例子程式

基本結構

ArithmeticCalculator.java

package com.spring.aop.xml;

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);


}

ArithmeticCalculatorImpl.java

package com.spring.aop.xml;

import
 
 com.spring.aop.ArithmeticCalculator;

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;
    }
}

LoggingAspect.java

package com.spring.aop.xml;

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


import java.util.Arrays;


public class LoggingAspect {


    public void beforeMethod(JoinPoint joinPoint){
        String methodName = joinPoint.getSignature().getName();
        Object[] args = joinPoint.getArgs();

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


    public void afterMethod(JoinPoint joinPoint){

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

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


    public void afterReturning(JoinPoint joinPoint,Object result){

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

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



    public void afterThrowing(JoinPoint joinPoint,Exception e){
        String methodName = joinPoint.getSignature().getName();
        System.out.println("The method "+methodName+" occurs exception "+ e);
    }

    @Around("execution(public int com.atguigu.spring.aop.ArithmeticCalculator.*(..))")
    public Object aroundMethod(ProceedingJoinPoint pjd){

        Object result = null;
        String methodName = pjd.getSignature().getName();

        //執行目標方法
        try{
            //前置通知
            System.out.println("環繞The method "+methodName+" begins with "+Arrays.asList(pjd.getArgs()));
            result = pjd.proceed();
            //返回通知
            System.out.println("環繞The method "+methodName+" ends with "+result);
        }catch (Throwable e){
            //異常通知
            System.out.println("環繞The method "+methodName+" occurs exception:" + e);
            throw new RuntimeException(e);
        }
        //後置通知
        System.out.println("環繞The method  "+methodName+" ends");
        return result;
    }
}

VlidationAspect.java

package com.spring.aop.xml;

import org.aspectj.lang.JoinPoint;

import java.util.Arrays;


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

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

    <!--配置bean-->
    <bean id="arithmeticCalculator"
          class="com.spring.aop.xml.ArithmeticCalculatorImpl"></bean>

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

    <bean id="vlidationAspect"
          class="com.spring.aop.xml.VlidationAspect"></bean>

    <!--配置AOP-->
    <aop:config proxy-target-class="false">
        <!--配置切點表示式-->
        <aop:pointcut  expression="execution(* com.spring.aop.xml.ArithmeticCalculatorImpl.*(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: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>

Main.java

package com.spring.aop.xml;

import com.spring.aop.ArithmeticCalculator;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Main {

    public static void main(String[] args){

        ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext-xml.xml");
        ArithmeticCalculator arithmeticCalculator = (ArithmeticCalculator) ctx.getBean("arithmeticCalculator");

        System.out.println(arithmeticCalculator.getClass().getName());

        int result = arithmeticCalculator.add(1,2);
        System.out.println("result:"+result);

        result = arithmeticCalculator.div(1000,20);
        System.out.println("result:"+result);
    }
}

執行結果