Spring-AOP学习笔记-04 注解配置

Posted 2021-07-14 Moon&&Dragon

6 基于注解的AOP配置

6.1 XML配置

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/aop
       http://www.springframework.org/schema/aop/spring-aop.xsd
 http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd">

    <!--需要被代理的类-->
    <bean id="Man" class="com.moon.point.Man"/>
    
    <!--开启组件扫描-->
    <context:component-scan base-package="com.moon"/>
    <!--开启aop注解模式-->
    <aop:aspectj-autoproxy/>
</beans>

6.2 前后置通知

使用java类来配置一个切面

// 加入组件，交给ioc管理
@Component
// 声明是一个切面类
@Aspect
public class AnnotationAspect {
    /**
     * 配置切入点
     */
    @Pointcut("execution(* com.moon.point.Man.*(..))")
    private void pointCut(){}

    /**
     * 前置通知，将前面配置的切入点引入
     */
    @Before("pointCut()")
    public void beforeAdvice(){
        System.out.println("This is beforeAdvice!");
    }

    /**
     * 后置通知，将前面配置的切入点引入
     */
    @After("pointCut()")
    public void afterAdvice(){
        System.out.println("This is afterAdvice!");
    }

    /**
     * 后置返回通知，可以指定返回的参数的接收值
     * @param result 返回参数接收
     */
    @AfterReturning(value = "pointCut()",returning = "result")
    public void afterReturning(Object result){
        System.out.println("This is afterReturning! Result is "+result);
    }
    /**
     * 后置异常通知，可以指定异常参数的接收
     * @param e 异常接收
     */
    @AfterThrowing(value = "pointCut()",throwing = "e")
    public void afterThrowing(Exception e){
        System.out.println("This is afterReturning! Exception is "+e.getMessage());
    }
}

结果：

6.3 环绕通知

// 加入组件，交给ioc管理
@Component
// 声明是一个切面类
@Aspect
public class AnnotationAspect {
    /**
     * 配置切入点
     */
    @Pointcut("execution(* com.moon.point.Man.*(..))")
    private void pointCut(){}

    /**
     * 环绕通知配置，引入切点
     * @param point 连接点
     * @return 执行后返回值
     * @throws Throwable 方法执行异常
     */
    @Around("pointCut()")
     @Around("pointCut()")
    public Object aroundAdvice(ProceedingJoinPoint point) throws Throwable {
        try {
            // 前置通知
            System.out.println("This is around-beforeAdvice");
            // 执行方法，拿到返回值
            Object proceed = point.proceed();
            // 后置返回值方法
            System.out.println("This is around-afterReturningAdvice! result is " + proceed);
            return proceed;
        } catch (Throwable e) {
            // 后置异常方法
            System.out.println("This is around-afterThrowingAdvice! Exception Message is " + e.getMessage());
            throw e;
        } finally {
            // 后置finally方法
            System.out.println("This is around-afterFinallyAdvice!");
        }
    }
}

结果：