Shulou(Shulou.com)06/01 Report--

This article mainly explains what the @ConditionalOnMissingBean parameter does. Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Let's let Xiaobian take you to learn "what is the role of @ConditionalOnMissingBean parameter"!

This annotation indicates that if there is a bean for the class it modifies, there is no need to create the bean;

This annotation can be passed parameters such as @ConditionOnMissingBean(name = "example"),

This means that if a bean with the name "example" exists, the annotated code block will not execute.

@Bean @ConditionalOnMissingBean(name = "imageValidateCodeGenerator") public ValidateCodeGenerator imageValidateCodeGenerator() { ImageCodeGenerator codeGenerator = new ImageCodeGenerator(); codeGenerator.setSecurityProperty(securityProperties); return codeGenerator; }

Testing found that @ConditionOnMissingBean can only be used on methods annotated with @Bean, not classes annotated with @Component.

At this point, I believe everyone has a deeper understanding of "@ConditionalOnMissingBean parameter", so let's actually operate it! Here is the website, more related content can enter the relevant channels for inquiry, pay attention to us, continue to learn!

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