SpringBoot中创建的AOP不生效的原因及解决

package com.example.demo.inter;
public interface CustomerService {
     void doSomething1();
     void doSomething2();
}

package com.example.demo.inter;
import org.springframework.aop.framework.AopContext;
import org.springframework.stereotype.Service;
@Service
public class CustomerServiceImpl implements CustomerService {
    @Override
    public void doSomething1() {
        System.out.println("CustomerServiceImpl.doSomething1()");
        doSomething2();
        ((CustomerService) AopContext.currentProxy()).doSomething2();
    }
    @Override
    public void doSomething2() {
        System.out.println("CustomerServiceImpl.doSomething2()");
    }
}

package com.example.demo;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.stereotype.Component;
@Component
@Aspect
public class CustomerServiceInterceptor {
    @Before("execution(* com.example.demo.inter..*.*(..))")
    public void doBefore() {
        System.out.println("do some important things before...");
    }
}

package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.EnableAspectJAutoProxy;
@EnableAspectJAutoProxy(proxyTargetClass=true, exposeProxy=true)
@SpringBootApplication
public class DemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}

package com.example.demo;
import com.example.demo.inter.CustomerService;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
@SpringBootTest
class DemoApplicationTests {
    @Autowired
    CustomerService customerService;
    @Test
    public void testAOP() {
        customerService.doSomething1();
    }
    @Test
    void contextLoads() {
    }
}

package com.example.demo;
import com.example.demo.inter.CustomerService;
public class CustomerServiceProxy implements CustomerService {
    private CustomerService customerService;
    public void setCustomerService(CustomerService customerService) {
        this.customerService = customerService;
    }
    public void doSomething1() {
        doBefore();
        customerService.doSomething1();
        // 默认，所以不会执行doBefore
        customerService.doSomething2();
        // 加入 AopContext.currentProxy的效果，完成切面效果
        this.doSomething2();
    }
    public void doSomething2() {
        doBefore();
        customerService.doSomething2();
    }
    private void doBefore() {
        System.out.println("do some important things before...");
    }
}