当多个配置文件处于非活动状态时，如何有条件地声明Bean? [英] How to conditionally declare Bean when multiple profiles are not active?

问题描述

在我的Spring-Boot-App中，我想有条件地声明一个Bean，具体取决于(未)加载的spring-profiles.

条件:

Profile "a" NOT loaded  
AND  
Profile "b" NOT loaded 

到目前为止，我的解决方案(有效):

@Bean
@ConditionalOnExpression("#{!environment.getProperty('spring.profiles.active').contains('a') && !environment.getProperty('spring.profiles.active').contains('b')}")
    public MyBean myBean(){/*...*/}

是否有更优雅(更短)的方式来解释这种情况?
特别是我想在这里摆脱Spring Expression Language的使用.

解决方案

从Spring 5.1.4(包含在Spring Boot 2.1.2中)开始，可以在配置文件字符串注释内使用配置文件表达式.所以:

在 Spring 5.1.4(Spring Boot 2.1.2)及更高版本中很容易:

@Component
@Profile("!a & !b")
public class MyComponent {}

在 Spring 4.x和5.0.x 中:

此Spring版本有很多方法，每种方法都有其优点和缺点.当涉及的组合不多时，我个人喜欢 Spring Profile-如何包含AND添加两个配置文件的条件?

Spring:如何在个人资料"中执行AND?

In my Spring-Boot-App I want to conditionally declare a Bean, depending on (un)loaded spring-profiles.

The conditon:

Profile "a" NOT loaded  
AND  
Profile "b" NOT loaded 

My solution so far (which works):

@Bean
@ConditionalOnExpression("#{!environment.getProperty('spring.profiles.active').contains('a') && !environment.getProperty('spring.profiles.active').contains('b')}")
    public MyBean myBean(){/*...*/}

Is there a more elegant (and shorter) way to explain this condition?
Especially I want to get rid of the usage of Spring Expression Language here.

解决方案

Since Spring 5.1.4 (incorporated in Spring Boot 2.1.2) it is possible to use a profile expression inside profile string annotation. So:

In Spring 5.1.4 (Spring Boot 2.1.2) and above it is as easy as:

@Component
@Profile("!a & !b")
public class MyComponent {}

In Spring 4.x and 5.0.x:

There are many approaches for this Spring versions, each one of them has its pro's and con's. When there aren't many combinations to cover I personally like @Stanislav answer with the @Conditional annotation.

Other approaches can be found in this similar questions:

Spring Profile - How to include AND condition for adding 2 profiles?

Spring: How to do AND in Profiles?

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