Spring AOP簡易實踐

首當其衝，配置文件：

<?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:context="http://www.springframework.org/schema/context"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
				http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd
				http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd">
	<!-- AOP配置流程
		 一、配置被代理對象 
		 二、前置通知
		 三、代理對象 -->
	
	<!-- 被代理對象 -->
	<bean id="testservice1" class="com.pas.service.TestService1">
		<property name="name" value="ping" />
	</bean>
	<bean id="testservice2" class="com.pas.service.TestService2">
		<property name="name" value="ping" />
	</bean>
	<!-- 前置通知 -->
	<bean id="beforeadvice" class="com.pas.notify.BeforeAdvice" />
	<!-- 後置通知 -->
	<bean id="afteradvice" class="com.pas.notify.AfterAdvice" />
	<!-- 環繞通知 -->
	<bean id="aroundadvice" class="com.pas.notify.AroundAdvice"/>
	<!-- 異常通知 -->
	<bean id="throwadvice" class="com.pas.notify.ThrowsAdvice"/>
	
	<!-- 引入通知 過濾通知中的某些切入點 -->
	<bean id="myBeforeAdviceFilter" class="org.springframework.aop.support.NameMatchMethodPointcutAdvisor">
		<!-- 針對的通知bean -->
		<property name="advice" ref="beforeadvice"/>
		<property name="mappedNames">
		<!-- 只對如下方法名織入 -->
			<list>
			<!-- 名稱也可使用正則過濾 -->
				<value>sayHello</value>
			</list>
		</property>
	</bean>
	<!-- 代理對象 -->
	<bean id="myproxy" class="org.springframework.aop.framework.ProxyFactoryBean">
		
		<!-- 代理接口集 -->
		<property name="proxyInterfaces">
			<list>
				<value>com.pas.inter.TestServiceInter</value>
				<value>com.pas.inter.TestServiceInter2</value>
			</list>
		</property>

	<!-- 織入通知到代理對象 -->
	<property name="interceptorNames">
		<list>
			<!-- 此處引用的是自定義的鏈接點過濾器id -->
			<value>myBeforeAdviceFilter</value>
			<value>afteradvice</value>
			<value>aroundadvice</value>
			<value>throwadvice</value>
		</list>
	</property>

	<!-- 配置被代理對象 -->
	<property name="target">
		<!-- 通知只對被代理對象有效 -->
		<ref bean="testservice1" />
	</property>
	</bean>
</beans>

通知：

/*
 * 前置通知類
 */
public class BeforeAdvice implements MethodBeforeAdvice {

	/*
	 * method:被調用的方法
	 * args:method接收到的參數
	 * target:目標對象
	 */
	@Override
	public void before(Method method, Object[] args, Object target)
			throws Throwable {
		System.out.println("前置通知-寫入日誌");
	}

}

/*
 * 後置通知
 */
public class AfterAdvice implements AfterReturningAdvice {

	@Override
	public void afterReturning(Object returnValue, Method method,
			Object[] args, Object target) throws Throwable {
		System.out.println("後置通知-事務提交");
	}
}

/*
 * 環繞通知
 */
public class AroundAdvice implements MethodInterceptor {

	/*
	 * 執行在函數體內，具體內容調用以前
	 * @see org.aopalliance.intercept.MethodInterceptor#invoke(org.aopalliance.intercept.MethodInvocation)
	 */
	@Override
	public Object invoke(MethodInvocation arg0) throws Throwable {
		// TODO Auto-generated method stub
		System.out.println("環繞通知-調用方法前");
		Object o=arg0.proceed();
		System.out.println("環繞通知-調用方法後");
		return o;
	}
}

/*
 * 異常通知
 */
public class ThrowsAdvice implements org.springframework.aop.ThrowsAdvice {
	
	public void afterThrowing(Method m,Object[] os,Object
	target,Exception throwable)
	{
		System.out.println("異常通知-出事了"+throwable.getMessage());
	}

}

測試：

public class Test {
	public static void main(String[] args) {

		ApplicationContext ac = ApplicationContextUtil.getApplicationContext();
		//取代理對象的id
		TestServiceInter2 t=(TestServiceInter2) ac.getBean("myproxy");
//		((TestServiceInter)t).sayHello();
//		((TestServiceInter)t).sayHi();
		t.sayBye();
	}
}

console：

sayHello：

前置通知-寫入日誌
環繞通知-調用方法前
Hello：TestService1
環繞通知-調用方法後
後置通知-事務提交

SayBye測試異常:
環繞通知-調用方法前
bye:ping
異常通知-出事了/ by zero
Exception in thread "main" java.lang.ArithmeticException: / by zero
……