Spring AOP入门

Spring AOP入门

1.导入坐标

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.2.10.RELEASE</version>
<!--            <scope>compile</scope>-->
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.9.4</version>
        </dependency>

2.设置spring配置类

@Configuration
@ComponentScan("com_spring_aop")
//使用注解开发aop
@EnableAspectJAutoProxy
public class springConfig {
}

3.userDao接口和userDaoImp接口实现类

public interface userDao {
    abstract public void add();
}

@Repository
public class userDaoImp implements userDao{

    public void add(){
        System.out.println("add......");
    }
}

4.编写aop通知类

设置空的方法作为切入点

//声明作为注解的spring控件
@Component

//声明作为aop
@Aspect
public class aop_Class_01 {
//    切入点
    @Pointcut("execution(void com_spring_aop.dao.userDao.add())")
    private void fn(){}

//    前置通知
    @Before("fn()")
    public void method(){
        System.out.println(System.currentTimeMillis());
    }

//    环绕通知
    @Around("fn()")
    public void around(ProceedingJoinPoint joinPoint)throws Throwable{
        System.out.println("执行前......");

//        固定写法，表示原方法执行
        joinPoint.proceed();

        System.out.println("执行后......");
    }
}

5.测试类

ApplicationContext context = new AnnotationConfigApplicationContext(springConfig.class);

userDao userDao = context.getBean(userDao.class);
userDao.add();