十五 Spring的AOP的注解的通知类型，切入点的注解

Spring的注解的AOP的通知类型

• @Before：前置通知
• @AfterReturning：后置通知
• @Around：环绕通知
• @AfterThrowing：异常抛出通知
• @After:最终通知
• @Pointcut：切入点的注解

 /**
  * 切面类：注解的切面类
  */
 @Aspect
 public class MyAspectAnno {
     //前置通知
     @Before(value="execution(* com.itheima.spring.demo1.OrderDao.save(..) )")
     public void before(){
        System.out.println("前置通知======");
    }
   //后置通知
     @AfterReturning(value="execution(* com.itheima.spring.demo1.OrderDao.delete(..))", returning="result")
     public void afterReturning(Object result){
         System.out.println("后置通知====="+result);
     }
     @Around(value="execution(* com.itheima.spring.demo1.OrderDao.update(..))")
     public Object around(ProceedingJoinPoint joinPoint) throws Throwable{
         System.out.println("环绕前增强=====");
         Object obj = joinPoint.proceed();
         System.out.println("环绕后增强=====");
         return obj;
     }
     //异常抛出通知
     @AfterThrowing(value="execution(* com.itheima.spring.demo1.OrderDao.find(..))" , throwing="e")
     public void find(Throwable e ){
        System.out.println("异常抛出通知======"+e.getMessage());
    }
    //最终通知：
     @After(value="execution(* com.itheima.spring.demo1.OrderDao.find(..))")
     public void after( ){
        System.out.println("最终通知======");
    }
 }

切入点的注解：

配置@Pointcut注解，使用类名.方法

/**
 * 切面类：注解的切面类
 */
@Aspect
public class MyAspectAnno {
    //切入点的注解
    @Pointcut(value="execution(* com.itheima.spring.demo1.OrderDao.find(..))")
    private void pointcut1(){}

    @Pointcut(value="execution(* com.itheima.spring.demo1.OrderDao.save(..))")
    private void pointcut2(){}

    @Pointcut(value="execution(* com.itheima.spring.demo1.OrderDao.update(..))")
    private void pointcut3(){}

    @Pointcut(value="execution(* com.itheima.spring.demo1.OrderDao.delete(..))")
    private void pointcut4(){}

    //前置通知
    @Before(value="MyAspectAnno.pointcut2()")
    public void before(){
       System.out.println("前置通知======");
   }
  //后置通知
    @AfterReturning(value="MyAspectAnno.pointcut4()", returning="result")
    public void afterReturning(Object result){
        System.out.println("后置通知====="+result);
    }
 //环绕通知
    @Around(value="MyAspectAnno.pointcut3()")
    public Object around(ProceedingJoinPoint joinPoint) throws Throwable{
        System.out.println("环绕前增强=====");
        Object obj = joinPoint.proceed();
        System.out.println("环绕后增强=====");
        return obj;
    }
    //异常抛出通知
    @AfterThrowing(value="MyAspectAnno.pointcut1()" , throwing="e")
    public void find(Throwable e ){
       System.out.println("异常抛出通知======"+e.getMessage());
   }

  // 最终通知：
    @After(value="MyAspectAnno.pointcut1()")
    public void after( ){
       System.out.println("最终通知======");
   }

}