原文：http://www.mkyong.com/spring/spring-is-not-working-in-value/

By?mkyong?|?February 4, 2015?| Last Updated : February 12, 2015

A simple Spring?@PropertySource?example to read a properties file.

db.properties db.driver=oracle.jdbc.driver.OracleDriver AppConfig.java @Configuration @PropertySource("classpath:db.properties") public class AppConfig {@Value("${db.driver}")private String driver;

But the property placeholder?${}?is unable to resolve in?@Value, if print out the?driver?variable, it will display string?${db.driver}?directly, instead of “oracle.jdbc.driver.OracleDriver”.

Solution

To resolve?${}?in Spring?@Value, you need to declare a?STATICPropertySourcesPlaceholderConfigurer?bean manually. For example :

AppConfig.java import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.PropertySource; import org.springframework.context.support.PropertySourcesPlaceholderConfigurer;@Configuration @PropertySource("classpath:db.properties") public class AppConfig {@Value("${db.driver}")private String driver;@Beanpublic static PropertySourcesPlaceholderConfigurer propertyConfigInDev() {return new PropertySourcesPlaceholderConfigurer();} }

For XML configuration, Spring will help you to register?PropertySourcesPlaceholderConfigurerautomatically.

<util:properties location="classpath:db.properties"/>

?

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