基于配置文件的方式来配置 AOP

接口类：

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);
	
}

实现类：

package com.spring.aop.xml;


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;
	}

}

切面类：

package com.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()));
	}
	
}

切面类2：

package com.spring.aop.xml;

import java.util.Arrays;

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

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);
	}
	
	@Around("execution(public int com.spring.aop.ArithmeticCalculator.*(..))")
	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;
	}
}

测试类：

package com.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("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(1000,0);
		System.out.println("result:" + result);
	}
	
}

配置文件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-4.0.xsd">

	<!-- 配置 bean -->
	<bean id="arithmeticCalculator" 
		class="comspring.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>
		<!-- 配置切点表达式 -->
		<aop:pointcut expression="execution(* com.spring.aop.xml.ArithmeticCalculator.*(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>

基于配置文件的方式来配置 AOP

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