1、原始对象

UserServiceImpl.java

package com.yusian.service;

import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService{

    @Override
    public void login() {
        System.out.println("UserServiceImpl.login");
    }
}

2、切面类

注意事项：

• @Aspect定义当前类为切面类
• @Around定义当前方法为代理方法
• @Component使Spring自动创建当前类的实例对象

MyAspect.java

package com.yusian.aspect;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.springframework.stereotype.Component;

@Aspect
@Component
public class MyAspect {

    @Around("execution(* *(..))")
    public Object around(ProceedingJoinPoint joinPoint) throws Throwable{
        System.out.println("before....");
        Object ret = joinPoint.proceed();
        System.out.println("after.....");
        return ret;
    }
}

3、配置类

注意事项：

• @Configuration定义当前类为Spring的配置类
• @EnableAspectJAutoProxy开启Aop自动动态代理
• @ComponentScan扫描自动加载的bean对象

AppConfig.java

package com.yusian.config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.EnableAspectJAutoProxy;

@Configuration
@EnableAspectJAutoProxy
@ComponentScan({"com.yusian.service", "com.yusian.aspect"})
public class AppConfig {
}

4、测试

@Test
public void aopTest() {
    ApplicationContext ctx = new AnnotationConfigApplicationContext(AppConfig.class);
    UserService userService = (UserService) ctx.getBean("userServiceImpl");
    userService.login();
}

执行结果：

before....
UserServiceImpl.login
after.....

Process finished with exit code 0