配置类中的 getBeansOfType

发布于 2024-12-18 10:10:29 字数 645 浏览 0 评论 0原文

我的春季课程有问题。我需要获取 Configuration 类中某个类型的所有 Bean，以便将它们提供给另一个类。

现在的问题是，我不能这样做，除非我启动一个 ApplicationContext 但这不起作用，因为我调用的 Config 类使用我调用的配置类，所以我得到一个无限循环...

例如：

@Configuration
@Import(Calling.class)
public class MyConfig{
@Bean
public ExampleClass aBean(){
...
return aObject;
}
}

@Configuration
@Import(MyConfig.class)
public class Calling{

@Bean
public Foo anotherBean(){
ConfigurableApplicationContext ctx = new AnnotationConfigApplicationContext(myConfig.class);
ctx.getBeansOfType(ExampleClass.class);
return aObject;
}
}

我可以使用任何功能或模式来获取这些 Bean 吗？

原文

I have a problem with my Spring Classes. I need to get all Beans of a type inside a Configuration class to give them to a another class.

The Problem now is, that I cant do that unless I startup a ApplicationContext but that doesn't work, because the Config class I call up uses the config class I'm calling from, so I get a endless loop...

as example:

@Configuration
@Import(Calling.class)
public class MyConfig{
@Bean
public ExampleClass aBean(){
...
return aObject;
}
}

@Configuration
@Import(MyConfig.class)
public class Calling{

@Bean
public Foo anotherBean(){
ConfigurableApplicationContext ctx = new AnnotationConfigApplicationContext(myConfig.class);
ctx.getBeansOfType(ExampleClass.class);
return aObject;
}
}

Is there any functionality or pattern I can use to get these Beans?

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梦境 2024-12-25 10:10:29

使用@Configuration，您需要非常小心，不要从上下文中“拉”bean，因为您经常会遇到这些无限循环。

试试这个：

@Configuration
@Import(Calling.class)
public class MyConfig {
   @Bean
   public ExampleClass aBean() {
      ...
      return aObject;
   }
}

@Configuration
public class Calling {

   private @Autowired List<ExampleClass> exampleBeans;

   @Bean
   public Foo anotherBean() {
      return aObject;
   }
}

这种声明性方法应该有望解决无限循环问题。

另请注意，您应该避免循环@Import。仅朝一个方向执行此操作，如上例所示。

With @Configuration, you need to be very careful not to "pull" beans from the context, since you often get these infinite loops.

Try this instead:

@Configuration
@Import(Calling.class)
public class MyConfig {
   @Bean
   public ExampleClass aBean() {
      ...
      return aObject;
   }
}

@Configuration
public class Calling {

   private @Autowired List<ExampleClass> exampleBeans;

   @Bean
   public Foo anotherBean() {
      return aObject;
   }
}

This declarative approach should hopefully get around the infinite loop problem.

Note also, you should avoid cyclic @Import. Do it in one direction only, as in the above example.

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