java - 如何在启动时 Autowiring 配置文件配置类？

Question

我想创建不同的数据库配置文件类，每个类都用于开发、生产和测试。

我在 http://spring.io/blog/2011/02/14/spring-3-1-m1-introducing-profile/ 的帮助下尝试了以下操作，但无法正确接线。为什么？

 interface DataConfig {
        DataSource dataSource();
    }

    @Configuration
    @Profile("dev")
    public class StandaloneDataConfig implements DataConfig {
        @Bean
        @Override
        public dataSource dataSource() {
            //return the ds
        }
    }

    @Configuration
    @Profile("prod")
    public class JndiDataConfig implements DataConfig { ... }

    @Configuration
    @PropertySource({"classpath:config.properties"})
    class AppConfig {
        @Autowired
        private DataConfig cfg;

    }

@Configuration
@ComponentScan
@Import(AppConfig.class)
@EnableTransactionManagement
public class SpringBootConfig extends SpringBootServletInitializer {
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(Application.class);
    }
}

配置属性:

spring.profiles.active=dev

结果:启动时出现异常

Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private DataConfig dataConfig; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [DataConfig] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:508)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:289)
    ... 34 common frames omitted

Spring 4.0.3.RELEASE

我的设置似乎总体上有效:如果我删除其中一个数据库上的 @Profile 注释，一切都会正确连接。

Answer 1

您需要将 config.properties 文件重命名为 application.properties，以便 Spring Boot 自动选取它。