Spring – Conditional statement inside Spring config

spring

How to have conditional statement within a spring configuration file

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"

How do i code this in spring config?

Best Solution

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>

Related Solutions

Java – How to inject a property value into a Spring Bean which was configured using annotations

You can do this in Spring 3 using EL support. Example:

@Value("#{systemProperties.databaseName}")
public void setDatabaseName(String dbName) { ... }

@Value("#{strategyBean.databaseKeyGenerator}")
public void setKeyGenerator(KeyGenerator kg) { ... }

systemProperties is an implicit object and strategyBean is a bean name.

One more example, which works when you want to grab a property from a Properties object. It also shows that you can apply @Value to fields:

@Value("#{myProperties['github.oauth.clientId']}")
private String githubOauthClientId;

Here is a blog post I wrote about this for a little more info.

Java – How to assign bean’s property an Enum value in Spring config file

Have you tried just "TYPE1"? I suppose Spring uses reflection to determine the type of "type" anyway, so the fully qualified name is redundant. Spring generally doesn't subscribe to redundancy!

Best Solution

Related Solutions

Java – How to inject a property value into a Spring Bean which was configured using annotations

Java – How to assign bean’s property an Enum value in Spring config file

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