使用 PropertySourcesPlaceholderConfigurer @Bean 时找不到属性

Question

我们正在配置一个新的 Spring 应用程序，我们正在努力确定如何使我们的应用程序属性在每个环境中都不同。我们使用 PropertySourcesPlaceholderConfigurer @Beans 和 @Profile 来指定要使用哪个属性文件：

public abstract class BaseConfig implements InitializingBean, DisposableBean {

    private static final String LOCAL_CONFIG = "local/application.properties";
    private static final String DEV_CONFIG = "development/application.properties";
    private static final String STAGING_CONFIG = "staging/application.properties";
    private static final String PRODUCTION_CONFIG = "production/application.properties";

    @Bean
    @Profile("development")
    public static PropertySourcesPlaceholderConfigurer developmentPropertyPlaceholderConfigurer() {
        System.out.println("config'ing dev");
        PropertySourcesPlaceholderConfigurer configurer = new PropertySourcesPlaceholderConfigurer();
        configurer.setLocation(new ClassPathResource(DEV_CONFIG));
        return configurer;
    }

    @Bean
    @Profile("staging")
    public static PropertySourcesPlaceholderConfigurer stagingPropertyPlaceholderConfigurer() {
        System.out.println("config'ing staging");
        PropertySourcesPlaceholderConfigurer configurer = new PropertySourcesPlaceholderConfigurer();
        configurer.setLocation(new ClassPathResource(STAGING_CONFIG));
        return configurer;
    }

    // and so on...

}

我们向命令行添加了一个环境属性，似乎确实正确地选择了这些配置文件：

-Dspring.profiles.active="development"

我们在扫描 BaseConfig 时在日志中看到：

config'ing dev
2015-07-24T15:19:09,529 {} [ContainerBackgroundProcessor[StandardEngine[Catalina]]] INFO  o.s.c.s.PropertySourcesPlaceholderConfigurer - Loading properties file from class path resource [development/application.properties]

当我们尝试从其中一个文件中获取属性时，它不在 @Autowire 环境或 ApplicationContext 的环境中：

@Configuration
@EnableJpaRepositories(basePackages = { 
        "com.myapp.jpa.domain", "com.myapp.jpa.repositories" })
@EnableTransactionManagement
@PropertySource(value = "file:/my/home/dir/db.properties", ignoreResourceNotFound = true)
public class JpaConfig extends BaseConfig {

    @Autowired
    Environment environment;

    @Bean
    public DataSource dataSource() throws SQLException {
        String testProperty = environment.getProperty("test.property");
        logger.info("test.property from autowired environment: " + testProperty);

        ApplicationContext ctx = new GenericApplicationContext();
        Environment env = ctx.getEnvironment();
        boolean contains = env.containsProperty("test.property");
        logger.info("Does my environment contain the 'test.property' property? " + contains);
        logger.info("test.property from context: " + env.getProperty("test.property"));

        // ...
    }
}

这两个语句都打印了一个 null 属性。总之，看起来我想要读取的 application.properties 文件实际上正在被读取，但 Environment 中没有这些属性。我究竟做错了什么？我怀疑在创建 PropertySourcesPlaceholderConfigurer Bean 后我缺少一些东西来连接它。

2015-07-24T15:19:09,730 {} [ContainerBackgroundProcessor[StandardEngine[Catalina]]] INFO  x.y.z.JpaConfig - test.property from autowired environment: null
2015-07-24T15:19:09,731 {} [ContainerBackgroundProcessor[StandardEngine[Catalina]]] INFO  x.y.z.JpaConfig - Does my environment contain the 'test.property' property? false
2015-07-24T15:19:09,731 {} [ContainerBackgroundProcessor[StandardEngine[Catalina]]] INFO  x.y.z.JpaConfig - test.property from context: null

编辑 - 糟糕。我忘了在这里粘贴 development/application.properties 的样子：

test.property=from_development

编辑 - 有人询问了活动配置文件。我正在使用 Java 命令的 -D 属性设置它们。如果未设置，BaseConfig 中的正确方法不会是运行但它是。我添加了下面的代码来证明活动配置文件实际上已被设置：

for ( String activeProfile : environment.getActiveProfiles() ) {
    logger.info("active profile: " + activeProfile);
}

产生：

2015-07-24T16:02:48,179 {} [ContainerBackgroundProcessor[StandardEngine[Catalina]]] INFO  c.d.c.c.j.JpaConfig - active profile: development

Answer 1

看来我做错了。我开始走上了正确的道路，但后来出于某种原因出轨了。正确的方法是为每个环境设置 @Configuration 类并且每个指向不同的 application.properties 文件：

@Configuration
@Profile("development")
@PropertySource("classpath:development/application.properties")
public class DevelopmentConfig extends BaseConfig {
}

并且：

@Configuration
@Profile("production")
@PropertySource("classpath:production/application.properties")
public class ProductionConfig extends BaseConfig {
}

然后，您指定启动服务器时应在命令行上使用的配置文件：

-Dspring.profiles.active="development"

使用 PropertySourcesPlaceholderConfigurer @Bean 时找不到属性

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使用 PropertySourcesPlaceholderConfigurer @Bean 时找不到 属性

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使用 PropertySourcesPlaceholderConfigurer @Bean 时找不到属性