环绕通知

环绕通知

* 方法的执行前后执行。
* 配置文件信息：

<aop:around method="around" pointcut-ref="myPointcut2"/>

需求：利用环绕通知来模拟业务层方法做事务管理。

一、编写业务类

CustomerService：

package com.yiidian.service;
/**
 * @author http://www.yiidian.com
 *
 */
public interface CustomerService {

	public void save(String name);
	
	public void update();
}

CustomerServiceImpl：

package com.yiidian.service.impl;

import com.yiidian.service.CustomerService;
/**
 * 这个类在AOP属于目标对象（Target)
 * @author http://www.yiidian.com
 *
 */
public class CustomerServiceImpl implements CustomerService {

	@Override
	public void save(String name) {
		System.out.println("执行save方法,name为："+name);
	}

	@Override
	public void update() {
		System.out.println("执行update方法");
	}

}

二、编写切面类，添加环绕通知方法

package com.yiidian.aspect;

import org.aspectj.lang.ProceedingJoinPoint;

/**
 * Spring的AOP的切面类
 * @author http://www.yiidian.com
 *
 */
public class MyAspect {

	/**
	 * 环绕通知
	 * ProceedingJoinPoint:
	 */
	public void afterThrowing(ProceedingJoinPoint pjp){
		System.out.println("开启事务");
		//调用目标对象方法
		try {
			pjp.proceed();
		} catch (Throwable e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		System.out.println("提交事务");
	}

}

三、配置applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:p="http://www.springframework.org/schema/p"
	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 
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop.xsd">

	<!-- 基于AspectJ的spring的AOP编写之XML方式 -->
	
	<!-- 1.创建目标对象 -->
	<bean id="customerService" class="com.yiidian.service.impl.CustomerServiceImpl"/>
	
	<!-- 2.创建切面类对象 -->
	<bean id="myAspect" class="com.yiidian.aspect.MyAspect"/>
	
	<!-- 3.配置AOP切面 -->
	<aop:config>
		<!-- 切面 = 通知+切入点 -->
		<aop:aspect ref="myAspect">
			<!-- 
				aop:around:这个是环绕通知配置
			 -->
			<aop:around method="afterThrowing" pointcut-ref="pt"></aop:around>
			<aop:pointcut expression="execution(public * com.yiidian.service.impl.CustomerServiceImpl.*(..))" id="pt"/>
		</aop:aspect>
	</aop:config>
	
</beans>

 四、编写测试类

package com.yiidian.test;

import javax.annotation.Resource;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import com.yiidian.service.CustomerService;
/**
 * @author http://www.yiidian.com
 *
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class Demo1 {

	@Resource
	private CustomerService customerService;
	
	@Test
	public void test1(){
		customerService.update();
	}
}

五、运行结果

源码下载：http://pan.baidu.com/s/1c1MLThY