Spring配置中的条件语句 [英] Conditional statement inside Spring config

问题描述

如何在spring配置文件中包含条件语句

How to have conditional statement within a spring configuration file

我有String bean(b)，其值取决于属性(a)的值. a是根据其运行环境动态设置的.

I have String bean (b) whose value depends on the value of a property (a). a is set dynamically based on environment it runs.

if (a)
 b="yes"
else
 b="no"

如何在spring config中对此进行编码?

How do i code this in spring config?

推荐答案

正如Ryan所说的

As Ryan said SpEL can help. You should be able to do something like this in Spring xml:

<bean id="flag" class="java.lang.Boolean">
    <constructor-arg value="#{ systemProperties['system.propery.flag'] ?: false }" />
</bean>

<bean id="bean" class="com.my.MyBean">
    <property name="property" value="#{ flag ? 'yes' : 'no' }"/>
</bean>

这篇关于Spring配置中的条件语句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！