spring的第一个AOP实例

面向切面编程，要理解很多概念，如切面，连接点，通知，切入点。。。
此时新建的项目不仅要添加spring的核心包（即core），还有添加AOP功能的jar包
然后创建bean类
先创建接口

package com.sun.springaop.test;

public interface IBean {
public void theMethod();
}

然后创建实现类

package com.sun.springaop.test;

public class BeanImpl implements IBean {

	@Override
	public void theMethod() {

		System.out.println(this.getClass().getName()+"."+new Exception().getStackTrace()[0].getMethodName()+"()"+" 正在被执行");
	}

}

创建前置通知类，即在操作前执行的功能

package com.sun.springaop.test;

import java.lang.reflect.Method;

import org.springframework.aop.MethodBeforeAdvice;

public class TestBeforeAdvice implements MethodBeforeAdvice {

//	参数method表示具体连接点，args表示目标对象方法的参数，target返回该方法所属的目标对象
	
	@Override
	public void before(Method m, Object[] args, Object target)
			throws Throwable {

		System.out.println("执行前置通知");
	}

}

在配置文件中，进行拦截器和bean的配置
完整的配置文件如下：

<?xml version="1.0" encoding="UTF-8"?>
<beans
	xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">

<!-- 定义代理 -->
	<bean id="bean"
		class="org.springframework.aop.framework.ProxyFactoryBean"
		abstract="false" lazy-init="default" autowire="default"
		dependency-check="default">
		<property name="proxyInterfaces">
			<value>com.sun.springaop.test.IBean</value>
		</property>
		<property name="target">
			<ref local="beanTarget" />
		</property>
		<property name="interceptorNames">
			<list>
				<value>theAdvisor</value>
			</list>
		</property>
	</bean>
	<!-- 注入对象 -->
	<bean id="beanTarget" class="com.sun.springaop.test.BeanImpl"
		abstract="false" lazy-init="default" autowire="default"
		dependency-check="default">
	</bean>
	
	<!-- 使用正则表达式方式定义切入点 -->
	<bean id="theAdvisor"
		class="org.springframework.aop.support.RegexpMethodPointcutAdvisor"
		abstract="false" lazy-init="default" autowire="default"
		dependency-check="default">
		<property name="advice">
			<ref local="theBeforeAdvice" />
		</property>
		<property name="pattern">
			<value>com\.sun\.springaop\.test\.IBean\.theMethod</value>
		</property>
	</bean>
	<!-- 定义前置通知 -->
	<bean id="theBeforeAdvice"
		class="com.sun.springaop.test.TestBeforeAdvice" abstract="false"
		lazy-init="default" autowire="default" dependency-check="default">
	</bean></beans>

测试类：

package com.sun.springaop.test;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;


public class Client {

	public static void main(String[] args) {
		BeanFactory factory = new XmlBeanFactory(new ClassPathResource("applicationContext.xml"));
		IBean x = (IBean) factory.getBean("bean");
		x.theMethod();
		
	}

}

执行结果：
执行前置通知
com.sun.springaop.test.BeanImpl.theMethod() 正在被执行