【Java】自定义注解，通过BeanPostProcessor实现

springboot中实现自定义注解

annotation 注解

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@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD})
@Documented
@Inherited
public @interface Log {
    String description() default "";
}

aspect 解释器

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@Component
@Aspect
public class LogAspect implements BeanPostProcessor {
    @Override
    public Object postProcessAfterInitialization(Object bean, String beanName)
     throws BeansException {
        ReflectionUtils.doWithFields(bean.getClass(), field -> {
            ReflectionUtils.makeAccessible(field);
            // 查找是否有Log.class类型的注解
            if (null != field.getAnnotation(Log.class)){
                final Logger log = LoggerFactory.getLogger(bean.getClass());
                field.set(bean,log);
            }
        });
        return bean;
    }
}