如何使用@Bean批注配置子bean(How to configure child beans with @Bean annotation)

 我想在使用bean的@Bean类型定义时使用Spring的bean继承。 具体来说，让 
 
public class Serwis {
    Integer a;
    Integer b;
    Map<Integer, Integer> m = new HashMap<>();
}
 
 并假设基于xml的配置如下所示： 
 
<bean id="absSerwis" class="service.Serwis"
      p:a="11">
    <property name="m">
        <map>
            <entry key="111" value="111"></entry>
        </map>
    </property>
</bean>

<bean id="defSerwis" parent="absSerwis"
      p:b="12"
  />
 
 它确实创建了包含bean defSerwis的深层副本的bean absSerwis ; 特别是m的内容被复制。 现在，我想使用@Bean注释来定义像defSerwis这样的bean，比如 
 
@Autowired
@Qualifier("absSerwis")
private Serwis absSerwis;

@Bean
public Serwis cccSerwis() {
    Serwis s = new Serwis();
    BeanUtils.copyProperties(absSerwis, s); //wrong; does shallow copy
    return s;
}
 
 这样做的正确方法是什么？ 

I would like to use Spring's bean inheritance while employing the @Bean-type definition of beans. Specifically, let
 
public class Serwis {
    Integer a;
    Integer b;
    Map<Integer, Integer> m = new HashMap<>();
}
 
and suppose the xml-based configuration would look like:
 
<bean id="absSerwis" class="service.Serwis"
      p:a="11">
    <property name="m">
        <map>
            <entry key="111" value="111"></entry>
        </map>
    </property>
</bean>

<bean id="defSerwis" parent="absSerwis"
      p:b="12"
  />
 
which does create the bean defSerwis containing a deep copy of the bean absSerwis; in particular the contents of m are copied. Now, I would like to define beans like defSerwis using @Bean annotations, like
 
@Autowired
@Qualifier("absSerwis")
private Serwis absSerwis;

@Bean
public Serwis cccSerwis() {
    Serwis s = new Serwis();
    BeanUtils.copyProperties(absSerwis, s); //wrong; does shallow copy
    return s;
}
 
what is the proper way to do it?

原文：https://stackoverflow.com/questions/39724566