使用Spring @Configuration批注注入bean列表 [英] Inject a list of beans using Spring @Configuration annotation

问题描述

我有一个Spring bean，在Spring Bean中我依赖于其他bean的列表。我的问题是：如何将bean的通用列表注入该bean的依赖项？

I've got a Spring bean, and in the Spring Bean I have a dependency on a list of other beans. My question is: how can I inject a Generic list of beans as a dependency of that bean?

例如，一些代码：

public interface Color { }

public class Red implements Color { }

public class Blue implements Color { }

我的豆子：

public class Painter {
  private List<Color> colors;

  @Resource
  public void setColors(List<Color> colors) {
      this.colors = colors;
  }
}

@Configuration
public class MyConfiguration {

  @Bean
  public Red red() {
    return new Red();
  }

  @Bean
  public Blue blue() {
    return new Blue();
  }

  @Bean
  public Painter painter() {
    return new Painter();
  }
}

问题是：如何获取Painter中的颜色列表？另外，在旁注：我应该让@Configuration返回接口类型还是类？

The question is; how do I get the list of colors in the Painter? Also, on a side note: should I have the @Configuration return the Interface type, or the class?

感谢您的帮助！

推荐答案

你有什么应该工作，有一个 @Resource 或 @Autowired < setter上的/ code>应该将所有Color实例注入 List< Color> 字段。

What you have should work, having a @Resource or @Autowired on the setter should inject all instances of Color to your List<Color> field.

如果你想更明确，你可以将一个集合作为另一个bean返回：

If you want to be more explicit, you can return a collection as another bean:

@Bean
public List<Color> colorList(){
    List<Color> aList = new ArrayList<>();
    aList.add(blue());
    return aList;
}     

并以此方式将其用作自动装配字段：

and use it as an autowired field this way:

@Resource(name="colorList") 
public void setColors(List<Color> colors) {
    this.colors = colors;
}

OR

@Resource(name="colorList")
private List<Color> colors;

关于返回接口或实现的问题，任何一个应该可以工作，但接口应该是首选。

On your question about returning an interface or an implementation, either one should work, but interface should be preferred.

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