spring AOP之基于xml配置文件的方式来配置AOP

Calculator.java

package com.gong.spring.aop.impl;

public interface Calculator {
    int add(int i, int j);
    int sub(int i, int j);
    int mul(int i, int j);
    int div(int i, int j);
}

CalculatorImpl.java

package com.gong.spring.aop.impl2;

public class CalculatorImpl implements Calculator{

    @Override
    public int add(int i, int j) {
        // TODO Auto-generated method stub
        int result =  i+j;
        return result;
    }

    @Override
    public int sub(int i, int j) {
        // TODO Auto-generated method stub
        int result = i - j;
        return result;
    }

    @Override
    public int mul(int i, int j) {
        // TODO Auto-generated method stub
        int result = i * j;
        return result;
    }

    @Override
    public int div(int i, int j) {
        // TODO Auto-generated method stub
        int result = i / j;
        return result;
    }

}

LoggingAspect.java

package com.gong.spring.aop.impl2;

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

import javax.management.RuntimeErrorException;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.AfterReturning;
import org.aspectj.lang.annotation.AfterThrowing;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;


public class LoggingAspect {
    
    public void beforeMethod(JoinPoint joinPoint) {
        String methodName = joinPoint.getSignature().getName();
        List<Object> args = Arrays.asList(joinPoint.getArgs());
        System.out.println(methodName+" begin with "+args);
    }
    
    public void afterMethod(JoinPoint joinPoint) {
        //获取名字
        String methodName = joinPoint.getSignature().getName();
        //获取参数
        List<Object> args = Arrays.asList(joinPoint.getArgs());
        System.out.println(methodName+" end with "+args);
    }

    public void afterReturning(JoinPoint joinPoint,Object result) {
        String methodName = joinPoint.getSignature().getName();
        List<Object> args = Arrays.asList(joinPoint.getArgs());
        System.out.println("在afterReturning得到返回值："+ result);
        System.out.println(methodName+" end with "+args);
    }

    public void afterThrowing(JoinPoint joinPoint,Exception ex) {
        String methodName = joinPoint.getSignature().getName();
        System.out.println(methodName+" occurs exception:"+ex);
    }
    
    public Object aroundMethod(ProceedingJoinPoint pjd) {
        Object result = null;
        String methodName = pjd.getSignature().getName();
        //执行目标方法
        try {
            //前置通知
            System.out.println(methodName+" begin with "+Arrays.asList(pjd.getArgs()));
            //执行目标方法
            result = pjd.proceed();
            //后置通知
            System.out.println("在aroundMethod中得到值："+result);
        } catch (Throwable e) {
            // TODO Auto-generated catch block
            //异常通知
            System.out.println("the method occurs exception：" + e);
            throw new RuntimeException(e);
        }
        //后置通知
        System.out.println(methodName+" end with "+Arrays.asList(pjd.getArgs()));
        return result;
    }
}

applicationContext2.xml

<?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/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bean -->
    <bean id="calculator" class="com.gong.spring.aop.impl2.CalculatorImpl"></bean>
    <!-- 配置切面bean -->
    <bean id="loggingAspect" class="com.gong.spring.aop.impl2.LoggingAspect"></bean>
    <!-- 配置AOP -->
    <aop:config>
        <!-- 配置切点表达式 -->
        <aop:pointcut expression="execution(* com.gong.spring.aop.impl2.Calculator.*(int, int))" 
        id="pointcut"/>
        <!-- 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:aspect>
    </aop:config>
</beans>

需要注意的是：execution(* com.gong.spring.aop.impl2.Calculator.*(int, int))中额第一个*不要漏掉，否则会报错。

Main.java

package com.gong.spring.aop.impl2;

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

public class Main {
    public static void main(String[] args) {
        ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext2.xml");
        //从IOC容器中获取bean的实例
        Calculator calculator = (Calculator) ctx.getBean(Calculator.class);
        int res = calculator.add(2, 1);
        System.out.println("在主函数中加法计算的结果="+res);
        res = calculator.div(2, 1);
        System.out.println("在主函数中除法计算的结果="+res);
    }
}

输出：