题描述

我想动态构造一个属性值表达式，例如

I would like to dynamically construct a property value expression, as in

<property name="server" value="#{'${host}' + {systemProperties['myEnv']}}" />

假设属性托管服务器存在于属性文件中，其值为 myserver.net，并且系统属性myEnv已设置为'UAT'，那么此表达式将得出'myserver.netUAT'的值。

Let's say the property host exists in a property file aand it's value is 'myserver.net' and the system property myEnv has been set to 'UAT', then this expression results in a value of 'myserver.netUAT'.

如果整个串联后进行评估。目前，它正在查找{host}键，然后附加属性。我希望它查找键$ {host.UAT}

What I would like if for the whole lot to be evaluated after the concatenation. Right now it's looking up {host} key then appending the property. I would like it to lookup the key ${host.UAT}

是否有可能实现这一目标。

Is it at all possible to achieve this.

推荐答案

这可行...

<util:properties id="props" location="foo.properties" />

<context:property-placeholder properties-ref="props" />

<bean id="foo" class="foo.Foo">
    <property name="foo" value="#{props['${host}' + systemProperties['foo']]}" />
</bean>

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