如何在Spring中从Application.Properties重新加载@Value属性？[副本]

Question

@Value("${my.property}")
private String prop;

但怎么做？

Answer 1

使用下面的bean每隔1秒重新加载config.properties。

@Component
public class PropertyLoader {

    @Autowired
    private StandardEnvironment environment;

    @Scheduled(fixedRate=1000)
    public void reload() throws IOException {
        MutablePropertySources propertySources = environment.getPropertySources();
        PropertySource<?> resourcePropertySource = propertySources.get("class path resource [config.properties]");
        Properties properties = new Properties();
        InputStream inputStream = getClass().getResourceAsStream("/config.properties");
        properties.load(inputStream);
        inputStream.close();
        propertySources.replace("class path resource [config.properties]", new PropertiesPropertySource("class path resource [config.properties]", properties));
    }
}

您的主要配置将如下所示：

@EnableScheduling
@PropertySource("classpath:/config.properties")
public class HelloWorldConfig {
}

而不是使用@value，每次您想要使用的最新属性

environment.get("my.property");