AOP切面aspect执行方法前或后调用

package com.leave.aspect;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.core.LocalVariableTableParameterNameDiscoverer;
import org.springframework.stereotype.Component;
import java.lang.reflect.Method;


@Aspect   //切面容器
@Component //把类加入到容器中
public class AspectAOP {
    


    // 匹配AspectController类下面的所有共有方法。
    // 第一个* 代表任意返回值
    // 第二个* 当表任意方法
    //(..) 代表任意参数
    @Pointcut("execution(public * com.leave.aspect.AspectController.*(..))")
    public void log(){
        System.out.println("不进入 log()");
    }


    @Before("log()")
    public void before(JoinPoint joinPoint){
        Object[] args = joinPoint.getArgs();
        LocalVariableTableParameterNameDiscoverer u = new LocalVariableTableParameterNameDiscoverer();
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        Method method = signature.getMethod();
        String[] paramNames = u.getParameterNames(method);
        if (args != null && paramNames != null) {
            String params = "";
            for (int i = 0; i < args.length; i++) {
                params += "  " + paramNames[i] + "=" + args[i];
            }
            System.out.println("入参:" + params);
        }

        String declaringTypeName = joinPoint.getSignature().getDeclaringTypeName();
        System.out.println("类名:" + declaringTypeName);
        String methodName = joinPoint.getSignature().getName();
        System.out.println("方法名:" + methodName);
    }

    @After("log()")
    public void after(JoinPoint joinPoint){
        System.out.println("执行注解注释的方法后执行此方法");
    }


}