自动连接的环境为空

properties java environment spring autowired

2022-08-31 20:38:43

我在将环境连接到我的Spring项目时遇到问题。在本类中

@Configuration
@ComponentScan(basePackages = "my.pack.offer.*")
@PropertySource("classpath:OfferService.properties")
public class PropertiesUtil {
    @Autowired
    private Environment environment;



    @Bean
    public String load(String propertyName)
    {
        return environment.getRequiredProperty(propertyName);
    }
}

环境始终为空。

答案 1

自动布线的发生时间晚于调用的时间（出于某种原因）。load()

解决方法是实现并依赖Spring调用方法：EnvironmentAwaresetEnvironment()

@Configuration
@ComponentScan(basePackages = "my.pack.offer.*")
@PropertySource("classpath:OfferService.properties")
public class PropertiesUtil implements EnvironmentAware {
    private Environment environment;

    @Override
    public void setEnvironment(final Environment environment) {
        this.environment = environment;
    }

    @Bean
    public String load(String propertyName)
    {
        return environment.getRequiredProperty(propertyName);
    }
}

答案 2

更改@Resource（来自javax.annotation）并使其例如：@Autowiredpublic

@Configuration
@PropertySource("classpath:database.properties")
public class HibernateConfigurer {

    @Resource
    public Environment env;

    @Bean
    public DataSource dataSource() {
        BasicDataSource dataSource = new BasicDataSource();
        dataSource.setDriverClassName(env.getProperty("database.driverClassName"));
        dataSource.setUrl(env.getProperty("database.url"));
        dataSource.setUsername(env.getProperty("database.username"));
        dataSource.setPassword(env.getProperty("database.password"));
        dataSource.setValidationQuery(env.getProperty("database.validationQuery"));

        return dataSource;
    }
}

而且您必须以这种方式在 WebApplicationInitializer 中注册您的配置器类

AnnotationConfigWebApplicationContext context = new AnnotationConfigWebApplicationContext();
context.register(ApplicationConfigurer.class); //ApplicationConfigurer imports HibernateConfigurer

它为我工作！你可能想检查我做的一个测试项目。