如何将@ConfigurationProperties自动装配到@Configuration？

Question

我有一个像这样定义的属性类:

@Validated
@ConfigurationProperties(prefix = "plugin.httpclient")
public class HttpClientProperties {
   ...
}

和这样的配置类:

@Configuration
@EnableScheduling
public class HttpClientConfiguration {

    private final HttpClientProperties httpClientProperties;

    @Autowired
    public HttpClientConfiguration(HttpClientProperties httpClientProperties) {
        this.httpClientProperties = httpClientProperties;
    }

    ...
}

在开始我的春季启动应用程序时,我得到了

Parameter 0 of constructor in x.y.z.config.HttpClientConfiguration required a bean of type 'x.y.z.config.HttpClientProperties' that could not be found.

这不是一个有效的用例,还是我必须如何声明依赖关系？

Answer 1

这是一个有效的用例,但是,HttpClientProperties由于它们未被组件扫描程序扫描,因此您不会被选中.你可以注释您HttpClientProperties有@Component:

@Validated
@Component
@ConfigurationProperties(prefix = "plugin.httpclient")
public class HttpClientProperties {
    // ...
}

另一种方法(如Stephane Nicoll所述)是@EnableConfigurationProperties()在Spring配置类上使用注释,例如:

@EnableConfigurationProperties(HttpClientProperties.class) // This is the recommended way
@EnableScheduling
public class HttpClientConfiguration {
    // ...
}

这在Spring引导文档中也有描述.