Example use-case: properties file passes in a numeric value in millis, and you want to use it in seconds.
Your .properties file:
jdbc.timeout= 2000
Your applicationContext.xml currently
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url"value="jdbc:mysql://myserver/mydb" />
<property name="username" value="user" />
<property name="password" value="changeme" />
<property name="validationQuery" value="SELECT 1;"/>
<property name="validationQueryTimeout" value="${jdbc.timeout}" />
</bean>
You want the validationQueryTimeout value to be in seconds, how do you convert it?
如果您使用的是Spring 3.0或更高版本,则可以使用SpEL表达式内的属性,如下所示:
<property name="validationQueryTimeout" value="#{${jdbc.timeout}/1000}" />
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