22Spring基于配置文件的方式配置AOP

package com.cn.spring.aop.impl;

//加减乘除的接口类
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 com.cn.spring.aop.impl;

//实现类
public class ArithmeticCalculatorImpl implements ArithmeticCalculator {

    @Override
    public int add(int i, int j) {
        int result = i + j;
        return result;
    }

    @Override
    public int sub(int i, int j) {
        int result = i - j;
        return result;
    }

    @Override
    public int mul(int i, int j) {
        int result = i * j;
        return result;
    }

    @Override
    public int div(int i, int j) {
        int result = i / j;
        return result;
    }
}

package com.cn.spring.aop.impl;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;

import java.util.Arrays;
import java.util.List;


public class LoggingAspect {

    public void declareJoinPointExpression() {}


    public void beforeMethod(JoinPoint joinPoint) {
        String methodName = joinPoint.getSignature().getName();
        List<Object> args = Arrays.asList(joinPoint.getArgs());

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

    public void afterMethod(JoinPoint joinPoint) {
        String methodName = joinPoint.getSignature().getName();
        List<Object> args = Arrays.asList(joinPoint.getArgs());

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

    public void afterReturning(JoinPoint joinPoint, Object result) {
        String methodName = joinPoint.getSignature().getName();
        List<Object> args = Arrays.asList(joinPoint.getArgs());

        System.out.println("The method  ends witd " + result);
    }


    public void afterThrowing(JoinPoint joinPoint, Exception ex) {
        String methodName = joinPoint.getSignature().getName();

        System.out.println("The method " +  methodName + " occures exception with: " + ex);
    }


    public Object aroundMethod(ProceedingJoinPoint proceedingJoinPoint) {
        Object result = null;
        String methodName = proceedingJoinPoint.getSignature().getName();
        //执行目标方法
        try {
            //前置通知
            System.out.println("The method " +  methodName + " begins with " + Arrays.asList(proceedingJoinPoint.getArgs()));
            result = proceedingJoinPoint.proceed();
            //返回通知
            System.out.println("The method ends with " + result);
        } catch (Throwable throwable) {
            //异常通知
            System.out.println("The method " +  methodName + " occures exception with: " + throwable);
            throw new RuntimeException(throwable);
        }
        //后置通知
        System.out.println("The method " +  methodName + " ends");
        return result;
    }
}

package com.cn.spring.aop.impl;

import org.aspectj.lang.JoinPoint;

import java.util.Arrays;

public class ValidationAspect {

    public void validateArgs(JoinPoint joinPoint) {
        System.out.println("validate:" + Arrays.asList(joinPoint.getArgs()));
    }
}

<?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.xsd
       http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
    <context:component-scan base-package="com.cn.spring.aop.impl">
    </context:component-scan>

    <!--配置bean-->
    <bean class="com.cn.spring.aop.impl.ArithmeticCalculatorImpl"></bean>

    <!--配置切面的bean-->
    <bean id="loggingAspect" class="com.cn.spring.aop.impl.LoggingAspect"></bean>
    <bean id="validationAspect" class="com.cn.spring.aop.impl.ValidationAspect"></bean>

    <!--配置AOP-->
    <aop:config>
        <!--配置切点表达式-->
        <aop:pointcut id="pointcut" expression="execution(* com.cn.spring.aop.impl.ArithmeticCalculator.*(..))"></aop:pointcut>
        <!--配置切面及通知-->
        <aop:aspect ref="loggingAspect" order="2">
            <aop:before method="beforeMethod" pointcut-ref="pointcut"></aop:before>
            <aop:after method="afterMethod" pointcut-ref="pointcut"></aop:after>
            <aop:after-throwing method="afterThrowing" pointcut-ref="pointcut" throwing="ex"></aop:after-throwing>
            <aop:after-returning method="afterReturning" pointcut-ref="pointcut" returning="result"></aop:after-returning>

            <!--环绕通知-->
            <aop:around method="aroundMethod" pointcut-ref="pointcut"></aop:around>
        </aop:aspect>
        <aop:aspect ref="validationAspect" order="1">
            <aop:before pointcut-ref="pointcut" method="validateArgs"></aop:before>
        </aop:aspect>
    </aop:config>
    <!--使AspjectJ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 com.cn.spring.aop.impl;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Main {
    public static void main(String[] args) {
        //1.创建Spring的IOC容器
        ApplicationContext ctx = new ClassPathXmlApplicationContext("22-1.xml");

        //2.从IOC容器中huo获取bean的实例
        ArithmeticCalculator arithmeticCalculator = ctx.getBean(ArithmeticCalculator.class);
        //3.使用bean
        int result = arithmeticCalculator.add(3, 6);
        System.out.println("result:" + result);
        //result = arithmeticCalculator.div(3, 0);
       // System.out.println("result:" + result);
    }
}