public interface ArithmeticCalculator {double plus(int i, int j);double sub(int i, int j);double multi(int i, int j);double div(int i, int j);
}

import org.springframework.stereotype.Component;@Component("arithmeticCalculator")
public class ArithmeticCalculatorImpl implements ArithmeticCalculator {public double plus(int i, int j) {double result = i + j;return result;}public double sub(int i, int j) {double result = i - j;return  result;}public double multi(int i, int j) {double result = i * j;return result;}public double div(int i, int j) {double result = i / j;return result;}
}

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.*;
import org.springframework.stereotype.Component;import java.util.Arrays;@Aspect
@Component
public class LoggingAspect {/*** 定义一个方法, 用于声明切入点表达式. 一般地, *该方法中再不需要添入其他的代码.* 使用 @Pointcut 来声明切入点表达式.* 后面的其他通知直接使用方法名来引用当前的切入点表达式.*/@Pointcut("execution(* com.spring2.lee.aop.impl.*.*(..))")public void declareJointPointExpression(){}/*** 前置通知* 在 com.atguigu.spring.aop.ArithmeticCalculator* 接口的每一个实现类的每一个方法开始之前执行一段代码* 用通配符*来表示所有*/
//    @Before("execution(public double com.spring2.lee.aop.impl.ArithmeticCalculator.plus(int, int))")@Before("declareJointPointExpression()")public void beforeMethod(JoinPoint joinPoint) {String methodName = joinPoint.getSignature().getName();Object[] args = joinPoint.getArgs();System.out.println("before method " + methodName + " begin with:" + Arrays.asList(args));}/*** 后置通知* 在方法执行之后执行的代码. 无论该方法是否出现异常* @param joinPoint*/@After("execution(public double com.spring2.lee.aop.impl.*.*(..))")public void afterMethod(JoinPoint joinPoint) {String methodName = joinPoint.getSignature().getName();Object[] args = joinPoint.getArgs();System.out.println("after method " + methodName + " end " + Arrays.asList(args));}/*** 返回通知* 在方法法正常结束受执行的代码* 返回通知是可以访问到方法的返回值的!*/@AfterReturning(value = "execution(public double com.spring2.lee.aop.impl.*.*(..))",returning = "result")public void afterReturning(JoinPoint joinPoint, Object result) {String methodName = joinPoint.getSignature().getName();System.out.println("The method " + methodName + " ends with " + result);}/*** 异常通知* 在目标方法出现异常时会执行的代码.* 可以访问到异常对象; 且可以指定在出现特定异常时在执行通知代码*/@AfterThrowing(value = "execution(public double com.spring2.lee.aop.impl.*.*(..))", throwing = "e")public void afterThrowing(JoinPoint joinPoint, Exception e) {String methodName = joinPoint.getSignature().getName();System.out.println("The method " + methodName + " occurs excetion:" + e);}/*** 环绕通知需要携带 ProceedingJoinPoint 类型的参数.* 环绕通知类似于动态代理的全过程: ProceedingJoinPoint 类型的参数可以决定是否执行目标方法.* 且环绕通知必须有返回值, 返回值即为目标方法的返回值*/@Around("execution(public double com.spring2.lee.aop.impl.*.*(..))")public Object aroundMethod(ProceedingJoinPoint pjd) {Object result = null;String methodName = pjd.getSignature().getName();try {//前置通知System.out.println("The method " + methodName + " begins with " + Arrays.asList(pjd.getArgs()));//执行目标方法result = pjd.proceed();//返回通知System.out.println("The method " + methodName + " ends with " + result);} catch (Throwable e) {//异常通知System.out.println("The method " + methodName + " occurs exception:" + e);throw new RuntimeException(e);}//后置通知System.out.println("The method " + methodName + " ends");return result;}}

<?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/beanshttp://www.springframework.org/schema/beans/spring-beans-3.0.xsdhttp://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop-3.0.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-3.0.xsddefault-autowire="byName" default-lazy-init="false"><!--自动为Spring容器中那些匹配@AspectJ切面的Bean创建代理，完成切面织入。proxy-target-class属性，默认是false,表示使用JDK动态代理技术织入增强。当设置为true时，表示使用CGLib动态代理技术织入增强。不过即使设置为false，如果目标类没有实现接口，则Spring将自动使用CGLib动态代理--><aop:aspectj-autoproxy proxy-target-class="false"/>
</beans>

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;public class MainTest {public static void main(String[] args) {//1.创建Spring 的IOC 容器ApplicationContext application = new ClassPathXmlApplicationContext("applicationContext.xml");//2. 从IOC 容器中获取bean 的实例ArithmeticCalculator arithmeticCalculator = application.getBean(ArithmeticCalculator.class);double result = arithmeticCalculator.div(2,2);//System.out.println("result:" + result);
    }
}

<?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.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd"><!-- 配置 bean --><bean id="arithmeticCalculator"class="com.spring2.lee.aop.impl.ArithmeticCalculatorImpl"></bean><!-- 配置切面的 bean. --><bean id="loggingAspect"class="com.spring2.lee.aop.impl.LoggingAspect"></bean><bean id="vlidationAspect"class="com.spring2.lee.aop.impl.VlidationAspect"></bean><!-- 配置 AOP --><aop:config><!-- 配置切点表达式 --><aop:pointcut id="pointcut" expression="execution(* com.spring2.lee.aop.impl.ArithmeticCalculator.*(int, int))"/><!-- 配置切面及通知 --><aop:aspect ref="loggingAspect" order="2"><aop:before method="beforeMethod" pointcut-ref="pointcut"/><aop:after method="afterMethod" pointcut-ref="pointcut"/><aop:after-throwing method="afterThrowing" pointcut-ref="pointcut" throwing="e"/><aop:after-returning method="afterReturning" pointcut-ref="pointcut" returning="result"/><!--<aop:around method="aroundMethod" pointcut-ref="pointcut"/>--></aop:aspect><aop:aspect ref="vlidationAspect" order="1"><aop:before method="validateArgs" pointcut-ref="pointcut"/></aop:aspect></aop:config></beans>