Spring @ConditionalOnProperty 注释未按预期工作 [英] Spring @ConditionalOnProperty annotation not working as expected

问题描述

我在属性文件中定义了一个属性:property=true

I have a property defined inside a property file: property=true

然后我有 SomeClass.java 类，它应该创建一个属性配置 bean only 如果属性 property 设置为 true.

Then I have SomeClass.java class , which should create a Property Configuration bean only if the property property is set to true.

这是我的 SomeClass 类:

public class SomeClass {

  //this is the proerty which I set to true or false
  @Value("${property}")
  private String property;

  //this is the bean which needs to be created conditionally based on the property but at the moment it does not get created
  @Bean
  @ConditionalOnProperty(name="${property}", havingValue="true")
  public PropertyConfiguration propertyConfig() {
    // doesnt print anything because the bean does not get created
    System.out.print(property);
  }
}

如果我在 @ConditionalOnProperty 中添加 matchIfMissing = true，只是为了试验并看看 property 的值是什么，然后bean 确实被创建，我看到property的值是true.

If I add the matchIfMissing = true inside the @ConditionalOnProperty, just to experiment and to see what is the value of property, then the bean does get created and I see that the value of property is true.

如果我删除 matchIfMissing = true，将条件保留为 @ConditionalOnProperty(name="${property}", gettingValue="true") 并更改属性 property=true 从 true 到 false 永远不会创建 bean(对于 true 和 错误).

If I remove the matchIfMissing = true, leave the condition as @ConditionalOnProperty(name="${property}", havingValue="true") and change the property property=true from true to false the bean is never created (neither for true nor for false).

我该怎么办?bean 是根据属性有条件地创建的?

What should I do s.t. the bean gets created conditionally, based on the property?

推荐答案

请在您的班级上方添加@Configuration.

Please add @Configuration above your class.

组件扫描不包括您的类，为此需要在您的类之上添加 @Component 或任何其他继承的注释.那么你的 @Bean 应该是从 spring 中创建的.

The component scan does not include your class, to do so it is required to add a @Component or any other inherited annotation on top of your class. Then your @Bean should be created from spring.

希望这会有所帮助.

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