spring Aop 中 Advice, advisor和Advised关系

spring Aop 中 Advice,PointCut, Advisor和Advised关系

Advice: 增强, 如BeforeAdvice, AfterAdvice...
Advisor表示增强定义，由 Advice和PointCut组成
Advised 管理 Advisor

使用 spring Aop 定义增强

使用 spring Aop 定义增强,而不是用 AspectJ

java 复制代码

@Slf4j
public class LogAdvice implements MethodBeforeAdvice {

    @Override
    public void before(Method method, Object[] args, Object target) throws Throwable {
        log.info("before method: {}", method.getName());
    }
}

@Configuration
public class SpringAopConfig {

    @Bean
    public LogAdvice logAdvice() {
        return new LogAdvice();
    }

    @Bean
    public Advisor logAdvisor() {
        NameMatchMethodPointcut nameMatchMethodPointcut = new NameMatchMethodPointcut();
        nameMatchMethodPointcut.addMethodName("ping");
        return new DefaultPointcutAdvisor(nameMatchMethodPointcut, logAdvice());
    }
}

结果:

bash 复制代码

INFO 104836 --- [nio-8080-exec-3] com.proxy.sample.LogAdvice   : before method: ping

使用 AspectJ 实现AOP

java 复制代码

@Component
@Aspect
@Slf4j
public class LogAspect {

    @Pointcut("execution(* com.controller.HealthController.*(..))")
    public void pc() {
    }

    @Before("pc()")
    public void log(JoinPoint joinPoint) {
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        log.info("before method: {}", signature.getName());
    }
}

结果:

bash 复制代码

INFO 96524 --- [nio-8080-exec-1] com.proxy.sample.LogAspect   : before method: ping

AspectJ 和 Spring Aop区别

都可以实现AOP 增强
AspectJ是在编译期
Spring Aop则是运行时，动态创建，性能要稍微差点
AspectJ 使用范围更广，不依赖spring, 而spring Aop则与spring 绑定