“Spring Boot 2 自动配置流程”的版本间的差异

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配置文件中是否存在 <code>spring.aop</code> 这个配置，如果存在了 <code>spring.aop.auto</code> 这个配置，并且它的值是“true”，那么这个类中的其他配置就生效，<code>matchIfMissing = true</code> 就算没有响应的配置，也认为满足条件，所以相当于这个配置是生效的
 
配置文件中是否存在 <code>spring.aop</code> 这个配置，如果存在了 <code>spring.aop.auto</code> 这个配置，并且它的值是“true”，那么这个类中的其他配置就生效，<code>matchIfMissing = true</code> 就算没有响应的配置，也认为满足条件，所以相当于这个配置是生效的
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再来看<syntaxhighlight lang="java">
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@Configuration(proxyBeanMethods = false)
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@ConditionalOnClass(Advice.class)
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static class AspectJAutoProxyingConfiguration {
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@Configuration(proxyBeanMethods = false)
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@EnableAspectJAutoProxy(proxyTargetClass = false)
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@ConditionalOnProperty(prefix = "spring.aop", name = "proxy-target-class", havingValue = "false",
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matchIfMissing = false)
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static class JdkDynamicAutoProxyConfiguration {
 +
 +
}
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 +
@Configuration(proxyBeanMethods = false)
 +
@EnableAspectJAutoProxy(proxyTargetClass = true)
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@ConditionalOnProperty(prefix = "spring.aop", name = "proxy-target-class", havingValue = "true",
 +
matchIfMissing = true)
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static class CglibAutoProxyConfiguration {
 +
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}
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}
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</syntaxhighlight><code>@Configuration</code> 说明这是一个配置类；
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<code>@ConditionalOnClass(Advice.class)</code> 类路径中是否存在 Advice.class 这个类；

2023年3月5日 (日) 06:25的版本

https://www.bilibili.com/video/BV19K4y1L7MT?p=15

以 spring-boot-autoconfigure-2.3.4.RELEASE.jar 中的 org.springframework.boot.autoconfigure.aop.AopAutoConfiguration 为例，分析自动配置流程

……
@Configuration(proxyBeanMethods = false)
@ConditionalOnProperty(prefix = "spring.aop", name = "auto", havingValue = "true", matchIfMissing = true)
public class AopAutoConfiguration {

	@Configuration(proxyBeanMethods = false)
	@ConditionalOnClass(Advice.class)
	static class AspectJAutoProxyingConfiguration {

		@Configuration(proxyBeanMethods = false)
		@EnableAspectJAutoProxy(proxyTargetClass = false)
		@ConditionalOnProperty(prefix = "spring.aop", name = "proxy-target-class", havingValue = "false",
				matchIfMissing = false)
		static class JdkDynamicAutoProxyConfiguration {

		}

		@Configuration(proxyBeanMethods = false)
		@EnableAspectJAutoProxy(proxyTargetClass = true)
		@ConditionalOnProperty(prefix = "spring.aop", name = "proxy-target-class", havingValue = "true",
				matchIfMissing = true)
		static class CglibAutoProxyConfiguration {

		}

	}

	@Configuration(proxyBeanMethods = false)
	@ConditionalOnMissingClass("org.aspectj.weaver.Advice")
	@ConditionalOnProperty(prefix = "spring.aop", name = "proxy-target-class", havingValue = "true",
			matchIfMissing = true)
	static class ClassProxyingConfiguration {

		ClassProxyingConfiguration(BeanFactory beanFactory) {
			if (beanFactory instanceof BeanDefinitionRegistry) {
				BeanDefinitionRegistry registry = (BeanDefinitionRegistry) beanFactory;
				AopConfigUtils.registerAutoProxyCreatorIfNecessary(registry);
				AopConfigUtils.forceAutoProxyCreatorToUseClassProxying(registry);
			}
		}

	}
}

@Configuration 说明这是一个配置类；

@ConditionalOnProperty(prefix = "spring.aop", name = "auto", havingValue = "true", matchIfMissing = true)

配置文件中是否存在 spring.aop 这个配置，如果存在了 spring.aop.auto 这个配置，并且它的值是“true”，那么这个类中的其他配置就生效，matchIfMissing = true 就算没有响应的配置，也认为满足条件，所以相当于这个配置是生效的

再来看

	@Configuration(proxyBeanMethods = false)
	@ConditionalOnClass(Advice.class)
	static class AspectJAutoProxyingConfiguration {

		@Configuration(proxyBeanMethods = false)
		@EnableAspectJAutoProxy(proxyTargetClass = false)
		@ConditionalOnProperty(prefix = "spring.aop", name = "proxy-target-class", havingValue = "false",
				matchIfMissing = false)
		static class JdkDynamicAutoProxyConfiguration {

		}

		@Configuration(proxyBeanMethods = false)
		@EnableAspectJAutoProxy(proxyTargetClass = true)
		@ConditionalOnProperty(prefix = "spring.aop", name = "proxy-target-class", havingValue = "true",
				matchIfMissing = true)
		static class CglibAutoProxyConfiguration {

		}

	}

@Configuration 说明这是一个配置类；

@ConditionalOnClass(Advice.class) 类路径中是否存在 Advice.class 这个类；

取自“https://www.jihongchang.top/index.php?title=Spring_Boot_2_自动配置流程&oldid=6262”