Spring AOP的基于AspectJ注解开发

一.Spring的AOP的注解开发详细过程

1.编写目标类并配置

这个目标类并没有实现接口,因此spring会自动用Cglib来对其进行动态代理

public class OrderDao {
     void add(){
        System.out.println("add...");
    }
     void delete(){
        System.out.println("delete...");
    }
     void update(){
        System.out.println("update...");
    }
    void find(){
        System.out.println("find...");
    }

}

<!--配置目标类-->
	<bean id="OrderDao" class="org.qingyu.dao.OrderDao"></bean>

 

2.编写切面类并配置

//切面类
public class MyAspect {

    public void before(){
        System.out.println("前置通知...");
    }
}

<!--配置切面类-->
	<bean id="MyAspect" class="org.qingyu.aspect.MyAspect"></bean>

3.使用注解对目标类进行增强

//切面类
@Aspect
public class MyAspect {

    @Before(value = "execution(* org.qingyu.dao.OrderDao.add(..))")
    public void before(){
        System.out.println("前置通知...");
    }
}

4.编写测试类

public static void main(String[] args){
        ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring.xml");
        OrderDao orderDao = (OrderDao) applicationContext.getBean("OrderDao");
        orderDao.add();
    }

输出结果如下:

前置通知...
add...

 

二.Spring的AOP的注解的通知类型

[email protected]  前置通知

 

@Before(value = "execution(* org.qingyu.dao.OrderDao.add(..))")
    public void before(){
        System.out.println("前置通知...");
    }

[email protected]     后置通知

@AfterReturning(value = "execution(* org.qingyu.dao.OrderDao.delete(..))" ,returning = "result")
    public void afterReturning(Object result){
        System.out.println("后置通知..."+result);
    }

 

[email protected]   环绕通知

 @Around(value = "execution(* org.qingyu.dao.OrderDao.find(..))")
    public Object around(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
        System.out.println("环绕前...");
        Object obj = proceedingJoinPoint.proceed();
        System.out.println("环绕后...");
        return obj;
    }

[email protected]   异常抛出通知

 @AfterThrowing(value = "execution(* org.qingyu.dao.OrderDao.update(..))",throwing = "e")
    public void afterThrowing(Throwable e){
        System.out.println("异常抛出通知..."+e.getMessage());
    }

 

三.Spring的注解的AOP的切入点的配置

@After(value = "MyAspect.pointCut1()")
    public void after(){
        System.out.println("最终通知...");
    }

    @Pointcut(value = "execution(* org.qingyu.dao.OrderDao.update(..))")
    private void pointCut1(){}