使用yaml配置注入bean列表

Question

app:
    beans:
        - BeanA
        - BeanB

结果是-

Property: app.beans[0]
    Value: 
    Origin: class path resource [application-local.yaml]:86:6
    Reason: No converter found capable of converting from type [java.lang.String] to type [com.myprojects.BeanInterface]

属性BeanA和BeanB只是字符串值，那么如何指定bean名称呢？

Answer 1

一种解决方案是在应用程序启动时向列表中注入bean，然后检索该bean以供以后使用。向我展示一个使用BeanFactory获取bean并将其添加到列表的示例：

将bean按给定名称从application.yaml注入到列表中的配置类：

@Configuration
public class DynamicBeanInjection
{
    @Value( "${app.beans}" )
    private String[] beans;

    @Autowired
    private BeanFactory beanFactory;

    @Bean
    List<DynamicInterface> getDynamicBeans( )
    {
        final List<DynamicInterface> dynamicInterfaces = new ArrayList<>( );
        for ( String bean : beans )
        {
            dynamicInterfaces.add( beanFactory.getBean( bean, DynamicInterface.class ) );
        }
        return dynamicInterfaces;
    }
}

创建DynamicInterface及其3个实现：

public interface DynamicInterface
{
}

@Component("FirstDynamic")
public class FirstDynamic implements DynamicInterface
{
}

@Component("SecondDynamic")
public class SecondDynamic implements DynamicInterface
{
}

@Component("ThirdDynamic")
public class ThirdDynamic implements DynamicInterface
{
}

app:
  beans: FirstDynamic, SecondDynamic