AOP注解开发

目录

创建切面类并配置

@Aspect定义为切面类

@Before:前置通知

@AfterReturning：后置通知

@Around：环绕通知

@AfterThrowing：异常通知

@After：最终通知

切入点配置

创建目标类并配置

创建切面类并配置

<!--开启aop注解开发-->
<aop:aspectj-autoproxy/>
<!--配置目标类-->
<bean id="dao" class="com.aop.zhujie.Dao"/>
<!--配置切面类-->
<bean id="aspect" class="com.aop.zhujie.MyAspect"/>
           

@Aspect定义为切面类

@Aspect
public class MyAspect 
           

@Before:前置通知

@Before(value = "execution(* com.aop.zhujie.Dao.ff(..))")
public void before(){
    System.out.println("前置增强");
}
           

@AfterReturning：后置通知

@AfterReturning(value = "execution(* com.aop.zhujie.Dao.hh(..))",returning ="result")
public void after(Object result){
    System.out.println("后置增强"+result);
}
           

@Around：环绕通知

@Around(value = "execution(* com.aop.zhujie.Dao.huanrao(..))")
public Object around(ProceedingJoinPoint joinPoint) throws Throwable {
    System.out.println("环绕前通知");
    Object proceed = joinPoint.proceed();//加入原本的方法
    System.out.println("环绕后通知");
    return proceed;
}
           

@AfterThrowing：异常通知

@AfterThrowing(value = "execution(* com.aop.zhujie.Dao.ec(..))",throwing = "throwable")
public void ec(Throwable throwable){
    System.out.println("异常通知"+throwable.getMessage());
}
           

@After：最终通知

：与后置通知的区别

他们俩都会放到目标方法的后面去执行，但是遇到异常，最终通知任然会执行

@After(value = "execution(* com.aop.zhujie.Dao.ec(..))")
public void zuizhong(){
    System.out.println("最终通知");
}
           

切入点配置

//切入点注解
@Pointcut(value ="execution(* com.aop.zhujie.Dao.ec(..))")
public void Pointcut1(){};
           

应用：
           

@AfterThrowing(value = "MyAspect.Pointcut1()",throwing = "throwable")
public void ec(Throwable throwable){
    System.out.println("异常通知"+throwable.getMessage());
}
@After(value = "MyAspect.Pointcut1()")
public void zuizhong(){
    System.out.println("最终通知");
}