Web#Bean conditions. The @ConditionalOnBean and @ConditionalOnMissingBean annotations allow a bean to be included based on the presence or absence of specific beans. You can use the value attribute to specify beans by type, or name to specify beans by name. The search attribute allows you to limit the ApplicationContext hierarchy that … WebApr 11, 2024 · 作用：按照一定的条件进行判断，在满足给定条件后才会注册对应的bean对象到Spring的IOC容器中。. 位置：方法、类. @Conditional本身是一个父注解，派生出大 …

Make @ConditionalOnBean with multiple beans an AND rather …

WebJun 11, 2024 · Similar to @ConditionalOnBean, but load a bean only when a single candidate for the specified bean class can be determined. The condition will also match if multiple matching bean instances are already contained in the BeanFactory but a primary @Primary candidate has been defined; essentially, the condition match if auto-wiring a … Web@ConditionalOnBean: bean存在的时候注入，不存在的时候不注入 @ConditionalOnProperty: 主要可用于通过和 SpringBoot 当中 application 配置文件来使用. 所以 Condition 注解就一句话总结就是，该注解作用在对象的配置类的对象方法上，通过条件触发创建 Bean compress pdf to less than 2 kb

How Spring Boot’s Autoconfigurations Work - Marco Behler

WebAnnotation Interface ConditionalOnMissingBean. @Conditional that only matches when no beans meeting the specified requirements are already contained in the BeanFactory. None of the requirements must be met for the condition to match and the requirements do not have to be met by the same bean. When placed on a @Bean method, the bean class ... WebThe @ConditionalOnExpression annotation lets configuration be included based on the result of a SpEL (Spring Expression Language) expression. For this example the Module class is only loaded if a particular SpEL is enabled. This way, you might create similar modules that are only loaded if their respective SpEL has been found or enabled. WebAnnotation Interface ConditionalOnMissingBean. @Conditional that only matches when no beans meeting the specified requirements are already contained in the BeanFactory. … compress pdf to small