java 使用 Spring @Configuration 注解注入 bean 列表
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Inject a list of beans using Spring @Configuration annotation
提问by Erik Pragt
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?
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 Generic 的 bean 列表作为该 bean 的依赖项注入？
For example, some code:
例如，一些代码：
public interface Color { }
public class Red implements Color { }
public class Blue implements Color { }
My bean:
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();
}
}
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?
问题是; 如何获取 Painter 中的颜色列表？另外，附带说明：我应该让@Configuration 返回接口类型还是类？
Thanks for the help!
谢谢您的帮助！
回答by Biju Kunjummen
What you have should work, having a @Resourceor @Autowiredon the setter should inject all instances of Color to your List<Color>field.
你所拥有的应该可以工作，在二传手上有一个@Resource或@Autowired应该将 Color 的所有实例注入你的List<Color>领域。
If you want to be more explicit, you can return a collection as another bean:
如果你想更明确，你可以将一个集合作为另一个 bean 返回：
@Bean
public List<Color> colorList(){
List<Color> aList = new ArrayList<>();
aList.add(blue());
return aList;
}
and use it as an autowired field this way:
并以这种方式将其用作自动装配字段：
@Resource(name="colorList")
public void setColors(List<Color> colors) {
this.colors = colors;
}
OR
或者
@Resource(name="colorList")
private List<Color> colors;
On your question about returning an interface or an implementation, either one should work, but interface should be preferred.
关于返回接口或实现的问题，任何一个都应该工作，但接口应该是首选。
