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说到对类方法增强#xff0c;第一时间想到自定义注解#xff0c;通过aop切面进行实现。这是一种常用做法#xff0c;但是在某些场景下#xff0c;如开发公共组件#xff0c;定义aop切面可能不是最优方案。以后通过原生aop方式#xff0c;自定义注解#xff0c;对类…说明
说到对类方法增强第一时间想到自定义注解通过aop切面进行实现。这是一种常用做法但是在某些场景下如开发公共组件定义aop切面可能不是最优方案。以后通过原生aop方式自定义注解对类方法进行增强。
实现
自定义注解
Target(ElementType.METHOD)
Retention(RetentionPolicy.RUNTIME)
Documented
public interface CustomStat {
}
自定义切点
/*** 切点Pointcut按照规则匹配需要代理的方法*/
Slf4j
public class CustomPointcut extends StaticMethodMatcherPointcut implements ClassFilter {Overridepublic boolean matches(Class? clazz) {boolean contains clazz.getName().contains(com.spring.demo.service);if (contains) {log.info(CustomPointcut:{},clazz.getName());}return contains;}Overridepublic boolean matches(Method method, Class? targetClass) {boolean contains targetClass.getName().contains(com.spring.demo.service);if (contains) {log.info(CustomPointcut:{},targetClass.getName());}return contains;}
}
自定义增强器
public class CustomAnnotationAdvisor extends AbstractPointcutAdvisor implements BeanFactoryAware, Ordered {private Advice advice;private Pointcut pointcut;private MethodInterceptor methodInterceptor;public CustomAnnotationAdvisor(MethodInterceptor methodInterceptor) {this.methodInterceptor methodInterceptor;this.advice buildAdvice();this.pointcut buildPointcut();}Overridepublic Pointcut getPointcut() {return this.pointcut;}Overridepublic Advice getAdvice() {return this.advice;}Overridepublic void setBeanFactory(BeanFactory beanFactory) throws BeansException {if (this.advice instanceof BeanFactoryAware) {((BeanFactoryAware) this.advice).setBeanFactory(beanFactory);}}protected Advice buildAdvice() {return methodInterceptor;}protected Pointcut buildPointcut() {//构建切点Pointcut cpc new AnnotationMatchingPointcut(CustomStat.class, true);Pointcut mpc AnnotationMatchingPointcut.forMethodAnnotation(CustomStat.class);return new ComposablePointcut(cpc).union(mpc);}Overridepublic int getOrder() {return Integer.MAX_VALUE;}
}
其中构造参数中的MethodInterceptor为最终代理拦截器
自定义拦截器
Slf4j
Component
public class CustomAnnotationInterceptor implements MethodInterceptor {Overridepublic Object invoke(MethodInvocation invocation) throws Throwable {//调用的方法和参数//Method method invocation.getMethod();// Object[] arguments invocation.getArguments();log.info(start-注解aop拦截器);Object proceed invocation.proceed();log.info(end-注解aop拦截器);return proceed;}
}
注册增强器
Component
public class CustomAnnotationBeanPostProcessor extends AbstractAdvisingBeanPostProcessor implements BeanFactoryAware {Resourceprivate CustomAnnotationInterceptor customAnnotationInterceptor;Overridepublic void setBeanFactory(BeanFactory beanFactory) throws BeansException {setBeforeExistingAdvisors(true);CustomAnnotationAdvisor advisor new CustomAnnotationAdvisor(customAnnotationInterceptor);advisor.setBeanFactory(beanFactory);this.advisor advisor;}
}测试 OverrideCustomStatpublic void printWork() {System.out.println(WorkServiceImpl1);}结果
2024-05-21 08:55:26.486 INFO 41351 --- [nio-8081-exec-5] c.s.d.a.CustomAnnotationInterceptor : start-注解aop拦截器
WorkServiceImpl1
2024-05-21 08:55:26.486 INFO 41351 --- [nio-8081-exec-5] c.s.d.a.CustomAnnotationInterceptor : end-注解aop拦截器
