Question

这是我的应用程序：

public static void main( String[] args ) {
    AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(Config.class);

    //run the importer
    final ImportNewOrders importer = (ImportNewOrders) ApplicationContextProvider.getApplicationContext().getBean("importNewOrders");
    importer.run();
    //importer.runInBackground();
}

这是我的配置：

@Configuration
@ComponentScan(basePackages = {
        "com.production"
})
@PropertySource(value = {
        "classpath:/application.properties",
        "classpath:/environment-${MY_ENVIRONMENT}.properties"
})
@EnableJpaRepositories("com.fettergroup.production.repositories")
@EnableTransactionManagement
public class Config {

    .... skipping things that aren't relevant

    @Bean
    public ImportNewOrders importNewOrders() {
        return new ImportNewOrders();
    }

这是我的班级......

@Component
public class ImportNewOrders implements Task {

    private final static Logger logger = Logger.getLogger(ImportNewOrders.class.getName());

    @Autowired
    private OrderService orderService;

    @Autowired
    private ImportOrderRequest importOrderRequest;

    @Value("${api.user}")
    private String apiUser;

    @Value("${api.password}")
    private String apiPassword;

    @Value("${api.orders.pingFrequency}")
    private String pingFrequency;

最后是application.properties：

# ------------------- Application settings -------------------

#Base URL to the API application
api.baseUrl=http://localhost:9998

#Unique token used to authenticate this vendor
api.vendor.token=asdf

#API credentials
api.user=myuser
api.password=mypassword

#How often to check for new orders; frequency is in seconds
api.orders.pingFrequency=60

这工作在一两个小时前，现在它决定它不喜欢这些价值观。我不知道为什么。一切看起来都对我不错。

更新

@Configuration
@ComponentScan(basePackages = {
        "com.production"
})
@PropertySource(value = {
        "classpath:/application.properties",
        "classpath:/environment-${MY_ENVIRONMENT}.properties"
})
@EnableJpaRepositories("com.production.repositories")
@EnableTransactionManagement
public class Config {
    @Value("${db.url}")
    private static String PROPERTY_DATABASE_URL;

    @Bean
    public DataSource dataSource() {
        MysqlDataSource dataSource = new MysqlDataSource();

        dataSource.setUrl(PROPERTY_DATABASE_URL); //is null
        /*dataSource.setUser(environment.getRequiredProperty(PROPERTY_NAME_DATABASE_USER));
        dataSource.setPassword(environment.getRequiredProperty(PROPERTY_NAME_DATABASE_PASSWORD));*/

        return dataSource;
    }

    @Bean
    public PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer () {
        return new PropertySourcesPlaceholderConfigurer();
    }
}

Answer 1

您的@Configuration找到了您的属性文件，并且因为@PropertySource而将其用于该类中的数据库属性。但@Value字段和${}评估需要更多。

来自Javadoc for @PropertySource

为了解决定义中的$ {...}占位符或 @Value注释使用PropertySource中的属性，必须使用注册PropertySourcesPlaceholderConfigurer。有时候是这样的在XML中使用时自动，但是必须在使用时使用静态@Bean方法显式注册 @Configuration类。请参阅“使用外部化值” @Configuration Javadoc的一节和“关于。的注释 BeanFactoryPostProcessor-返回@Bean Javadoc的@Bean方法细节和例子。

所以宣布一个

@Bean
public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() {
    PropertySourcesPlaceholderConfigurer p = new PropertySourcesPlaceholderConfigurer();
    p.setLocation(new ClassPathResource("your properties path"));
    // other properties
    return p;
}

在您的配置类中，或者如果您使用@PropertySource，则ach已在评论中恰当地提及您可以完全省略setLocation：

@Configuration
@PropertySource(value="classpath:your_file.properties")
public class MyConfiguration{

    @Bean
    public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer()    {
        PropertySourcesPlaceholderConfigurer p = new PropertySourcesPlaceholderConfigurer();
    return p;
    }
}

拥有PropertySourcesPlaceholderConfigurer

时，您不需要环境

但是，在大多数情况下，应用程序级bean不需要＆gt; 直接与环境交互，但可能必须 $ {...}属性值由属性占位符配置器替换例如PropertySourcesPlaceholderConfigurer，它本身就是 EnvironmentAware和Spring 3.1默认情况下注册时使用＆lt;上下文：属性占位符/＆GT;

@Value注释未正确设置

1 个答案: