package spring.aop.impl;

public interface ArithmeticCalculator {

    int add(int i,int j);

    int sub(int i,int j);

    int mul(int i,int j);

    int div(int i,int j);

}

package spring.aop.impl;

import org.springframework.stereotype.Component;

@Component("arithmeticCalculator")

public class ArithmeticCalculatorImpl implements ArithmeticCalculator {

    public int add(int i, int j) {

        int result = i+j;

        return result;

    }

    public int sub(int i, int j) {

        int result = i-j;

        return result;

    }

    public int mul(int i, int j) {

        int result = i*j;

        return result;

    }

    public int div(int i, int j) {

        int result = i/j;

        return result;

    }

}

package spring.aop.impl;

import java.util.Arrays;

import java.util.List;

import org.aspectj.lang.JoinPoint;

import org.aspectj.lang.annotation.After;

import org.aspectj.lang.annotation.Aspect;

import org.aspectj.lang.annotation.Before;

import org.springframework.stereotype.Component;

//把这个类声明为一个切面：1.把该类放入到IOC容器中，2.再声明一个切面

@Aspect

@Component

public class LoggingAspect {

    //声明该方法是一个前置通知：在目标方法之前执行

    @Before("execution( public int spring.aop.impl.*.*(int,int) )")

    public void beforeMethod(JoinPoint joinPoint){

        String methodName=joinPoint.getSignature().getName();

        List<Object> args=Arrays.asList(joinPoint.getArgs());

        System.out.println("The method "+methodName+" begins"+args);

    }

    //后置通知：在目标方法执行后执行（无论是否发生异常），的通知。

    //在后置通知中不能访问目标方法的执行结果

    @After("execution( public int spring.aop.impl.*.*(int,int) )")

    public void afterMethod(JoinPoint joinPoint){

        String methodName=joinPoint.getSignature().getName();

        System.out.println("The method "+methodName+" ends");

    }

}

<?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:context="http://www.springframework.org/schema/context"

    xmlns:aop="http://www.springframework.org/schema/aop"

    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd

        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd

        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.3.xsd">

    <!-- 配置自动扫描的包 -->

    <context:component-scan base-package="spring.aop.impl" />

    <!-- 使AspectJ注解起作用，自动为匹配的类生成代理对象 -->

    <aop:aspectj-autoproxy></aop:aspectj-autoproxy>

</beans>

package spring.aop.impl.test;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import spring.aop.impl.ArithmeticCalculator;

public class Main {

    public static void main(String[] args) {

        //1.创建spring的IOC容器

        ApplicationContext ctx=new ClassPathXmlApplicationContext("applicationContext.xml");

        //2.从容器中获取bean的实例

        ArithmeticCalculator arithmeticCalculator=(ArithmeticCalculator) ctx.getBean("arithmeticCalculator");

        //3.使用bean

        int result = arithmeticCalculator.add(5, 8);

        System.out.println("result:"+result);

        result = arithmeticCalculator.div(5, 8);

        System.out.println("result:"+result);

    }

}

The method add begins[5, 8]

The method add ends

result:13

The method div begins[5, 8]

The method div ends

result:0