Spring中AOP源码剖析

一、环境准备

1 bean和接口

public class AopBean implements AopBeanInfo{

	@Override
	public void test() {
		System.out.println("spring aop test... ...");
	}
}

public interface AopBeanInfo {
	public void test();
}

2 横切逻辑

/**
 *
 */
public class LogUtils {

	/**
	 * 前置通知
	 */
	public void beforeMethod() {
		System.out.println("前置通知");
	}


	/**
	 * 最终通知
	 */
	public void alertMethod(){
		System.out.println("最终通知");
	}

	/**
	 * 环绕通知
	 * @param pjp
	 * @return
	 * @throws Throwable
	 */
	public Object aroundMethod(ProceedingJoinPoint pjp) throws Throwable{
		System.out.println("环绕通知-pre");
		Object proceed = pjp.proceed();
		System.out.println("环绕通知-after");
		return proceed;
	}

	/**
	 * 异常通知
	 */
	public void afterThrowingMethod(){
		System.out.println("异常通知");
	}

	/**
	 * 后置通知
	 */
	public void afterReturning(){
		System.out.println("后置通知");
	}

}

3 配置文件：

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

	<!--循环依赖问题-->
	<bean id="aopBean" class="com.dabing.source.aop.AopBean"></bean>


	<!--aop配置-->
	<!--横切逻辑-->
	<bean id="logUtils" class="com.dabing.source.aop.LogUtils"></bean>

	<aop:config>
		<aop:aspect ref="logUtils">
			<aop:before method="beforeMethod" pointcut="execution(public void com.dabing.source.aop.AopBean.test())"/>
			<aop:after method="alertMethod" pointcut="execution(public void com.dabing.source.aop.AopBean.test())"/>
			<aop:around method="aroundMethod" pointcut="execution(public void com.dabing.source.aop.AopBean.test())"/>
			<aop:after-returning method="afterReturning" pointcut="execution(public void com.dabing.source.aop.AopBean.test())"/>
			<aop:after-throwing method="afterThrowingMethod" pointcut="execution(public void com.dabing.source.aop.AopBean.test())"/>

		</aop:aspect>
	</aop:config>


</beans>

4 测试类：

	/**
	 * 测试aop
	 */
	@Test
	public void testAop(){
		ApplicationContext applicationContext = new ClassPathXmlApplicationContext("classpath:applicationContext-aop.xml");
		AopBeanInfo aopBean = applicationContext.getBean(AopBeanInfo.class);
		aopBean.test();
	}