在春天使用.properties而不使用xml配置

Question

I found a way to use .properties files in spring when using Java-based Configuration and xml from this article. The illustrations is as follows. My question is " Is there any way to use .properties files only using Java-based configuration without using xml files? "

ie Is there any way to omit @ImportResource in following code and use pure Java-based configuration?

@Configuration
@ImportResource("classpath:/com/acme/properties-config.xml")
public class AppConfig {
   private @Value("${jdbc.url}") String url;
   private @Value("${jdbc.username}") String username;
   private @Value("${jdbc.password}") String password;

   public @Bean DataSource dataSource() {
      return new DriverManagerDataSource(url, username, password);
   }
}

properties-config.xml

<beans>
   <context:property-placeholder location="classpath:/com/acme/jdbc.properties"/>
</beans>

jdbc.properties

jdbc.url=jdbc:hsqldb:hsql://localhost/xdb
jdbc.username=sa
jdbc.password=

Sample Main method

public static void main(String[] args) {
   ApplicationContext ctx = new AnnotationConfigApplicationContext(AppConfig.class);
   TransferService transferService = ctx.getBean(TransferService.class);
   // ...
}

Answer 1

try like this

@Configuration
@PropertySource("/app.properties")
public class Test {
    @Value("${prop1}")
    String prop1;

    @Bean
    public static PropertySourcesPlaceholderConfigurer getPropertySourcesPlaceholderConfigurer() {
        return new PropertySourcesPlaceholderConfigurer();
    }
}

or using Environment

@Configuration
@PropertySource("/app.properties")
public class Test {
    @Autowired
    Environment env;

    @Bean
    public DataSource dataSource() {
        return new DriverManagerDataSource(env.getProperty("url"), env.getProperty("username"), env.getProperty("password"));
    }
}

read this article http://blog.springsource.org/2011/02/15/spring-3-1-m1-unified-property-management/ for more info