some notes about spring aop

Posted 2020-08-22 Moriatry

1 . 

timeCountIntecetor implements handlerInterceptor {
     preHandle(); postHandle(); afterComplete();
}

 

 

 2 . 动态代理 by implement InvocationHandler (对接口)

class MyProxy implements InvocationHandler
{
    Object obj;
    public Object bind(Object obj)
    {
        this.obj = obj;
        return Proxy.newProxyInstance(obj.getClass().getClassLoader(), obj
                .getClass().getInterfaces(), this);
    }
    @Override
    public Object invoke(Object proxy, Method method, Object[] args)
            throws Throwable
    {
        System.out.println("I‘m proxy!");
        Object res = method.invoke(obj, args);
        return res;
    }
}
 
public class DynamicProxy
{
    public static void main(String[] args)
    {
        MyProxy myproxy = new MyProxy();
        HoseeDynamicimpl dynamicimpl = new HoseeDynamicimpl();
        HoseeDynamic proxy = (HoseeDynamic)myproxy.bind(dynamicimpl);
        System.out.println(proxy.sayhi());
    }
}

　　

 

 3 . 对类：

@Aspect

ServiceTimeCountAspect:

 

 

@Pointcut("execution(* me.ele.jarch.aries.service.*.*(..))")
    private void serviceMethod() {
    }
 
//  @Around("me.ele.jarch.aries.aspect.ServiceTimeCountAspect.serviceMethod()")
//    @Around("serviceMethod() || repositoryMethod()")
    @Around("serviceMethod()")
    public Object logServiceMethodRunningTime(ProceedingJoinPoint pjp)
            throws Throwable {
        // start stopwatch
        StopWatch watch = new StopWatch();
        watch.start();
 
        Object retVal = pjp.proceed();
 
        // stop stopwatch
        watch.stop();
        Long time = watch.getTotalTimeMillis();
        String methodName = pjp.getSignature().getName();
 
        logger.info("service method: {} time count : {}", methodName, time);
 
        return retVal;
    }

 

Spring AOP 会动态选择使用 JDK 动态代理、CGLIB 来生成 AOP 代理，如果目标类实现了接口，Spring AOP 则无需 CGLIB 的支持，直接使用 JDK 提供的 Proxy 和 InvocationHandler 来生成 AOP 代理即可。