spring AOP (使用AspectJ的xml方式 的aop实现) (7)

目录

• 一、定义计算器接口跟实现类
• 二、定义两个切面，日志切面和验证切面
• 三、在xml中配置切面
• 四、测试类

一、定义计算器接口跟实现类

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);
}

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;
    }
}

二、定义两个切面，日志切面和验证切面

• 日志:

package com.hp.spring.aop.xml;
import java.util.Arrays;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
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 excetion:" + e);
    }

    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;
    }
}

• 验证:

package com.hp.spring.aop.xml;
import java.util.Arrays;
import org.aspectj.lang.JoinPoint;
public class VlidationAspect {
    public void validateArgs(JoinPoint joinPoint){
        System.out.println("-->validate:" + Arrays.asList(joinPoint.getArgs()));
    }

}

三、在xml中配置切面

<?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-4.0.xsd">
    <!-- 配置 bean -->
    <bean id="arithmeticCalculator"
        class="com.hp.spring.aop.xml.ArithmeticCalculatorImpl"></bean>
    <!-- 配置切面的 bean. -->
    <bean id="loggingAspect"
        class="com.hp.spring.aop.xml.LoggingAspect"></bean>
    <bean id="vlidationAspect"
        class="com.hp.spring.aop.xml.VlidationAspect"></bean>
    <!-- 配置 AOP -->
    <aop:config>
        <!-- 配置切点表达式 -->
        <aop:pointcut expression="execution(* com.hp.spring.aop.xml.ArithmeticCalculator.*(..))"
            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>

四、测试类

package com.hp.spring.aop.xml;

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

public class Main {

	public static void main(String[] args) {

		ApplicationContext ctx = new ClassPathXmlApplicationContext("beans-aspectj-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, 0);//这里故意除以0 让程序出错，让切面得到异常通知
		System.out.println("result:" + result);
	}

}

打印出：

com.sun.proxy.$Proxy2

-->validate:[1, 2]

The method add begins with [1, 2]

The method add ends

The method add ends with 3

result:3

-->validate:[1000, 0]

The method div begins with [1000, 0]

The method div ends

The method div occurs excetion:java.lang.ArithmeticException: / by zero

Exception in thread "main" java.lang.ArithmeticException: / by zero

at com.hp.spring.aop.xml.ArithmeticCalculatorImpl.div(ArithmeticCalculatorImpl.java:25)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

...

整个系列项目代码： http://git.oschina.net/nmc5/spring