Spring boot 结合aop,自定义注解，切面的理解

package com.imooc.boot.controller;


import com.imooc.boot.aspect.IndexAspect;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("member")
public class MemberController {

    @IndexAspect
    @RequestMapping(value = "/index",method = RequestMethod.GET)
    public  String  index(){
        System.out.println("aspect test after");
        return "SUCCESS";
    }
}



package com.imooc.boot.aspect;

import java.lang.annotation.*;

/**
 * 自定义的注解
 */
@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface IndexAspect {
}




package com.imooc.boot.aspect;

import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;

/**
 * 定义切面类
 */
@org.aspectj.lang.annotation.Aspect
@Component
public class Aspect {

    /**
     * 定义切点-->自定义注解
     */
    @Pointcut("@annotation(com.imooc.boot.aspect.IndexAspect)")
    public  void afterAsperct(){

    }

    /**
     * 具体在切点前面前或者后需要执行的流程，
     * 在此只写了在切点前执行
     * -->切点后执行的话 @After 相关的注解,
     */
    @Before("afterAsperct()")
    public void before(){
        System.out.println("切面前执行-->");
    }


}