spring aop注解配置代碼實(shí)例

package cn.itcast.e_annotation;


import javax.annotation.Resource;

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

import cn.itcast.bean.User;
import cn.itcast.service.ISUserService;
@RunWith(SpringJUnit4ClassRunner.class)//幫我們創(chuàng)建容器
//指定創(chuàng)建容器時(shí)使用哪個(gè)配置文件
@ContextConfiguration("classpath:cn/itcast/e_annotation/applicationContext.xml")
public class Demo {
	/*
	 * @Test public void fun1() { //1 創(chuàng)建容器對(duì)象 ClassPathXmlApplicationContext ac=new
	 * ClassPathXmlApplicationContext("applicationContext.xml"); //2 向容器“要” user對(duì)象
	 * User u=(User)ac.getBean("user"); User u2=(User)ac.getBean("user");
	 * 
	 * System.out.println(u==u2); //3 打印user對(duì)象 System.out.println(u);
	 * 
	 * ac.close(); }
	 */
	@Resource(name="userServiceTarget")
	private ISUserService us;
	
	@Test
	public void fun1() {
		us.save();
	}
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.2.xsd ">
	<!-- 準(zhǔn)備工作：導(dǎo)入aop（約束）命名空間 -->
	<!-- 1. 配置目標(biāo)對(duì)象 -->
	<bean name="userServiceTarget" class="cn.itcast.service.UserServiceImpl"></bean>
	<!-- 2. 配置通知對(duì)象 -->
	<bean name="myAdvice" class="cn.itcast.e_annotation.MyAdvice"></bean>
	<!-- 3. 開啟使用注解完成植入 -->
	<aop:aspectj-autoproxy></aop:aspectj-autoproxy>
</beans>

package cn.itcast.e_annotation;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;

//通知類
@Aspect//表示該類時(shí)一個(gè)通知類
public class MyAdvice {
	//前置通知 -》目標(biāo)方法運(yùn)行之前調(diào)用
	//后置通知（如果出現(xiàn)異常不會(huì)調(diào)用） -》目標(biāo)方法運(yùn)行之后調(diào)用
	//環(huán)繞通知-》在目標(biāo)方法之前和之后都調(diào)用
	//異常攔截通知-》如果出現(xiàn)異常，就會(huì)調(diào)用
	//后置通知（無(wú)論是否出現(xiàn)異常都會(huì)調(diào)用）-》在目標(biāo)方法運(yùn)行之后調(diào)用
	@Pointcut("execution(* cn.itcast.service.*ServiceImpl.*(..))")
	public void pc() {}
	
	//前置通知
	@Before("MyAdvice.pc()")//指定該方法是前置切點(diǎn)
	public void before() {
		System.out.println("這是前置通知");
	}
	//后置通知
	public void afterReturning() {
		System.out.println("這是后置通知（如果出現(xiàn)異常不會(huì)調(diào)用！?。?);
	}
	//環(huán)繞通知
	public Object around( ProceedingJoinPoint pjp) throws Throwable {
		System.out.println("這是環(huán)繞通知之前的部分");
		Object procees=pjp.proceed();//調(diào)用目標(biāo)方法
		System.out.println("這是環(huán)繞通知之后的部分");
		return procees;
	}
	//異常通知
	public void afterException() {
		System.out.println("出事了，出現(xiàn)異常了");
	}
	//后置通知
	public void after() {
		System.out.println("這是后置通知（出現(xiàn)異常也會(huì)調(diào)用）");
	}
}