直接看代码：

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

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()));    }}

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);    }}